AHMANSON H F & CO /DE/
POS AM, 1998-01-13
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 13, 1998.
    
   
                                                      REGISTRATION NO. 333-41645
    
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                 POST-EFFECTIVE
    
   
                               AMENDMENT NO. 1 TO
    
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                            H. F. AHMANSON & COMPANY
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                            <C>                            <C>
           DELAWARE                         6035                        95-0479700
 (STATE OR OTHER JURISDICTION   (PRIMARY STANDARD INDUSTRIAL         (I.R.S. EMPLOYER
       OF INCORPORATION)          CLASSIFICATION CODE NO.)          IDENTIFICATION NO.)
</TABLE>
 
                              4900 RIVERGRADE ROAD
                          IRWINDALE, CALIFORNIA 91706
                                 (626) 960-6311
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                              MADELEINE A. KLEINER
              SENIOR EXECUTIVE VICE PRESIDENT AND GENERAL COUNSEL
                            H. F. AHMANSON & COMPANY
                              4900 RIVERGRADE ROAD
                          IRWINDALE, CALIFORNIA 91706
                                 (626) 960-6311
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                            ------------------------
 
                                WITH COPIES TO:
 
<TABLE>
<S>                                 <C>                           <C>
         ALISON S. RESSLER                                                  VICTOR I. LEWKOW
        SULLIVAN & CROMWELL                                        CLEARY, GOTTLIEB, STEEN & HAMILTON
      444 SOUTH FLOWER STREET                    AND                       ONE LIBERTY PLAZA
   LOS ANGELES, CALIFORNIA 90071                                        NEW YORK, NEW YORK 10006
           (213) 955-8000                                                    (212) 225-2000
</TABLE>
 
 APPROXIMATE DATE OF COMMENCEMENT OF THE PROPOSED SALE OF THE SECURITIES TO THE
                                    PUBLIC:
  As soon as practicable after this Registration Statement becomes effective.
 
   
     If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G check the following box.  [ ]
    
 
   
- --------------------------------------------------------------------------------
    
- --------------------------------------------------------------------------------
<PAGE>   2
 
                                      LOGO
 
   
                                                                January   , 1998
    
 
Dear Stockholder:
 
   
     It is my pleasure to invite you to attend a Special Meeting of Stockholders
of Coast Savings Financial, Inc. ("Coast") to be held on February   , 1998, at
   a.m., at the OMNI Hotel, 930 Wilshire Boulevard, Los Angeles, California.
    
 
     At this very important meeting, Coast stockholders will be asked to
consider and vote upon a proposal to approve the Amended and Restated Agreement
and Plan of Merger (the "Merger Agreement"), dated as of October 5, 1997, by and
between Coast and H. F. Ahmanson & Company, a Delaware corporation ("Ahmanson"),
and the transactions contemplated thereby, including the merger (the "Merger")
of Coast with and into Ahmanson.
 
   
     If the Merger is approved and consummated, each share of Coast common stock
will be converted into the right to receive 0.8082 of a share of Ahmanson common
stock. In addition, immediately prior to the Merger each Coast stockholder will
receive one Contingent Payment Right Certificate (a "CPR Certificate") for each
of their shares of Coast common stock. The CPR Certificates will be issued by
the newly-formed Coast Federal Litigation Contingent Payment Rights Trust (the
"CPR Trust"). Upon consummation of the Merger, Ahmanson will be contractually
bound to pay to the CPR Trust, for the benefit of the holders of CPR
Certificates, an amount equal to any proceeds (net of taxes and expenses,
computed under certain assumptions as described in the accompanying Proxy
Statement/Prospectus), that Coast Federal Bank, FSB ("Coast Federal") (or its
successors) may receive from its pending litigation claims against the United
States government relating to the government's alleged breach of its agreement
with respect to the permanent addition of approximately $299 million to Coast
Federal's regulatory capital. Thus, in connection with the Merger you will both
receive Ahmanson common stock and retain an indirect proportionate interest in
our litigation claims against the government. The CPR Certificates will be
transferable, and Coast, on behalf of the CPR Trust, has applied for inclusion
of the CPR Certificates on the NASDAQ National Market System. No assurance can
be given that the CPR Certificates will satisfy the listing requirements for
inclusion on the NASDAQ National Market System or any other trading system. In
the event that the CPR Certificates cannot be listed on any trading system,
there would likely be only minimal or no trading channels for the CPR
Certificates, resulting in severely reduced or no liquidity for investors in the
CPR Certificates. Even if such listing is achieved, there can be no assurance
that an active market for the CPR Certificates will develop or be sustained. If
such a market develops, there can be no assurance as to the price at which the
CPR Certificates would trade at any time and such price could be subject to
rapid and substantial change, depending upon, among other things, developments
in such pending litigation claims and similar pending litigation. The CPR
Certificates are highly speculative securities that involve a high degree of
risk.
    
 
     THE BOARD OF DIRECTORS OF COAST (THE "COAST BOARD") HAS UNANIMOUSLY
APPROVED THE MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY, AND
BELIEVES THAT THE MERGER IS IN THE BEST INTERESTS OF COAST AND ITS STOCKHOLDERS.
THE COAST BOARD RECOMMENDS THAT ALL STOCKHOLDERS VOTE "FOR" THE MERGER PROPOSAL.
Coast's financial advisor, Goldman Sachs & Co., has issued its written opinion
to the Coast Board of Directors that the consideration to be received by holders
of Coast common stock pursuant to the Merger Agreement is fair from a financial
point of view to Coast stockholders.
 
     COAST STOCKHOLDERS ARE URGED TO READ CAREFULLY THE ACCOMPANYING NOTICE OF
SPECIAL MEETING AND PROXY STATEMENT/PROSPECTUS, WHICH CONTAIN IMPORTANT
INFORMATION ABOUT THE MERGER AND THE OTHER TRANSACTIONS CONTEMPLATED BY THE
MERGER AGREEMENT, INCLUDING IMPORTANT INFORMATION CONCERNING THE CPR TRUST AND
THE CPR CERTIFICATES. A COPY OF THE OPINION OF GOLDMAN, SACHS & CO. IS ATTACHED
AS APPENDIX D TO THE PROXY STATEMENT/PROSPECTUS ENCLOSED HEREWITH AND SHOULD BE
READ IN ITS ENTIRETY.
<PAGE>   3
 
     Regardless of the number of shares you own, or whether you plan to attend
the meeting, it is very important that your shares be represented and voted at
the meeting. Since the affirmative vote of a majority of the outstanding shares
is required for approval of the Merger Agreement and the transactions
contemplated thereby, a failure to vote is the same as a vote against the
Merger. Please read the enclosed material carefully and complete, sign and
return the enclosed proxy in the envelope provided as soon as possible.
 
     On behalf of the Coast Board of Directors, I thank you for your support and
again urge you to vote FOR the approval and adoption of the Merger Agreement and
the transactions contemplated thereby.
 
                                          Sincerely,
 
   
                                          /s/ RAY MARTIN
    
 
                                          Ray Martin
                                          Chairman of the Board and
                                          Chief Executive Officer
<PAGE>   4
 
                         COAST SAVINGS FINANCIAL, INC.
                            1000 WILSHIRE BOULEVARD
                       LOS ANGELES, CALIFORNIA 90017-2457
 
                            ------------------------
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
   
                        TO BE HELD ON FEBRUARY   , 1998
    
 
   
     Notice is hereby given that a Special Meeting of stockholders (the "Special
Meeting") of Coast Savings Financial, Inc. ("Coast") will be held on February
  , 1998 at   a.m., at the OMNI Hotel, 930 Wilshire Boulevard, Los Angeles,
California, for the following purposes, as more fully described in the
accompanying Proxy Statement/Prospectus:
    
 
   
          1. To consider and vote upon a proposal to approve an Amended and
     Restated Agreement and Plan of Merger (the "Merger Agreement"), dated as of
     October 5, 1997, between Coast and H. F. Ahmanson & Company, a Delaware
     corporation ("Ahmanson"), and the transactions contemplated thereby,
     including the approval of the merger of Coast with and into Ahmanson (the
     "Merger"), the establishment of and the terms of the Coast Federal
     Litigation Contingent Payment Rights Trust (the "CPR Trust"), the CPR
     Certificate Distribution (as defined in the accompanying Proxy
     Statement/Prospectus), the engagement of the Litigation Trustees (as
     defined in the accompanying Proxy Statement/Prospectus) (including the
     terms of their engagement), the terms of the Commitment (as defined in the
     accompanying Proxy Statement/Prospectus) and the rights of the holders of
     CPR Certificates (as defined in the accompanying Proxy
     Statement/Prospectus) (collectively, the "Transaction Proposal"). The
     Merger Agreement, the Amended and Restated Declaration of Trust governing
     the CPR Trust and the Commitment will be substantially in the form of
     Appendices A, B and C, respectively, to the accompanying Proxy
     Statement/Prospectus.
    
 
          2. To transact such other business as may properly come before the
     Special Meeting or any adjournment or postponement thereof.
 
   
     Only holders of Coast common stock of record at the close of business on
December 23, 1997 are entitled to receive notice of and to vote at the Special
Meeting or any adjournment or postponement thereof.
    
 
   
     THE BOARD OF DIRECTORS OF COAST UNANIMOUSLY RECOMMENDS THAT STOCKHOLDERS
VOTE "FOR" APPROVAL OF THE TRANSACTION PROPOSAL.
    
 
     Holders of Coast common stock who do not vote in favor of the Transaction
Proposal will be entitled to dissenters' rights of appraisal under Section 262
of the Delaware General Corporations Law. For a more complete description of
such dissenters' rights, see "Appraisal Rights" in the accompanying Proxy
Statement/Prospectus.
 
                                          By order of the Board of Directors,
 
                                          LOGO
   
                                          Brockton Hill
    
                                          Corporate Secretary
 
   
January   , 1998
    
 
THE APPROVAL OF THE TRANSACTION PROPOSAL REQUIRES THE AFFIRMATIVE VOTE OF A
MAJORITY OF THE ISSUED AND OUTSTANDING SHARES OF COAST COMMON STOCK. THEREFORE,
FAILURE TO VOTE WILL HAVE THE SAME EFFECT AS A VOTE AGAINST THE TRANSACTION
PROPOSAL. WHETHER OR NOT YOU PLAN TO ATTEND THE COAST SPECIAL MEETING, PLEASE
COMPLETE, SIGN AND DATE THE ENCLOSED PROXY CARD AND MAIL IT PROMPTLY IN THE
ENCLOSED RETURN ENVELOPE, WHICH REQUIRES NO POSTAGE IF MAILED IN THE UNITED
STATES. IF YOU ATTEND THE COAST SPECIAL MEETING, YOU MAY VOTE IN PERSON IF YOU
WISH TO DO SO EVEN IF YOU HAVE PREVIOUSLY SENT IN YOUR PROXY CARD.
<PAGE>   5
 
                PROXY STATEMENT OF COAST SAVINGS FINANCIAL, INC.
 
   
                                 PROSPECTUS OF
    
   
                            H. F. AHMANSON & COMPANY
    
 
   
                                  COMMON STOCK
    
   
                           (PAR VALUE $.01 PER SHARE)
    
 
   
                            ------------------------
    
 
   
     This Proxy Statement/Prospectus is being furnished to holders of common
stock, $.01 par value ("Coast Common Stock"), of Coast Savings Financial, Inc.,
a Delaware corporation ("Coast"), in connection with the solicitation of proxies
by the Board of Directors of Coast (the "Coast Board") for use at a Special
Meeting of stockholders to be held on February   , 1998, at   a.m., at the OMNI
Hotel, 930 Wilshire Boulevard, Los Angeles, California and at any adjournments
or postponements thereof (the "Special Meeting").
    
 
   
     The purpose of the Special Meeting is to consider and vote upon a proposal
to approve an Amended and Restated Agreement and Plan of Merger, dated as of
October 5, 1997 (the "Merger Agreement"), by and between Coast and H. F.
Ahmanson & Company, a Delaware corporation ("Ahmanson"), and the transactions
contemplated thereby, including the approval of the merger of Coast with and
into Ahmanson (the "Merger"), the establishment of and the terms of a trust to
be known as the Coast Federal Litigation Contingent Payment Rights Trust (the
"CPR Trust"), the CPR Certificate Distribution (as defined herein), the
engagement of the Litigation Trustees (as defined herein) (including the terms
of their engagement) for the CPR Trust, the terms of the Commitment (as defined
herein) and the rights of the holders of CPR Certificates (as defined herein).
See "Summary," "The Merger," "The CPR Trust and the CPR Certificates" and
Appendices A and C to this Proxy Statement/Prospectus.
    
 
   
     Upon consummation of the Merger, each outstanding share of Coast Common
Stock, together with each associated Coast Right (as defined herein), shall
cease to be outstanding and each such share (other than (a) certain shares, if
any, held by Coast, Ahmanson or their subsidiaries and (b) shares, if any, held
by holders of Coast Common Stock ("Dissenters' Shares") who perfect their rights
to dissent from the Merger) will be converted into and exchanged for 0.8082 of a
share (the "Exchange Ratio") of common stock, par value $.01 per share, of
Ahmanson ("Ahmanson Common Stock") (together with the appropriate number of
Ahmanson stock purchase rights ("Ahmanson Rights") issued as provided in the
Ahmanson Rights Plan (as defined herein)), with cash paid in lieu of fractional
shares. In addition, and as additional consideration to be received by the Coast
stockholders in the Merger, at the Effective Time (as defined herein), Ahmanson
will enter into the Commitment with the CPR Trust. See "The Merger."
    
 
   
     Pursuant to the Merger Agreement, at the Effective Time, Ahmanson will
enter into a contractual commitment (the "Commitment") with the CPR Trust
pursuant to which Ahmanson will be obligated to pay to the CPR Trust from time
to time an aggregate amount equal to the Commitment Amount. Generally, the
Commitment Amount is an amount equal to the proceeds, if any, received by
Ahmanson, Coast's subsidiary, Coast Federal Savings, FSB ("Coast Federal"), or
Ahmanson's subsidiary, Home Savings of America, FSB ("Home Savings") (or any
other successor), as a result of the Litigation (as defined herein), net of
assumed tax liabilities attributable to such receipt (calculated on certain
assumptions described herein), certain expenses and interest, plus the amount of
certain assumed tax benefits (calculated on certain assumptions described
herein) to Ahmanson, if any, associated with payments of the Commitment Amount,
all as more fully described herein. See "The Merger -- Merger Consideration;
Exchange Ratio; Commitment." The Commitment will rank pari passu with other
senior indebtedness of Ahmanson. The case brought by Coast Federal against the
United States government relating to the federal government's alleged breach of
the agreement entered into in 1987, in connection with Coast Federal's
acquisition of Central Savings and Loan Association to treat certain amounts as
a permanent addition to Coast Federal's regulatory capital (the
    
 
   
                                                    (continued on the next page)
    
<PAGE>   6
 
   
(cover page continues)
    
 
   
"Litigation"), will remain a contingent asset of Coast Federal upon
effectiveness of the Merger and thus will become a contingent asset of Ahmanson
as successor to Coast and as parent company of Coast Federal.
    
 
   
     This Proxy Statement/Prospectus also constitutes a prospectus of Ahmanson
in respect of the shares of Ahmanson Common Stock to be issued to stockholders
of Coast in connection with the Merger and, following consummation of the
Merger, in respect of any shares of Ahmanson Common Stock that are issuable upon
exercise of Replacement Options (as defined herein). Based on the 19,262,934
shares of Coast Common Stock outstanding on the Record Date (as defined herein),
the 1,020,426 shares of Coast Common Stock issuable upon exercise of outstanding
stock options and assuming the exercise of all such stock options prior to the
Effective Time and the Exchange Ratio of 0.8082, up to approximately 16,393,012
shares of Ahmanson Common Stock will be issuable upon consummation of the
Merger.
    
 
   
     Both the Ahmanson Common Stock and the Coast Common Stock are listed and
traded on the New York Stock Exchange, Inc. ("NYSE") and the Pacific Exchange.
On October 3, 1997, the last business day prior to public announcement of the
execution of the Merger Agreement, the last reported sale prices per share of
Ahmanson Common Stock and Coast Common Stock on the NYSE Composite Transactions
Reporting System (the "NYSE Composite Tape") were $57 1/8 and $54, respectively,
and on January 12, 1998, the latest practicable date prior to the mailing of
this Proxy Statement/Prospectus, such last reported sale prices per share were
$          and $          , respectively.
    
 
   
  THE SHARES OF AHMANSON COMMON STOCK OFFERED HEREBY HAVE NOT BEEN APPROVED OR
 DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
    COMMISSION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
    SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROXY
STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
    
                            ------------------------
 
   
  THE SHARES OF AHMANSON COMMON STOCK OFFERED HEREBY ARE NOT SAVINGS ACCOUNTS,
   DEPOSITS OR OTHER OBLIGATIONS OF A BANK OR SAVINGS ASSOCIATION AND ARE NOT
 INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL
                                    AGENCY.
    
                            ------------------------
 
   
     The date of this Proxy Statement/Prospectus is January   , 1998, and it is
first being mailed or otherwise delivered to Coast stockholders on or about such
date.
    
<PAGE>   7
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
AVAILABLE INFORMATION.................................................................    3
 
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE.....................................    5
 
SUMMARY...............................................................................    7
  Parties to the Merger...............................................................    7
  Special Meeting; Record Date........................................................    7
  The Merger..........................................................................    8
  Market for Common Stock.............................................................   13
  Comparison of Certain Unaudited per Share Data......................................   14
  Selected Consolidated Financial Data of Ahmanson (Historical).......................   16
  Selected Consolidated Financial Data of Coast (Historical)..........................   18
  Selected Unaudited Pro Forma Combined Financial Data................................   19
 
GENERAL INFORMATION...................................................................   20
  Special Meeting.....................................................................   20
  Record Date, Solicitation and Revocability of Proxies...............................   20
  Vote Required.......................................................................   21
  Recommendation of Coast Board of Directors..........................................   21
THE MERGER............................................................................   22
  General.............................................................................   22
  Merger Consideration; Exchange Ratio; Commitment....................................   22
  Background of the Merger............................................................   28
  Reasons of Coast for the Merger.....................................................   30
  Opinion of Coast's Financial Advisor................................................   32
  Reasons of Ahmanson for the Merger..................................................   37
  Effective Time......................................................................   37
  Distribution of Ahmanson Common Stock Certificates..................................   37
  Distribution of the CPR Certificates................................................   38
  Fractional Shares...................................................................   38
  The CPR Trust, the CPR Certificates and the CPR Certificate Distribution............   38
  Stock Options; Performance Share Awards; SARs.......................................   38
  Certain Federal Income Tax Consequences.............................................   39
  Management and Operations After the Merger..........................................   41
  Post-Acquisition Compensation and Benefits..........................................   42
  Interests of Certain Persons in the Transaction Proposal............................   42
  Conditions to Consummation..........................................................   46
  Regulatory Approvals................................................................   47
  Amendment and Waiver................................................................   47
  Termination; Termination Fee........................................................   48
  Conduct of Business Pending the Merger..............................................   48
  Expenses and Fees...................................................................   50
  Accounting Treatment................................................................   50
  Stock Exchange Listing of Ahmanson Common Stock.....................................   51
  Resales of Ahmanson Common Stock....................................................   51
  Acquisition Proposals...............................................................   51
  Earnings Estimates..................................................................   52
</TABLE>
    
 
                                        i
<PAGE>   8
 
   
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
 
APPRAISAL RIGHTS......................................................................   52
 
AHMANSON AND COAST UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION.................   55
 
DESCRIPTION OF AHMANSON CAPITAL STOCK.................................................   64
  Ahmanson Common Stock...............................................................   64
  Repurchases of Ahmanson Common Stock................................................   64
  Ahmanson Preferred Stock............................................................   64
  Certain Regulatory Considerations...................................................   66
 
CERTAIN DIFFERENCES IN THE RIGHTS OF AHMANSON STOCKHOLDERS AND COAST STOCKHOLDERS.....   72
  Meetings of Stockholders............................................................   72
  Number and Election of Directors....................................................   72
  Indemnification.....................................................................   73
  Certain Voting Rights...............................................................   73
  Removal of Directors; Filling Vacancies on the Board of Directors...................   74
  Stockholder Action by Written Consent...............................................   74
  Amendment of By-laws................................................................   74
  Rights Plans........................................................................   74
 
COMPARATIVE MARKET PRICES AND DIVIDENDS...............................................   76
  Ahmanson............................................................................   76
  Coast...............................................................................   77
 
VOTING SECURITIES AND PRINCIPAL STOCKHOLDERS OF COAST.................................   78
  Principal Beneficial Owners.........................................................   78
  Shares Beneficially Owned By Directors and Executive Officers.......................   78
 
EXPERTS...............................................................................   79
 
VALIDITY OF AHMANSON COMMON STOCK.....................................................   79
 
APPENDICES:
 
APPENDIX A -- Amended and Restated Agreement and Plan of Merger, dated as of October
              5, 1997, by and between Ahmanson and Coast
APPENDIX B -- [Reserved]
APPENDIX C -- Form of Commitment
APPENDIX D -- Opinion of Goldman, Sachs & Co.
APPENDIX E -- Section 262 of the DGCL
</TABLE>
    
 
                                       ii
<PAGE>   9
 
                             AVAILABLE INFORMATION
 
     Ahmanson and Coast are each subject to the reporting and informational
requirements of the Securities Exchange Act of 1934, as amended, and the rules
and regulations thereunder (the "Exchange Act"), and, in accordance therewith,
file reports, proxy statements and other information relating to their business,
financial position, results of operations and other matters with the Securities
and Exchange Commission (the "Commission"). Such reports, proxy statements and
other information filed by Ahmanson and Coast with the Commission may be
inspected and copied at the principal office of the Commission at Room 1024, 450
Fifth Street, N.W., Washington, D.C. 20549, and may be inspected at the
Commission's Regional Offices at 7 World Trade Center, New York, New York 10048,
and Northwestern Atrium Center, 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661. Copies of such material may also be obtained from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549, at prescribed rates. Certain of such reports, proxy statements and other
information are also available from the Commission over the Internet at
http://www.sec.gov. In addition, Ahmanson Common Stock and Coast Common Stock
are traded on the NYSE and the Pacific Exchange. Reports, proxy statements, and
other information concerning Ahmanson and Coast may be inspected at the offices
of the NYSE, 20 Broad Street, New York, New York 10005 and at the offices of the
Pacific Exchange, 115 Sansome Street, 2nd Floor, San Francisco, California
94104.
 
   
     Ahmanson has filed with the Commission a Registration Statement on Form S-4
(together with any amendments thereto, the "Ahmanson Registration Statement")
under the Securities Act of 1933, as amended, and the rules and regulations
thereunder (the "Securities Act"), of which the following sections of this Proxy
Statement/Prospectus are a part: the Cover Page (other than the fourth, seventh
and ninth paragraphs and the first legend on the Cover Page) and the sections of
the Proxy Statement/Prospectus under the captions "Available Information,"
"Incorporation of Certain Information by Reference," "Summary" (other than
"Summary -- Formation of the CPR Trust and the CPR Certificate Distribution,"
"Summary -- Resale of CPR Certificates" and "Summary -- No Existing Trading
Market for the CPR Certificates"), "General Information" (other than "General
Information -- Special Meeting -- CPR Trust Prospectus"), "The Merger" (other
than "The Merger -- Distribution of the CPR Certificates"), "Appraisal Rights,"
"Ahmanson and Coast Unaudited Pro Forma Combined Financial Information,"
"Description of Ahmanson Capital Stock," "Certain Differences in the Rights of
Ahmanson Stockholders and Coast Stockholders," "Comparative Market Prices and
Dividends" (other than "Comparative Market Prices and Dividends -- No Existing
Trading Market for the CPR Certificates"), "Voting Securities and Principal
Stockholders of Coast," "Experts" and "Validity of Ahmanson Common Stock." The
CPR Trust has filed with the Commission a Registration Statement on Form S-4
(together with any amendments thereto, the "CPR Trust Registration Statement"
and, together with the Ahmanson Registration Statement, the "Registration
Statements") under the Securities Act, of which the following sections of this
Proxy Statement/Prospectus are a part: the fourth, seventh and ninth paragraphs
and the first legend of the Cover Page and the sections of the Proxy
Statement/Prospectus under the captions "Summary -- Formation of the CPR Trust
and the CPR Certificate Distribution," "Summary -- Resale of CPR Certificates,"
"Summary -- No Existing Trading Market for the CPR Certificates," "Risk
Factors," "General Information -- Special Meeting -- CPR Trust Prospectus," "The
Merger--Distribution of the CPR Certificates," "Comparative Market Prices and
Dividends -- No Existing Trading Market for the CPR Certificates" and "The CPR
Trust and the CPR Certificates." This Proxy Statement/Prospectus does not
contain all of the information set forth in the Registration Statements, certain
portions of which have been omitted pursuant to the rules and regulations of the
Commission and to which portions reference is hereby made for further
information. While the Proxy Statement/Prospectus contains an explanation of all
material features, as they relate to the stockholders of Coast, of each contract
or other document filed as an exhibit to the Registration Statements, the
statements contained in this Proxy Statement/Prospectus concerning the
provisions of such documents filed or incorporated by reference as exhibits to
the Registration Statements are necessarily brief descriptions thereof, and are
not necessarily complete, and each such statement is qualified in its entirety
by reference to the full text of such document.
    
 
                                        3
<PAGE>   10
 
     All information contained herein with respect to Ahmanson and its
subsidiaries has been supplied by Ahmanson, and all information with respect to
Coast and its subsidiaries and the CPR Trust has been supplied by Coast and the
CPR Trust.
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PROXY STATEMENT/PROSPECTUS
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION SHOULD NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED BY AHMANSON, COAST OR THE CPR TRUST. NEITHER THE
DELIVERY OF THIS PROXY STATEMENT/PROSPECTUS NOR ANY DISTRIBUTION OF THE
SECURITIES TO WHICH THIS PROXY STATEMENT/PROSPECTUS RELATES SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF AHMANSON, COAST OR ANY OF THEIR RESPECTIVE SUBSIDIARIES OR THE CPR
TRUST SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN IS CORRECT
AS OF ANY TIME SUBSEQUENT TO ITS DATE. THIS PROXY STATEMENT/PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO PURCHASE, ANY
SECURITIES OTHER THAN THE SECURITIES TO WHICH IT RELATES OR AN OFFER TO SELL OR
A SOLICITATION OF AN OFFER TO PURCHASE THE SECURITIES OFFERED BY THIS PROXY
STATEMENT/PROSPECTUS IN ANY JURISDICTION IN WHICH SUCH AN OFFER OR SOLICITATION
IS NOT LAWFUL.
 
                                        4
<PAGE>   11
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
   
     The following documents filed by Ahmanson with the Commission under Section
13(a) or 15(d) of the Exchange Act are hereby incorporated by reference in this
Proxy Statement/Prospectus: (a) Ahmanson's Annual Report on Form 10-K as of and
for the year ended December 31, 1996 (the "1996 Ahmanson 10-K"); (b) the
portions of Ahmanson's Proxy Statement for the Annual Meeting of stockholders
held on April 21, 1997 that have been incorporated by reference in the 1996
Ahmanson 10-K; (c) Ahmanson's Quarterly Reports on Form 10-Q for the three
months ended March 31, 1997, the six months ended June 30, 1997 and the nine
months ended September 30, 1997; (d) the description of Ahmanson Common Stock
set forth in Ahmanson's registration statement on Form 8-A filed pursuant to
Section 12 of the Exchange Act on June 24, 1985, and any amendment or report
filed for the purpose of updating any such description; (e) Ahmanson's Current
Reports on Form 8-K, dated January 15, 1997, February 17, 1997, February 21,
1997, February 25, 1997, March 10, 1997, March 17, 1997, March 19, 1997, March
26, 1997, April 8, 1997, April 28, 1997, May 19, 1997, June 4, 1997, July 10,
1997, October 6, 1997, October 14, 1997 and November 7, 1997; and (f) the
description of the Ahmanson Rights contained in Item 1 of Ahmanson's
registration statement on Form 8-A dated November 26, 1997, and any amendment or
report filed for the purpose of updating such description.
    
 
     The following documents filed by Coast with the Commission under Section
13(a) or 15(d) of the Exchange Act are hereby incorporated by reference in this
Proxy Statement/Prospectus: (a) Coast's Annual Report on Form 10-K for the year
ended December 31, 1996 (the "1996 Coast 10-K"); (b) the portions of Coast's
Proxy Statement for the Annual Meeting of stockholders held on April 23, 1997
that have been incorporated by reference in the 1996 Coast 10-K; (c) Coast's
Quarterly Reports on Form 10-Q for the three months ended March 31, 1997, the
six months ended June 30, 1997 and the nine months ended September 30, 1997; (d)
Coast's Current Report on Form 8-K, dated October 6, 1997; and (e) the
description of the Coast Rights contained in Item 1 of Coast's registration
statement on Form 8-A dated August 31, 1989, and any amendment or report filed
for the purpose of updating such description.
 
     All documents filed by Ahmanson and Coast pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date of this Proxy
Statement/Prospectus and prior to the Special Meeting are hereby incorporated by
reference in this Proxy Statement/Prospectus and shall be deemed a part hereof
from the date of filing of such document.
 
     Any statement contained herein, in any supplement hereto or in a document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of the Registration Statements and this
Proxy Statement/Prospectus to the extent that a statement contained herein, in
any supplement hereto or in any other subsequently filed document which also is
or is deemed to be incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of the Registration
Statements, this Proxy Statement/Prospectus or any supplement hereto.
 
   
     THIS PROXY STATEMENT/PROSPECTUS INCORPORATES BY REFERENCE CERTAIN DOCUMENTS
THAT ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. SUCH DOCUMENTS ARE
AVAILABLE WITHOUT CHARGE UPON REQUEST FROM: AS TO AHMANSON DOCUMENTS, H. F.
AHMANSON & COMPANY, 4900 RIVERGRADE ROAD, IRWINDALE, CALIFORNIA 91706,
ATTENTION: INVESTOR RELATIONS AND TELEPHONE REQUESTS MAY BE DIRECTED TO (626)
814-7986; AND, AS TO COAST DOCUMENTS, COAST SAVINGS FINANCIAL, INC., 1000
WILSHIRE BOULEVARD, LOS ANGELES, CALIFORNIA 90017, ATTENTION: INVESTOR RELATIONS
AND TELEPHONE REQUESTS MAY BE DIRECTED TO (213) 362-2000. IN ORDER TO ENSURE
TIMELY DELIVERY OF THE DOCUMENTS, ANY REQUEST SHOULD BE MADE BY FEBRUARY   ,
1998.
    
 
           CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS
 
     THIS PROXY STATEMENT/PROSPECTUS CONTAINS OR INCORPORATES BY REFERENCE
CERTAIN FORWARD LOOKING STATEMENTS WITHIN THE MEANING OF THE SECURITIES ACT, THE
EXCHANGE ACT AND THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 WITH
RESPECT TO THE FINANCIAL CONDITION, RESULTS OF OPERATIONS
 
                                        5
<PAGE>   12
 
   
AND BUSINESS OF AHMANSON AND, ASSUMING THE CONSUMMATION OF THE MERGER, A
COMBINED AHMANSON/COAST COMPANY. SUCH FORWARD LOOKING STATEMENTS INCLUDE
STATEMENTS RELATING TO (A) THE COST SAVINGS AND ACCRETION TO CASH EARNINGS AND
REPORTED EARNINGS THAT WILL BE REALIZED FROM THE MERGER, (B) THE IMPACT ON
REVENUES OF THE PROPOSED MERGER, INCLUDING ESTIMATED ENHANCED REVENUES AND COST
SAVINGS, AND (C) THE RESTRUCTURING CHARGES EXPECTED TO BE INCURRED IN CONNECTION
WITH THE PROPOSED MERGER, BUT DO NOT INCLUDE ANY STATEMENTS RELATING TO THE
ISSUANCE AND DISTRIBUTION OF THE CPR CERTIFICATES (AS DEFINED HEREIN) WHICH ARE
NOT FORWARD LOOKING STATEMENTS WITHIN THE MEANING OF THE SECURITIES ACT,
EXCHANGE ACT OR PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995. THESE FORWARD
LOOKING STATEMENTS INVOLVE CERTAIN RISKS AND UNCERTAINTIES. NO ASSURANCE CAN BE
GIVEN THAT SUCH RESULTS WILL BE REALIZED. FACTORS THAT MAY CAUSE ACTUAL RESULTS
TO DIFFER MATERIALLY FROM THOSE CONTEMPLATED BY SUCH FORWARD LOOKING STATEMENTS
INCLUDE, AMONG OTHERS, THE FOLLOWING POSSIBILITIES: (1) EXPECTED COST SAVINGS
FROM THE PROPOSED MERGER CANNOT BE FULLY REALIZED OR REALIZED WITHIN THE
EXPECTED TIME FRAME; (2) REVENUES FOLLOWING THE PROPOSED MERGER ARE LOWER THAN
EXPECTED; (3) COMPETITIVE PRESSURE AMONG DEPOSITORY INSTITUTIONS INCREASES
SIGNIFICANTLY; (4) COSTS OR DIFFICULTIES RELATED TO THE INTEGRATION OF THE
BUSINESSES OF AHMANSON AND COAST ARE GREATER THAN EXPECTED; (5) CHANGES IN THE
INTEREST RATE ENVIRONMENT REDUCE INTEREST MARGINS; (6) GENERAL ECONOMIC
CONDITIONS, EITHER NATIONALLY OR IN THE STATES IN WHICH THE COMBINED COMPANY
WILL BE DOING BUSINESS, ARE LESS FAVORABLE THAN EXPECTED; AND (7) LEGISLATION OR
REGULATORY CHANGES ADVERSELY AFFECT THE BUSINESSES IN WHICH THE COMBINED COMPANY
WOULD BE ENGAGED.
    
 
                                        6
<PAGE>   13
 
                                    SUMMARY
 
     The following is a summary of certain information contained elsewhere in
this Proxy Statement/Prospectus. This summary is not intended to be a complete
description of the matters covered in this Proxy Statement/Prospectus and is
subject to and qualified in its entirety by reference to the more detailed
information contained elsewhere in this Proxy Statement/Prospectus, including
the Appendices hereto, and in the documents incorporated by reference in this
Proxy Statement/Prospectus. A copy of the Merger Agreement and the form of
Commitment are set forth as Appendices A and C to this Proxy
Statement/Prospectus, respectively, and reference is made thereto for a complete
description of the terms of the Merger and the terms of the Commitment,
respectively. Stockholders are urged to read carefully the entire Proxy
Statement/Prospectus, including the Appendices. As used in this Proxy
Statement/Prospectus, the terms "Ahmanson" and "Coast" refer to such
corporations, respectively, and where the context requires, such corporations
and their respective subsidiaries.
 
PARTIES TO THE MERGER
 
  Ahmanson.
 
   
     Ahmanson, a Delaware corporation, is a savings and loan holding company
which conducts its principal business operations through Home Savings, a
federally chartered savings bank. Ahmanson engages in residential real estate
lending, consumer and small business banking, and related financial services. At
September 30, 1997, Home Savings had 301 branches in California, 27 branches in
Florida and 43 branches in Texas. On December 4, 1997, Home Savings announced
that it had entered into an agreement to sell all of its branches in Florida to
SouthTrust Bank, N.A.
    
 
     At September 30, 1997, Ahmanson had total assets of $46.8 billion, deposits
of $32.4 billion and stockholders' equity of $2.4 billion. Based on deposits,
Ahmanson was at that date the fourth largest depository institution in
California and the 19th largest in the United States and the second largest
savings association in the United States. Home Savings maintains its capital
levels above the "well capitalized" standards established by the Office of
Thrift Supervision.
 
     Ahmanson has its principal executive offices at 4900 Rivergrade Road,
Irwindale, California 91706, telephone number (626) 960-6311.
 
  Coast.
 
     Coast, a Delaware corporation, is a savings and loan holding company which
conducts its principal business operations through Coast Federal. Substantially
all of Coast's consolidated revenues are derived from the operations of Coast
Federal, and Coast Federal represented substantially all of Coast's consolidated
assets and liabilities at September 30, 1997.
 
   
     Coast Federal, a federal savings bank headquartered in Los Angeles,
California, was founded in 1935 and converted from mutual to stock form in 1985.
Based on total deposits of $9.0 billion at September 30, 1997, Coast Federal was
the tenth largest savings association in the United States and the eighth
largest depository institution in California. Coast Federal's business is that
of a financial intermediary and consists primarily of attracting deposits from
the general public and using such deposits, together with borrowings and other
funds, to make mortgage loans secured by residential real estate located in
California. At September 30, 1997, Coast Federal operated 90 retail banking
offices, all of which are located in California.
    
 
     Coast has its principal executive offices at 1000 Wilshire Boulevard, Los
Angeles, California 90017, telephone number (213) 362-2000.
 
SPECIAL MEETING; RECORD DATE
 
   
     The Special Meeting will be held on February   , 1998, at        a.m., at
the OMNI Hotel, 930 Wilshire Boulevard, Los Angeles, California. At the Special
Meeting, Coast stockholders will consider and vote upon approval and adoption of
the Merger Agreement and the transactions contemplated thereby,
    
 
                                        7
<PAGE>   14
 
   
including the approval of the Merger, the establishment of and the terms of the
CPR Trust, the CPR Certificate Distribution, the engagement of the Litigation
Trustees (including the terms of their engagement) for the CPR Trust, the terms
of the Commitment and the rights of the holders of the certificates (the "CPR
Certificates"), which will represent assignable and beneficial interests in the
assets of the CPR Trust (collectively, the "Transaction Proposal").
    
 
   
     The Coast Board has fixed the close of business on December 23, 1997, as
the record date for determining the Coast stockholders entitled to receive
notice of and to vote at the Special Meeting (the "Record Date"). As of the
Record Date, 19,262,934 shares of Coast Common Stock were issued and outstanding
and entitled to be voted at the Special Meeting. For additional information with
respect to the Special Meeting, including the Record Date and vote required for
approval, see "General Information."
    
 
THE MERGER
 
  General.
 
   
     The Merger Agreement provides that Coast will merge with and into Ahmanson,
which will be the surviving corporation in the Merger and will be governed by
the laws of the State of Delaware. If the Transaction Proposal is approved at
the Special Meeting, all required governmental and other consents and approvals
are obtained and all the other conditions to the obligations of the parties to
consummate the Merger are either satisfied or waived (if permitted), the CPR
Certificate Distribution will be effected and, immediately thereafter, the
Merger will be consummated. In addition, Ahmanson will enter into the Commitment
with the CPR Trust at the Effective Time and effective at the Effective Time. A
description of the Commitment and the related Commitment Amount are more fully
set forth below under "-- Commitment" and "The Merger -- Merger Consideration;
Exchange Ratio; Commitment." A copy of the Merger Agreement and a copy of the
form of Commitment are set forth as Appendices A and C to this Proxy
Statement/Prospectus, respectively. See "The Merger."
    
 
  Merger Consideration.
 
     The merger consideration (the "Merger Consideration") pursuant to the
Merger Agreement consists of (a) the shares of Ahmanson Common Stock issuable in
exchange for shares of Coast Common Stock pursuant to the Merger Agreement, and
cash in lieu of fractional share interests, and (b) the entering into of the
Commitment by Ahmanson.
 
  Exchange Ratio.
 
     At the time of the Merger, each outstanding share of Coast Common Stock
(other than (a) certain shares, if any, held by Coast, Ahmanson or their
subsidiaries and (b) Dissenters' Shares, if any) will be converted into and
exchanged for 0.8082 of a share of Ahmanson Common Stock (together with the
appropriate number of Ahmanson Rights as provided in the Ahmanson Rights Plan).
No fractional shares of Ahmanson Common Stock will be issued. Rather, cash
(without interest) will be paid in lieu of any fractional share interest to
which any Coast stockholder would be entitled upon consummation of the Merger,
determined by multiplying such fraction by the average of the last sale prices
of the Ahmanson Common Stock, as reported by the NYSE Composite Tape (as
reported in The Wall Street Journal or, if not reported therein, in another
authoritative source) for the five NYSE trading days immediately preceding the
Effective Date.
 
  Commitment.
 
   
     Ahmanson will enter into the Commitment, substantially in the form attached
hereto as Appendix C, with the CPR Trust at the Effective Time and effective at
the Effective Time. Immediately prior to the Effective Time, and provided that
all other conditions to consummation of the Merger have been either satisfied or
waived (if permitted), the CPR Certificates will be distributed to the Coast
stockholders (and to the other persons specified in the Merger Agreement and
described herein under "The Merger -- The CPR Trust, the CPR Certificates and
the CPR Certificate Distribution"). The Commitment will obligate
    
 
                                        8
<PAGE>   15
 
   
Ahmanson to pay to the CPR Trust from time to time an aggregate amount equal to
the Commitment Amount. As used in this Proxy Statement/Prospectus, the
Commitment Amount means an amount equal to the Litigation Proceeds (as defined
herein) minus the Reimbursements (as defined herein) plus the Assumed Tax
Benefit (as defined herein). Litigation Proceeds means any and all cash payments
actually received by Coast Federal or Home Savings or any of their affiliates
(the "Ahmanson Group") pursuant to a final, non-appealable judgment or a final
settlement of the Litigation (the "Cash Proceeds") and the non-cash payments, if
any, actually received by the Ahmanson Group pursuant to a final, non-appealable
judgment or a final settlement of the Litigation (the "Non-Cash Proceeds").
Reimbursements means (a) an amount equal to the Expense Fund (as defined herein)
plus (b) interest on the portions of the Expense Fund withdrawn by the CPR Trust
calculated from the time of any such withdrawal at an annual interest rate equal
to the Reference Rate of Bank of America (the "Reference Rate") in effect from
time to time plus 250 basis points, compounded quarterly plus (c) the Assumed
Tax Liability (as defined herein) plus (d) in the event Litigation Proceeds are
required to be included in income for federal income tax purposes in a taxable
year prior to the year such proceeds are received in cash (either because of the
accrual of Cash Proceeds before the payment thereof or the time required to
liquidate Non-Cash Proceeds), interest at the Reference Rate plus 250 basis
points from the date of such payment of taxes to the date of receipt of cash.
The Expense Fund means an amount equal to $20 million, less the expenses
relating to the Litigation incurred and paid between August 31, 1997 and the
Effective Date, which amount Ahmanson will deposit at the Effective Time in a
non-interest bearing demand-deposit account in the name of the CPR Trust at Home
Savings. Subject to certain exceptions, the Assumed Tax Liability will be
computed on the assumption that the Litigation Proceeds will be includible in
the Ahmanson Group's gross income as ordinary income in full at the highest net
marginal federal, state and local income tax rate. For additional information
concerning the Commitment, the Commitment Amount and related matters, see "The
Merger -- Merger Consideration; Exchange Ratio; Commitment."
    
 
  Vote Required.
 
   
     Approval of the Transaction Proposal requires the affirmative vote of a
majority of the outstanding shares of the Coast Common Stock entitled to vote at
the Special Meeting. As of the Record Date, the directors and executive officers
of Coast and their affiliates held 175,261 shares (or approximately 0.91% of the
outstanding shares) of Coast Common Stock, not including unissued shares deemed
beneficially owned pursuant to outstanding Coast Stock Options. As of the Record
Date, Ahmanson held 100 shares of Coast Common Stock and directors and executive
officers of Ahmanson and their affiliates held no shares of Coast Common Stock.
See "General Information -- Vote Required" and "The Merger -- Interests of
Certain Persons in the Transaction Proposal."
    
 
     Approval of the Merger Agreement by holders of Ahmanson Common Stock is not
required under the Delaware General Corporation Law ("DGCL") or the rules of the
NYSE. See "General Information -- Vote Required."
 
  Recommendation of the Coast Board.
 
     The Coast Board believes that approval of the Merger Agreement and the
transactions contemplated thereby, including the approval of the Merger, the
establishment of and the terms of the CPR Trust, the CPR Certificate
Distribution, the engagement of the Litigation Trustees (including the terms of
their engagement) for the CPR Trust, the terms of the Commitment and the rights
of the holders of CPR Certificates, is in the best interests of Coast and its
stockholders and unanimously recommends that the stockholders of Coast vote
"FOR" approval of the Transaction Proposal. The Coast Board has unanimously
approved the Transaction Proposal. In deciding to approve the Transaction
Proposal, the Coast Board considered a number of factors, including the
financial condition, results of operations and future prospects of Coast and
Ahmanson. See "The Merger -- Background of the Merger" and "-- Reasons of Coast
for the Merger." As a result of the difficulty in establishing the value of the
Litigation for purposes of the Merger, the Coast Board determined that the
ultimate value of the Litigation should be retained by Coast's stockholders in
connection with the Merger and, thus, the Coast Board, as an integral part of
its approval of the Transaction Proposal, approved the
 
                                        9
<PAGE>   16
 
   
establishment of the CPR Trust, the terms of the CPR Certificates and the
Commitment, the CPR Certificate Distribution and related matters. See "The
Merger -- Interests of Certain Persons in the Transaction Proposal."
    
 
     THE COAST BOARD UNANIMOUSLY RECOMMENDS THAT COAST STOCKHOLDERS VOTE "FOR"
APPROVAL OF THE TRANSACTION PROPOSAL.
 
  Opinion of Coast's Financial Advisor.
 
     Goldman, Sachs & Co. ("Goldman Sachs"), Coast's financial advisor, has
rendered its written opinion, dated October 5, 1997, to the Coast Board to the
effect that, as of such date, based on and subject to the matters set forth in
such opinion, the proposed Consideration (as defined herein) to be received by
the holders of Coast Common Stock was fair from a financial point of view to the
Coast stockholders. Goldman Sachs has confirmed its October 5, 1997 opinion as
of the date of this Proxy Statement/Prospectus by delivery of its written
opinion to the Coast Board, dated the date hereof. For additional information,
see "The Merger -- Opinion of Coast's Financial Advisor." The opinion of Goldman
Sachs, dated the date of this Proxy Statement/Prospectus, is attached as
Appendix D to this Proxy Statement/Prospectus. Holders of Coast Common Stock are
urged to read such opinion in its entirety for descriptions of the procedures
followed, matters considered and limitations on the reviews undertaken in
connection therewith.
 
  Effective Time.
 
   
     If the Transaction Proposal is approved by the requisite vote of the Coast
stockholders, all required governmental and other consents and approvals are
obtained and the other conditions to the obligations of the parties to
consummate the Merger are either satisfied or waived (if permitted), Coast will
distribute (the "CPR Certificate Distribution") to the Coast stockholders one
CPR Certificate for each share of Coast Common Stock held by such stockholders
on the Effective Date with a record and payment date for such CPR Certificate
Distribution on the Effective Date immediately prior to the Effective Time and
the Merger will be consummated and will become effective on the date (the
"Effective Date") and at the time (the "Effective Time") that a certificate of
merger is filed with the Secretary of State of the State of Delaware or at the
time specified in such certificate. The Commitment will be entered into by
Ahmanson at the Effective Time and effective at the Effective Time.
    
 
     Unless otherwise agreed by Coast and Ahmanson, and subject to the
conditions to the obligations of the parties to effect the Merger, the parties
have agreed to cause the Effective Date to occur on the fifth business day to
occur after the last of the conditions to the consummation of the Merger have
been satisfied or waived (or, at the election of Ahmanson, on the last business
day of the month in which such date occurs or, if such date occurs on one of the
last five business days of such month, on the last business day of the
succeeding month). Ahmanson and Coast each has the right, acting unilaterally,
to terminate the Merger Agreement should the Merger not be consummated by June
30, 1998 (unless the failure to consummate the Merger is a result of a breach by
the party seeking to terminate). See "The Merger -- Effective Time" and "--
Termination; Termination Fee."
 
  Delivery of Ahmanson Certificates.
 
     Promptly after the Effective Date, Ahmanson will send or will cause to be
sent transmittal materials to each record holder of shares of Coast Common Stock
outstanding at the Effective Time for use in exchanging those certificates for
shares of Ahmanson Common Stock and cash in lieu of fractional share interests.
See "The Merger -- Distribution of Ahmanson Common Stock Certificates."
 
  Certain Federal Income Tax Consequences.
 
     The Merger is intended to be a reorganization within the meaning of Section
368(a) of the Internal Revenue Code of 1986 (the "Code") with the consequence
that no gain or loss will be recognized for federal income tax purposes by Coast
or Coast stockholders as a result of the Merger except in the case of a Coast
stockholder (a) for gain that may be recognized in an amount not exceeding the
fair market value at the
 
                                       10
<PAGE>   17
 
Effective Time of the CPR Certificates received by such stockholder (which will
include a proportionate share of the value attributable to Ahmanson's having
entered into the Commitment) and (b) with respect to any cash received in lieu
of fractional share interests.
 
     Consummation of the Merger is conditioned in part upon the receipt by
Ahmanson and Coast of opinions from their respective legal counsels that the
Merger will be a reorganization within the meaning of Section 368(a) of the
Code.
 
   
     All stockholders should carefully read the discussion of the material
federal income tax consequences of the proposed Merger under "The
Merger -- Certain Federal Income Tax Consequences." In addition, stockholders
are urged to consult with their own tax advisers as to the federal, state, local
and foreign tax consequences in their particular circumstances.
    
 
  Management After the Merger.
 
     Ahmanson will be the surviving corporation resulting from the Merger and
will continue to be managed by its current executive officers. Ahmanson has
agreed to cause Mr. Ray Martin, Chairman of the Board and Chief Executive
Officer of Coast, to be elected or appointed as a director of Ahmanson. See "The
Merger -- Management and Operations After the Merger."
 
  Interests of Certain Persons in the Transaction Proposal.
 
   
     Certain members of Coast's management and the Coast Board have interests in
the Merger and the transactions contemplated thereby in addition to their
interests as stockholders of Coast generally. Those interests relate to, among
other things, provisions in the Merger Agreement regarding indemnification and
maintenance of directors and officers' liability insurance, the treatment of
outstanding Coast Stock Options (as defined herein) and outstanding Coast
Performance Share Awards (as defined herein) and Coast SARs (as defined herein)
with respect to Coast Common Stock and the appointment of Mr. Martin as a
director of Ahmanson.
    
 
   
     In addition, certain Coast executives will receive benefits to be paid in
connection with a change of control of Coast. Assuming termination of the
employment of Coast's executive officers, pursuant to employment agreements
between Coast and each of Messrs. Ray Martin (Chairman of the Board and Chief
Executive Officer of Coast and Coast Federal), Robert Hunt (President and Chief
Operating Officer of Coast and Coast Federal), James Boyle (Senior Executive
Vice President of Coast and Coast Federal), James Barritt (Senior Executive Vice
President and Chief Financial Officer of Coast and Coast Federal) and Norman
Raiden (Senior Executive Vice President of Coast and Coast Federal, and General
Counsel of Coast, and until December 3, 1997, of Coast Federal), the severance
payments required to be made to such executive officers would be approximately
$2,735,000, $1,933,000, $1,481,000, $1,335,000 and $1,377,000, respectively, as
a result of the Merger being deemed a change of control under such employment
agreements. Further, assuming termination of the employment of Messrs. Rich and
Neal, Coast's two other executive officers, pursuant to severance agreements
between Coast and such executive officers, the severance payments required to be
made to such executive officers would aggregate approximately $265,000, as a
result of the Merger being deemed a change in control under such severance
agreements. In addition, assuming termination of the employment of Coast's
executive officers, lump sum payments made under Coast's supplemental executive
retirement plan to Messrs. Martin, Hunt, Boyle, Barritt and Raiden would be
approximately $5,746,000, $1,728,000, $1,547,000, $680,000 and $2,325,000,
respectively, and to such other Coast executive officers as a group would be
approximately $574,000, as a result of the Merger being deemed a change in
control under such plan. Finally, assuming termination of the employment of
Coast's executive officers, such executive officers would receive lump sum
payments of amounts previously deferred under Coast's deferred compensation plan
in January 1999, as a result of the Merger being deemed a change in control
under such plan. See "The Merger -- Interests of Certain Persons in the
Transaction Proposal" and "-- Stock Options; Performance Share Awards; SARs"
below.
    
 
   
     Each of Messrs. Martin, Hunt, Barritt and Raiden will also be Litigation
Trustees of the CPR Trust and, as such, will receive as compensation pursuant to
the CPR Trust Agreement during the term of his service as a
    
 
                                       11
<PAGE>   18

   
Litigation Trustee, fees of $400,000 per year for five years (except that if the
Litigation is sooner terminated, the remainder of such fees (but in no event
with respect to a period longer than two years after the year in which such
termination occurs) will be accelerated upon final resolution of the Litigation
and receipt by the Ahmanson Group of the Litigation Proceeds), plus
reimbursement of all reasonable out-of-pocket expenses. If the services of the
Litigation Trustees continue to be necessary after the initial five-year period
or such receipt of Litigation Proceeds, the Litigation Trustees will be entitled
to a fee of $200 per hour until termination of the CPR Trust. See "The
Merger -- Interests of Certain Persons in the Transaction Proposal."
    
 
  Conditions to Consummation.
 
     Consummation of the Merger is subject to various conditions, including,
among other matters: (a) approval of the Transaction Proposal by the Coast
stockholders and notice from holders of no more than 5% of the outstanding
shares of Coast Common Stock that their shares of Common Stock be treated as
Dissenters' Shares; (b) receipt of all governmental and other consents and
approvals necessary to permit consummation of the Merger; (c) satisfaction of
certain other usual conditions, including the receipt of the tax opinions
discussed above; and (d) the establishment of the CPR Trust and the consummation
of the CPR Certificate Distribution, the execution and delivery of the
Commitment by Ahmanson and the transfer of the Expense Fund to the CPR Trust.
Under the terms of the Merger Agreement, certain conditions to the Merger may
generally be waived by Ahmanson or Coast, as applicable. See "The
Merger -- Conditions to Consummation" and "-- Amendment and Waiver."
 
  Regulatory Approvals.
 
   
     The Merger is subject to the prior approval of the Office of Thrift
Supervision (the "OTS") and may be subject to the approval of or notice to other
regulatory authorities. An application for approval of the Merger has been filed
with the OTS. There can be no assurance that the approval of the OTS will be
obtained or as to the timing or conditions of such approval. See "The
Merger -- Regulatory Approvals."
    
 
  Termination.
 
   
     The Merger Agreement may be terminated, and the Merger abandoned, at any
time prior to the Effective Time by mutual action of the board of directors of
both Coast and Ahmanson, or by action of the board of directors of either
company under certain circumstances, including if the Merger is not consummated
by June 30, 1998, unless the failure to consummate by such time is due to
knowing action or inaction of the party seeking to terminate, which action or
inaction is in violation of such party's obligations under the Merger Agreement.
Ahmanson may terminate the Merger Agreement if the Coast Board withdraws its
recommendation of the Transaction Proposal or modifies or changes such
recommendation in a manner adverse in any respect to the interests of Ahmanson.
If the Merger Agreement is terminated under certain specified circumstances, and
within 12 months after such termination Coast or any of its subsidiaries enters
into a definitive agreement with respect to an acquisition proposal by a third
party, Coast will be obligated to pay to Ahmanson a termination fee equal to $35
million. See "The Merger -- Termination; Termination Fee."
    
 
  Accounting Treatment.
 
     Upon consummation of the Merger, Ahmanson will account for the acquisition
of Coast using the purchase method of accounting. Accordingly, the consideration
to be paid in the Merger will be allocated to assets acquired and liabilities
assumed based on their estimated fair values at the Effective Date. Income (or
loss) of Coast prior to the Effective Date will not be included in income of the
combined company. See "The Merger -- Accounting Treatment."
 
  Dissenters' Rights.
 
     Any holder of record of shares of Coast Common Stock who does not vote in
favor of the Transaction Proposal, delivers a demand for appraisal prior to the
vote of the Coast stockholders on the Transaction Proposal and complies with the
additional procedures required under Delaware law will have the right to
 
                                       12
<PAGE>   19
 
obtain cash payment for the "fair value" of such stockholders' shares (excluding
any element of value arising from the accomplishment or expectation of the
Merger). In order to exercise such rights, a stockholder must comply with all
the procedural requirements of Section 262 of the DGCL, the full text of which
is attached as Appendix E to this Proxy Statement/Prospectus. Section 262 should
be read in its entirety. Any such dissenting stockholder will not be entitled to
the Merger Consideration in respect of such shares unless and until such
dissenting stockholder shall have failed to perfect or shall have timely
withdrawn such dissenting stockholder's right to dissent from the Merger, and
shall instead be entitled to receive the payment provided by Section 262 of the
DGCL. FAILURE TO TAKE ANY OF THE STEPS REQUIRED UNDER SECTION 262 IN A TIMELY
MANNER WILL RESULT IN A LOSS OF APPRAISAL RIGHTS. See "Appraisal Rights."
 
     In connection with any appraisal proceeding, the "fair value" of shares of
Coast Common Stock is to be determined as of immediately prior to the CPR
Certificate Distribution and the Merger. Each CPR Certificate distributed to
each Coast stockholder will provide that it shall automatically be redeemed for
$0.01 in cash immediately following the Merger if the holder of the share as to
which such CPR Certificate was issued has given notice of an intent to exercise
appraisal rights. If any Coast stockholder who gives notice of intent to
exercise appraisal rights subsequently withdraws, or fails to perfect, such
appraisal demand, Ahmanson will deliver to such holder the number of CPR
Certificates equal to the number of shares of Coast Common Stock as to which
such appraisal demand was withdrawn or not perfected.
 
     It is a condition to the obligation of Ahmanson to consummate the Merger
that holders of no more than 5% of the outstanding shares of Coast Common Stock
shall have given notice that their shares of Coast Common Stock be treated as
Dissenters' Shares. See "The Merger -- Conditions to Consummation."
 
  Resales of Ahmanson Common Stock.
 
     The Ahmanson Common Stock issuable in connection with the Merger will be
freely transferable by the holders of such shares, except for those holders who
may be deemed to be "affiliates" (generally including directors, certain
executive officers and 10% or more stockholders) of Coast or Ahmanson under
applicable federal securities laws. See "The Merger -- Resales of Ahmanson
Common Stock."
 
MARKET FOR COMMON STOCK
 
   
     Ahmanson Common Stock and Coast Common Stock are traded on the NYSE and the
Pacific Exchange. The following table sets forth the last sale price of Ahmanson
Common Stock, the last sale price of Coast Common Stock, and the equivalent
price per share (as explained below) of Coast Common Stock at the close of
business on October 3, 1997, the last trading day immediately preceding public
announcement of the Merger (as reported on the NYSE Composite Tape), and on
January 12, 1998, the last practicable date prior to the mailing of this Proxy
Statement/Prospectus:
    
 
   
<TABLE>
<CAPTION>
                                                           MARKET PRICE PER SHARE
                                        -------------------------------------------------------------
                                          AHMANSON               COAST               EQUIVALENT PER
                                        COMMON STOCK        COMMON STOCK(1)         SHARE PRICE(1)(2)
                                        ------------     ----------------------     -----------------
    <S>                                 <C>              <C>                        <C>
    October 3, 1997...................   $57 1/8                   $54                    $46.17
    January 12, 1998..................        $[]                   $[]                       $[]
</TABLE>
    
 
- ---------------
 
(1) The per share price of Coast Common Stock includes the value of the
    Litigation as an asset of Coast. The equivalent per share price of Coast
    Common Stock does not include the value of the Litigation as an asset of
    Coast or the value of CPR Certificates to be received by Coast stockholders
    in connection with the Merger.
 
(2) The equivalent per share price of Coast Common Stock at the specified dates
    represents the last sale price of a share of Ahmanson Common Stock on such
    date multiplied by the Exchange Ratio of 0.8082.
 
                                       13
<PAGE>   20
 
     STOCKHOLDERS ARE ADVISED TO OBTAIN CURRENT MARKET QUOTATIONS FOR AHMANSON
COMMON STOCK. NO ASSURANCE CAN BE GIVEN AS TO THE MARKET PRICE OF AHMANSON
COMMON STOCK AT OR AFTER THE EFFECTIVE TIME. SEE "COMPARATIVE MARKET PRICES AND
DIVIDENDS."
 
COMPARISON OF CERTAIN UNAUDITED PER SHARE DATA
 
     The following summary presents selected comparative unaudited per share
data for Ahmanson and Coast on an historical basis and on a pro forma combined
basis assuming the Merger had been effective during the periods presented. The
Merger will be accounted for under the purchase accounting method. The pro forma
data have been derived accordingly. The information shown below should be read
in conjunction with the historical financial data and statements of Ahmanson and
Coast incorporated by reference herein, including the respective notes thereto.
See "Available Information," "Incorporation of Certain Information by
Reference," "-- Selected Consolidated Financial Data of Ahmanson (Historical),"
"-- Selected Consolidated Financial Data of Coast (Historical)" and "The
Merger -- Accounting Treatment."
 
     The per share data set forth herein are presented for comparative purposes
only and are not necessarily indicative of the future combined financial
position, the results of the future operations or the actual results or combined
financial position of Ahmanson and Coast that would have been achieved had the
Merger been consummated as of the dates or at the beginning of the periods
indicated. While no assurance can be given, Ahmanson expects that it will
achieve substantial benefits from the Merger, including operating cost savings
and revenue enhancements. See "Ahmanson and Coast Unaudited Pro Forma Combined
Financial Information." However, the pro forma comparative unaudited per share
data do not reflect any direct costs, potential savings or revenue enhancements
which Ahmanson expects will result from the consolidation of operations of Coast
and Ahmanson and, therefore, do not purport to be indicative of the results of
future operations of Ahmanson.
 
<TABLE>
<CAPTION>
                                                                NINE MONTHS ENDED      YEAR ENDED
                                                                  SEPTEMBER 30,       DECEMBER 31,
                                                                      1997                1996
                                                                -----------------     ------------
<S>                                                             <C>                   <C>
H. F. AHMANSON & COMPANY
Net income per fully diluted common share
  Historical..................................................       $  2.69             $ 0.91(1)
  Pro forma combined..........................................          2.61               0.74
Dividends per common share(2)
  Historical..................................................          0.66               0.88
  Pro forma combined..........................................          0.66               0.88
Book value per common share (at period end)
  Historical..................................................         20.17              19.09
  Pro forma combined(3).......................................         25.16                 --
 
COAST SAVINGS FINANCIAL, INC.
Net income per fully diluted common share
  Historical..................................................       $  2.30             $ 0.56(1)
  Equivalent Coast pro forma combined(4)......................          2.11               0.60
Dividends per common share
  Historical..................................................            --                 --
  Equivalent Coast pro forma combined(4)......................          0.53               0.71
Book value per common share (at period end)
  Historical..................................................         25.21              22.84
  Equivalent Coast pro forma combined(4)......................         20.33                 --
</TABLE>
 
- ---------------
 
(1) Income per common share for both Ahmanson and Coast in 1996 was
    significantly affected by a special assessment in the third quarter to
    recapitalize the Savings Association Insurance Fund which was mandated by
    federal legislation.
 
                                       14
<PAGE>   21
 
(2) Pro forma dividends per share represent historical dividends paid by
    Ahmanson. For a discussion of Ahmanson's current and future dividend policy,
    see "Comparative Market Prices and Dividends -- Ahmanson."
 
(3) Amount is calculated by dividing total pro forma common stockholders' equity
    by the sum of the total outstanding shares of Ahmanson Common Stock plus the
    new shares of Ahmanson Common Stock to be issued in the Merger (based on the
    number of shares of Coast Common Stock outstanding at September 30, 1997,
    excluding shares beneficially owned by Ahmanson and the Exchange Ratio of
    0.8082).
 
(4) Equivalent Coast pro forma combined amounts are computed by multiplying the
    pro forma combined amounts by the Exchange Ratio of 0.8082.
 
                                       15
<PAGE>   22
 
SELECTED CONSOLIDATED FINANCIAL DATA OF AHMANSON (HISTORICAL)
 
     The following table sets forth selected historical financial data of
Ahmanson and has been derived from its consolidated financial statements. Such
selected historical financial data should be read in conjunction with Ahmanson's
audited consolidated financial statements, including the respective notes
thereto, and unaudited interim financial information, in each case incorporated
herein by reference. The interim financial information has been derived from
unaudited financial statements of Ahmanson, which, in the opinion of management,
include all adjustments, consisting only of normal recurring adjustments,
necessary for fair statement of the results for the unaudited interim periods.
Results for the interim periods are not necessarily indicative of results which
may be expected for any other interim or annual period. See "Incorporation of
Certain Information by Reference."
 
   
<TABLE>
<CAPTION>
                                               AT                                   AT DECEMBER 31,
                                          SEPTEMBER 30,   -------------------------------------------------------------------
                                              1997           1996          1995          1994          1993          1992
                                          -------------   -----------   -----------   -----------   -----------   -----------
                                                             (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
<S>                                       <C>             <C>           <C>           <C>           <C>           <C>
SUMMARY OF FINANCIAL CONDITION
  Cash and investment securities........   $ 1,084,310    $ 1,876,435   $ 1,645,450   $ 2,773,573   $ 3,906,044   $ 2,362,563
  Loans and mortgage-backed
    securities..........................    43,840,875     46,085,670    47,407,521    48,791,165    44,624,365    42,878,383
  Real estate...........................       335,095        395,428       460,421       475,264       623,519     1,127,271
  Premises and equipment................       368,825        424,567       410,947       614,817       673,879       686,693
  Goodwill and other intangible
    assets..............................       286,385        308,083       147,974       468,542       428,444       478,017
  Other assets..........................       883,667        811,861       457,273       603,432       614,994       607,580
                                           -----------    -----------   -----------   -----------   -----------   -----------
    Total assets........................   $46,799,157    $49,902,044   $50,529,586   $53,726,793   $50,871,245   $48,140,507
                                           ===========    ===========   ===========   ===========   ===========   ===========
  Deposits..............................   $32,447,317    $34,773,945   $34,244,481   $40,655,016   $38,018,653   $39,273,192
  Borrowings............................    10,575,923     11,580,521    12,236,428     9,176,085     8,879,345     4,978,583
  Other liabilities.....................     1,241,139        966,116       991,755       931,091     1,024,216     1,143,088
  Company-obligated Capital Securities
    of Subsidiary Trust.................       148,421        148,413            --            --            --            --
  Stockholders' equity..................     2,386,357      2,433,049     3,056,922     2,964,601     2,949,031     2,745,644
                                           -----------    -----------   -----------   -----------   -----------   -----------
  Total liabilities, Company-obligated
    Capital Securities of Subsidiary
    Trust and stockholders' equity......   $46,799,157    $49,902,044   $50,529,586   $53,726,793   $50,871,245   $48,140,507
                                           ===========    ===========   ===========   ===========   ===========   ===========
PER SHARE INFORMATION -- COMMON SHARES
  Book value............................   $     20.17    $     19.09   $     20.75   $     19.70   $     19.61   $     22.04
  Tangible book value...................         18.37          17.31         19.47         15.70         15.94         17.94
</TABLE>
    
 
                                       16
<PAGE>   23
 
<TABLE>
<CAPTION>
                                          NINE MONTHS ENDED
                                            SEPTEMBER 30,                           YEAR ENDED DECEMBER 31,
                                       -----------------------   --------------------------------------------------------------
                                          1997         1996         1996         1995         1994         1993         1992
                                       ----------   ----------   ----------   ----------   ----------   ----------   ----------
                                                             (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
<S>                                    <C>          <C>          <C>          <C>          <C>          <C>          <C>
SUMMARY OF OPERATIONS
  Interest income....................  $2,561,081   $2,630,081   $3,514,795   $3,699,091   $3,095,375   $3,003,422   $3,428,979
  Interest expense...................   1,632,558    1,695,289    2,262,281    2,472,336    1,798,454    1,666,350    2,070,413
                                       ----------   ----------   ----------   ----------   ----------   ----------   ----------
  Net interest income................     928,523      934,792    1,252,514    1,226,755    1,296,921    1,337,072    1,358,566
  Provision for loan losses..........      57,080      115,626      144,924      119,111      176,557      574,970      367,366
                                       ----------   ----------   ----------   ----------   ----------   ----------   ----------
  Net interest income after provision
    for loan losses..................     871,443      819,166    1,107,590    1,107,644    1,120,364      762,102      991,200
  Gain on sales of retail deposit
    branch systems...................      57,566           --        6,861      514,671       77,901           --           --
  Other non-interest income..........     207,221      173,790      244,937      183,738      182,455      317,828      266,857
  SAIF recapitalization assessment...          --      243,862      243,862           --           --           --           --
  Other non-interest expense.........     635,442      710,796      934,968      981,407      970,050    1,299,996      968,443
                                       ----------   ----------   ----------   ----------   ----------   ----------   ----------
  Income (loss) before provision for
    income taxes (benefit),
    extraordinary loss and cumulative
    effect of accounting changes.....     500,788       38,298      180,558      824,646      410,670     (220,066)     289,614
  Provision for income taxes
    (benefit)........................     186,500      (15,713)      35,300      373,700      173,312      (82,034)     133,222
                                       ----------   ----------   ----------   ----------   ----------   ----------   ----------
  Income (loss) before extraordinary
    loss and cumulative effect of
    accounting changes...............     314,288       54,011      145,258      450,946      237,358     (138,032)     156,392
  Extraordinary loss on early
    extinguishment of debt (net of
    tax benefit).....................          --           --           --           --           --      (21,607)          --
  Cumulative effect of changes in
    accounting for goodwill (1995)
    and income taxes (1992)..........          --           --           --     (234,742)          --           --       47,677
                                       ----------   ----------   ----------   ----------   ----------   ----------   ----------
  Net income (loss)..................  $  314,288   $   54,011   $  145,258   $  216,204   $  237,358   $ (159,639)  $  204,069
                                       ==========   ==========   ==========   ==========   ==========   ==========   ==========
PER SHARE INFORMATION -- COMMON
  SHARES
  Primary --
    Income (loss) before
      extraordinary loss and
      cumulative effect of accounting
      changes........................  $     2.89   $     0.16   $     0.91   $     3.39   $     1.59   $    (1.51)  $     1.19
    Net income (loss)................        2.89         0.16         0.91         1.40         1.59        (1.69)        1.60
  Fully diluted --
    Income (loss) before
      extraordinary loss and
      cumulative effect of accounting
      changes........................        2.69         0.16         0.91         3.20         1.58        (1.51)        1.19
    Net income (loss)................        2.69         0.16         0.91         1.40         1.58        (1.69)        1.60
  Dividends..........................        0.66         0.66         0.88         0.88         0.88         0.88         0.88
</TABLE>
 
                                       17
<PAGE>   24
 
SELECTED CONSOLIDATED FINANCIAL DATA OF COAST (HISTORICAL)
 
     The following table sets forth selected historical financial data of Coast
and has been derived from its consolidated financial statements. Such selected
historical financial data should be read in conjunction with Coast's audited
consolidated financial statements, including the respective notes thereto, and
unaudited interim financial information, in each case incorporated herein by
reference. The interim financial information has been derived from unaudited
financial statements of Coast, which, in the opinion of management, include all
adjustments, consisting only of normal recurring adjustments, necessary for fair
statement of the results for the unaudited interim periods. Certain items in
these selected historical financial data of Coast have been reclassified to
conform to the Ahmanson presentation. See "Incorporation of Certain Information
by Reference."
 
<TABLE>
<CAPTION>
                                                    AT                                AT DECEMBER 31,
                                               SEPTEMBER 30,   --------------------------------------------------------------
                                                   1997           1996         1995         1994         1993         1992
                                               -------------   ----------   ----------   ----------   ----------   ----------
                                                                        (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
<S>                                            <C>             <C>          <C>          <C>          <C>          <C>
SUMMARY OF FINANCIAL CONDITION
  Cash and investment securities.............   $  591,731     $  464,371   $  308,733   $  263,759   $  728,311   $  623,600
  Loans and MBS..............................    8,136,645      7,899,377    7,638,297    7,526,910    6,979,497    7,286,179
  Real estate................................       46,886         41,259       31,696       44,168      100,721      160,756
  Premises and equipment.....................       86,588         95,010       92,920       87,493       77,566       67,635
  Goodwill and other intangible assets.......        5,441          6,238        7,332       11,504       12,927       13,841
  Other assets...............................      173,122        198,697      172,702      262,683      195,795      199,815
                                                 ----------    ----------   ----------   ----------   ----------   ----------
        Total assets.........................   $9,040,413     $8,704,952   $8,251,680   $8,196,517   $8,094,817   $8,351,826
                                                 ==========    ==========   ==========   ==========   ==========   ==========
  Deposits...................................   $6,445,844     $6,356,448   $6,123,472   $5,879,808   $5,908,559   $6,136,130
  Borrowings.................................    1,988,502      1,803,718    1,593,336    1,819,561    1,657,381    1,703,948
  Other liabilities..........................      136,094        120,255      117,438      121,934      135,309      186,003
  Stockholders' equity ......................      469,973        424,531      417,434      375,214      393,568      325,745
                                                 ----------    ----------   ----------   ----------   ----------   ----------
        Total liabilities and stockholders'
          equity.............................   $9,040,413     $8,704,952   $8,251,680   $8,196,517   $8,094,817   $8,351,826
                                                 ==========    ==========   ==========   ==========   ==========   ==========
PER SHARE INFORMATION -- COMMON SHARES
  Book value.................................   $    25.21     $    22.84   $    22.46   $    20.33   $    21.32   $    20.24
  Tangible book value........................        24.92          22.51        22.07        19.71        20.62        19.38
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                   NINE MONTHS ENDED
                                                     SEPTEMBER 30,                    YEAR ENDED DECEMBER 31,
                                                  -------------------   ----------------------------------------------------
                                                    1997       1996       1996       1995       1994       1993       1992
                                                  --------   --------   --------   --------   --------   --------   --------
                                                                            (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
<S>                                               <C>        <C>        <C>        <C>        <C>        <C>        <C>
SUMMARY OF OPERATIONS
  Interest income...............................  $473,419   $449,891   $603,450   $613,181   $494,630   $515,647   $619,173
  Interest expense..............................   307,173    288,855    388,650    412,130    306,719    314,081    409,496
                                                  --------   --------   --------   --------   --------   --------   --------
  Net interest income...........................   166,246    161,036    214,800    201,051    187,911    201,566    209,677
  Provision for loan losses.....................    21,000     30,000     70,000     40,000     75,000     61,000     46,000
                                                  --------   --------   --------   --------   --------   --------   --------
  Net interest income after provision for loan
    losses......................................   145,246    131,036    144,800    161,051    112,911    140,566    163,677
  Other non-interest income.....................    37,437     37,858     50,105     57,619     42,924     60,293     64,669
  SAIF recapitalization assessment..............        --     41,978     41,978         --         --         --         --
  Other non-interest expense....................   120,387    124,699    163,576    167,033    171,790    196,622    207,978
                                                  --------   --------   --------   --------   --------   --------   --------
  Income (loss) before provision for income
    taxes (benefit) and cumulative effect of
    accounting change...........................    62,296      2,217    (10,649)    51,637    (15,955)     4,237     20,368
  Provision for income taxes (benefit)..........    17,164      1,020    (21,485)    18,835     (9,417)   (12,999)   (16,746)
                                                  --------   --------   --------   --------   --------   --------   --------
  Income (loss) before cumulative effect of
    accounting change...........................    45,132      1,197     10,836     32,802     (6,538)    17,236     37,114
  Cumulative effect of change in accounting for
    income taxes................................        --         --         --         --         --         --     10,914
                                                  --------   --------   --------   --------   --------   --------   --------
  Net income (loss).............................  $ 45,132   $  1,197   $ 10,836   $ 32,802   $ (6,538)  $ 17,236   $ 48,028
                                                  ========   ========   ========   ========   ========   ========   ========
PER SHARE INFORMATION -- COMMON SHARES
  Primary:
    Income (loss) before cumulative effect of
      accounting change.........................  $   2.32   $   0.06   $   0.56   $   1.72   $  (0.35)  $   0.94   $   2.27
    Net income (loss)...........................      2.32       0.06       0.56       1.72      (0.35)      0.94       2.94
  Fully diluted:
    Income (loss) before cumulative effect of
      accounting change.........................      2.30       0.06       0.56       1.71      (0.35)      0.94       2.25
    Net income (loss)...........................      2.30       0.06       0.56       1.71      (0.35)      0.94       2.92
  Dividends.....................................        --         --         --         --         --         --         --
</TABLE>
    
 
                                       18
<PAGE>   25
 
SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL DATA
 
     The following table sets forth selected unaudited pro forma financial data
of Ahmanson giving effect to the Merger as if it occurred as of the beginning of
the periods indicated below, after giving effect to the pro forma adjustments
described in the Notes to Pro Forma Combined Financial Statements. The Merger
will be accounted for under the purchase method of accounting. Such selected
unaudited pro forma financial data should be read in conjunction with the
Ahmanson and Coast unaudited pro forma combined financial information, including
the notes thereto, appearing elsewhere in this Proxy Statement/Prospectus. The
unaudited pro forma combined financial information does not give effect to any
anticipated cost savings or revenue enhancements in connection with the Merger.
The unaudited Pro Forma Combined Statement of Financial Condition is not
necessarily indicative of the actual financial position that would have existed
had the Merger been consummated as of the date indicated below, or that may
exist in the future. The unaudited Pro Forma Combined Statement of Operations is
not necessarily indicative of the results that would have occurred had the
Merger been consummated for the periods presented or that may be achieved in the
future. See "Incorporation of Certain Information by Reference" and "Ahmanson
and Coast Unaudited Pro Forma Combined Financial Information."
 
<TABLE>
<CAPTION>
                                                                     AT SEPTEMBER 30, 1997
                                                            ----------------------------------------
                                                                    HISTORICAL
                                                            --------------------------     PRO FORMA
                                                            AHMANSON         COAST         COMBINED
                                                            --------     -------------     ---------
                                                                         (IN MILLIONS)
<S>                                                         <C>          <C>               <C>
CONSOLIDATED BALANCE SHEET DATA
  MBS...................................................    $13,157         $ 2,068         $15,236
  Loans receivable......................................     30,684           6,068          36,764
  Goodwill and core deposit intangibles.................        286               5             707
  Assets................................................     46,799           9,040          56,278
  Deposits..............................................     32,447           6,446          38,903
  Borrowings............................................     10,576           1,989          12,571
  Stockholders' equity..................................      2,386             470           3,237
</TABLE>
 
   
<TABLE>
<CAPTION>
                                               NINE MONTHS ENDED
                                               SEPTEMBER 30, 1997        YEAR ENDED DECEMBER 31, 1996
                                          ----------------------------   ----------------------------
                                             HISTORICAL         PRO         HISTORICAL         PRO
                                          -----------------    FORMA     -----------------    FORMA
                                          AHMANSON   COAST    COMBINED   AHMANSON   COAST    COMBINED
                                          --------   ------   --------   --------   ------   --------
                                                     (IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                                       <C>        <C>      <C>        <C>        <C>      <C>
CONSOLIDATED SUMMARY OF OPERATIONS
  Net interest income...................   $  928    $  166    $1,095     $1,253    $  215    $1,469
  Provision for loan losses.............       57        21        78        145        70       215
  Non-interest income...................      265        37       302        252        50       302
  Non-interest expense..................      635       120       772      1,179       206     1,408
  Net income............................      314        45       345        146        11       139
 
PER COMMON SHARE -- FULLY DILUTED
  Net income............................     2.69      2.30      2.61       0.91      0.56      0.74
  Dividends declared....................     0.66        --      0.66       0.88        --      0.88
WEIGHTED AVERAGE COMMON SHARES
  OUTSTANDING -- FULLY DILUTED..........    112.4      19.6     127.5      109.7      19.3     124.8
</TABLE>
    
 
                                       19
<PAGE>   26
 
                              GENERAL INFORMATION
 
SPECIAL MEETING
 
   
     This Proxy Statement/Prospectus is being furnished to the stockholders of
Coast in connection with the solicitation of proxies by the Coast Board for use
at the Special Meeting. The Special Meeting will be held at        a.m., on
February   , 1998, and at any adjournments and postponements thereof, to
consider and vote upon the approval and adoption of the Transaction Proposal,
consisting of the Merger Agreement and the transactions contemplated thereby,
including the approval of the Merger, the establishment of and the terms of the
CPR Trust, the CPR Certificate Distribution, the engagement of the Litigation
Trustees (including the terms of their engagement) for the CPR Trust, the terms
of the Commitment and the rights of the holders of CPR Certificates.
    
 
   
     This Proxy Statement/Prospectus is also being furnished by Ahmanson as a
prospectus in respect of the shares of Ahmanson Common Stock to be issued to
stockholders of Coast in connection with the Merger and, following consummation
of the Merger, in respect of any shares of Ahmanson Common Stock that are
issuable upon exercise of the Coast Stock Options that were outstanding as of
the Effective Date and replaced with options to acquire shares of Ahmanson
Common Stock ("Replacement Options"). Based on the 19,262,934 shares of Coast
Common Stock outstanding on the Record Date, the 1,020,426 shares of Coast
Common Stock issuable upon exercise of outstanding stock options and assuming
the exercise of all such stock options prior to the Effective Time and the
Exchange Ratio of 0.8082, up to approximately 16,393,012 Ahmanson Common Shares
will be issuable upon consummation of the Merger.
    
 
RECORD DATE, SOLICITATION AND REVOCABILITY OF PROXIES
 
   
     The Coast Board has fixed the close of business on December 23, 1997, as
the record date for determining the Coast stockholders entitled to receive
notice of and to vote at the Special Meeting. Only holders of record of Coast
Common Stock as of the Record Date are entitled to notice of and to vote at the
Special Meeting. As of the Record Date, 19,262,934 shares of Coast Common Stock
were issued and outstanding and held by 3,165 record holders. Holders of Coast
Common Stock are entitled to one vote on each matter considered and voted on at
the Special Meeting for each share of Coast Common Stock held of record at the
close of business on the Record Date. The presence, in person or by properly
executed proxy, of the holders of a majority of the shares of Coast Common Stock
entitled to vote at the Special Meeting is necessary to constitute a quorum at
the Special Meeting. For purposes of determining the presence of a quorum,
abstentions will be counted as shares present but shares represented by a proxy
from a broker or nominee indicating that such person has not received
instructions from the beneficial owner or other person entitled to vote shares
("broker nonvotes") will not be counted as shares present. Neither abstentions
nor broker non-votes will be counted as votes cast for purposes of determining
whether a proposal has received sufficient votes for approval.
    
 
     Proxies in the form accompanying this Proxy Statement/Prospectus are being
solicited by the Coast Board. Shares of Coast Common Stock represented by
properly executed proxies that have not been revoked will be voted in accordance
with the instructions indicated on the proxies. If no instructions are
indicated, such proxies will be voted "FOR" approval of the Transaction
Proposal, and as determined by the proxies named therein to any other matter
that may come before the Special Meeting or any adjournment or postponement
thereof including, among other things, a motion to adjourn or postpone the
Special Meeting to another time and/or place, for the purpose of soliciting
additional proxies or otherwise; provided, however, that no proxy which is voted
against the proposal to approve the Merger Agreement will be voted in favor of
any such adjournment or postponement for the purpose of soliciting additional
proxies.
 
     A Coast stockholder who has given a proxy may revoke it at any time prior
to its exercise at the Special Meeting by (a) giving written notice of
revocation to the Secretary of Coast, (b) properly submitting to Coast a duly
executed proxy bearing a later date or (c) voting in person at the Special
Meeting. All written notices of revocation and other communications with respect
to revocation of proxies should be addressed to Coast as follows: 1000 Wilshire
Boulevard, Los Angeles, California 90017, Attention: Secretary (Telephone: (213)
362-2000). A proxy appointment will not be revoked by death or supervening
incapacity of the stockholder
 
                                       20
<PAGE>   27
 
executing the proxy unless, before the shares are voted, notice of such death or
incapacity is filed with Coast's Secretary or other person responsible for
tabulating votes on behalf of Coast.
 
   
     The expense of soliciting proxies for the Special Meeting will be paid for
by Coast, although pursuant to the Merger Agreement, Ahmanson has agreed to
share equally with Coast all filing fees and printing expenses payable in
connection with the Registration Statements and this Proxy Statement/Prospectus.
In addition to the solicitation of stockholders of record by mail, telephone or
personal contact, Coast will be contacting brokers, dealers, banks and voting
trustees or their nominees who can be identified as record holders of Coast
Common Stock; such holders, after inquiry by Coast, will provide information
concerning the quantity of proxy and other materials needed to supply such
materials to beneficial owners, and Coast will reimburse them for the expense of
mailing the proxy materials to such persons.
    
 
   
     Coast has retained D. F. King & Co., Inc. ("D. F. King") to assist Coast in
connection with its communications with its stockholders with respect to, and to
provide other services to Coast in connection with, the Special Meeting. D. F.
King will receive a fee of $3,500 for its services and reimbursement of out-of-
pocket expenses in connection therewith. Coast has agreed to indemnify D. F.
King against certain liabilities arising out of or in connection with its
engagement.
    
 
VOTE REQUIRED
 
     Approval of the Transaction Proposal requires the affirmative vote of the
holders of a majority of the outstanding shares of Coast Common Stock. A vote of
the stockholders of Ahmanson is not required under the DGCL or the rules of the
NYSE for approval of the Merger Agreement or consummation of the transactions
contemplated thereby.
 
   
     As of the Record Date, Coast directors and executive officers and their
affiliates held approximately 0.91% of the outstanding shares of Coast Common
Stock entitled to vote at the Special Meeting. Such persons have indicated to
Coast that they intend to vote in favor of the Transaction Proposal. As of the
Record Date, Ahmanson held 100 shares of Coast Common Stock and directors and
executive officers of Ahmanson and their affiliates held no shares of Coast
Common Stock. See "The Merger -- Interests of Certain Persons in the Transaction
Proposal."
    
 
RECOMMENDATION OF COAST BOARD OF DIRECTORS
 
     For the reasons described in the section of this Proxy Statement/Prospectus
entitled "The Merger -- Reasons of Coast for the Merger," the Coast Board has
unanimously approved the Transaction Proposal and adopted the Merger Agreement.
The Coast Board believes that approval of the Transaction Proposal, consisting
of the Merger Agreement and the transactions contemplated thereby, including the
approval of the Merger, the establishment of and the terms of the CPR Trust, the
CPR Certificate Distribution, the engagement of the Litigation Trustees
(including the terms of their engagement) for the CPR Trust, the terms of the
Commitment and the rights of the holders of CPR Certificates, is in the best
interests of Coast and its stockholders and unanimously recommends that the
stockholders of Coast vote "FOR" approval of the Transaction Proposal. As a
result of the difficulty in establishing the value of the Litigation for
purposes of the Merger, the Coast Board determined that the ultimate value of
the Litigation should be retained by Coast's stockholders in connection with the
Merger and, thus, the Coast Board, as an integral part of its approval of the
Transaction Proposal, approved the establishment of the CPR Trust, the terms of
the CPR Certificates and the Commitment, the CPR Certificate Distribution and
related matters. See "The Merger -- Background of the Merger," "-- Reasons of
Coast for the Merger" and "-- Interests of Certain Persons in the Transaction
Proposal."
 
                                       21
<PAGE>   28
 
                                   THE MERGER
 
     The following information describes certain information pertaining to the
Merger and the other transactions contemplated by the Merger Agreement. This
description does not purport to be complete and is qualified in its entirety by
reference to the Appendices hereto, including the Merger Agreement and the form
of Commitment, which are attached as Appendices A and C hereto, respectively,
and are incorporated herein by reference. All stockholders are urged to read the
Appendices in their entirety.
 
GENERAL
 
     The Merger Agreement provides for a transaction in which Coast will merge
with and into Ahmanson. Ahmanson will be the surviving corporation of the
Merger. If the Transaction Proposal is approved at the Special Meeting, all
required governmental and other consents and approvals are obtained and all of
the other conditions to the obligations of the parties to consummate the Merger
are either satisfied or waived (if permitted), the CPR Distribution will be
effected and, immediately thereafter, the Merger will be consummated. A copy of
the Merger Agreement is set forth as Appendix A to this Proxy
Statement/Prospectus.
 
MERGER CONSIDERATION; EXCHANGE RATIO; COMMITMENT
 
  Merger Consideration; Exchange Ratio.
 
   
     The Merger Consideration pursuant to the Merger Agreement consists of (a)
the shares of Ahmanson Common Stock issuable in exchange for the outstanding
shares of Coast Common Stock pursuant to the Merger Agreement, and cash in lieu
of fractional share interests, and (b) the entering into of the Commitment by
Ahmanson. At the Effective Time, each share of issued and outstanding Coast
Common Stock, together with each associated Coast Right, will cease to be
outstanding and each such share (other than (i) certain shares, if any, held by
Coast, Ahmanson or their subsidiaries and (ii) Dissenters' Shares, if any) will
be converted into and exchanged for 0.8082 of a share of Ahmanson Common Stock
(with the appropriate number of Ahmanson Rights as provided in the Ahmanson
Rights Plan). In addition, Ahmanson will enter into the Commitment with the CPR
Trust at the Effective Time and effective at the Effective Time.
    
 
  Commitment.
 
   
     Ahmanson will enter into the Commitment, substantially in the form attached
hereto as Appendix C, with the CPR Trust at the Effective Time and effective at
the Effective Time. The Commitment will obligate Ahmanson to pay to the CPR
Trust from time to time an aggregate amount equal to the Commitment Amount. As
used in this Proxy Statement/Prospectus, the Commitment Amount means the
Litigation Proceeds minus the Reimbursements plus the Assumed Tax Benefit.
Litigation Proceeds means any and all cash payments (the "Cash Proceeds")
actually received by the Ahmanson Group pursuant to a final, non-appealable
judgment or a final settlement of the Litigation and the non-cash payments (the
"Non-Cash Proceeds"), if any, actually received by the Ahmanson Group pursuant
to a final, non-appealable judgment or a final settlement of the Litigation.
Reimbursements means (a) an amount equal to the Expense Fund plus (b) interest
on the portions of the Expense Fund withdrawn by the CPR Trust calculated from
the time of any such withdrawal at an annual interest rate equal to the
Reference Rate in effect from time to time plus 250 basis points, compounded
quarterly plus (c) the Assumed Tax Liability plus (d) in the event Litigation
Proceeds are required to be included in income for federal income tax purposes
in a taxable year prior to the year such proceeds are received in cash (either
because of the accrual of Cash Proceeds before the payment thereof or the time
required to liquidate Non-Cash Proceeds), interest at the Reference Rate plus
250 basis points from the date of such payment of taxes on such income to the
date of receipt of cash. The Expense Fund means an amount equal to $20 million,
less the expenses relating to the Litigation incurred and paid between August
31, 1997 and the Effective Date, which amount Ahmanson will deposit at the
Effective Time in a non-interest bearing demand-deposit account in the name of
the CPR Trust at Home Savings.
    
 
                                       22
<PAGE>   29
 
  Assumed Tax Liability; Assumed Tax Benefit; Tax Assumptions.
 
   
     Pursuant to the Commitment, regardless of any position taken by the
Ahmanson Group on any tax return or in any claim for refund with respect to the
receipt of the Litigation Proceeds or payments of the Commitment Amount (or of
the actual payment or actual receipt of any taxes with respect thereto), the
Assumed Tax Liability will, (i) if there is no Determination, be computed based
on the Tax Assumptions and (ii) if there is a Determination to the effect that
Litigation Proceeds are not includible in gross income in whole or in part, be
computed on the basis of the Tax Assumptions as such Tax Assumptions are
modified by such Determination. In addition, pursuant to the Commitment,
regardless of any position taken by the Ahmanson Group on any tax return or in
any claim for refund with respect to the receipt of the Litigation Proceeds or
payments of the Commitment Amount (or of the actual payment or actual receipt of
any taxes with respect thereto), the Assumed Tax Benefit will, (i) if there is
no Determination, be computed based on the Tax Assumptions and (ii) if there is
a Determination that no deduction is allowed (or that any allowed deduction is
limited) with respect to the application of Section 483(a) to payments of the
Commitment Amount, be computed on the basis of the Tax Assumptions as such Tax
Assumptions are modified by such Determination.
    
 
   
     As used herein, the "Assumed Tax Liability" means an amount equal to the
income (including franchise) tax liability of the Ahmanson Group (not giving
effect to any deductions attributable to payments of the Commitment Amount)
attributable to the receipt of the Litigation Proceeds computed in the manner
set forth above. As used herein, the "Assumed Tax Benefit" means an amount equal
to the tax benefit that would be allowed to the Ahmanson Group under Section
483(a) of the Code computed in the manner set forth above.
    
 
   
     As used herein, the "Tax Assumptions" means (i) if there is no
Determination, the following assumptions, or (ii) if there is a Determination,
the following assumptions as modified by such Determination:
    
 
          (a) The Litigation Proceeds will be includible in gross income as
     ordinary income in full.
 
   
          (b) Payments of the Commitment Amount will not be deductible except
     that Section 483(a) will apply to payments of the Commitment Amount, other
     than those allocable to CPR Certificates issued on exercise of employee
     options or otherwise in a transaction that is not a sale or exchange, and
     payments of the Commitment Amount will be deductible to the extent treated
     by Section 483(a) as interest expense; it being understood that it is not
     intended that the distribution of the CPR Certificates immediately prior to
     the Effective Time of the Merger will result in the characterization of
     such distribution as not constituting "a sale or exchange."
    
 
          (c) The income tax liability attributable to the assumed inclusion of
     all or a portion of the Litigation Proceeds in gross income as ordinary
     income and the benefit of any deduction assumed to be allowed under Section
     483(a) will be (i) the product of the amount of such income or deduction
     and the highest statutory rate of federal income tax applicable to
     corporations for the year in which the income is assumed to be included or
     the deduction is assumed to be realized plus (ii) the product of such
     income or deduction and the net combined marginal rate of state and local
     income (or franchise) tax of the relevant member or members of the Ahmanson
     Group for the year in which the income is assumed to be included and the
     deduction is assumed to be realized, net of the federal income tax benefit
     (calculated based on the rate in clause (i)) of such state or local income
     (or franchise) tax. The relevant member or members of the Ahmanson Group
     will be the member or members that is or are assumed to include the
     Litigation Proceeds in income or is or are assumed to be allowed a
     deduction under Section 483(a).
 
   
          (d) Any benefit from any deduction allowable to the Ahmanson Group
     under paragraph (c) of these Tax Assumptions for payments of the Commitment
     Amount will be assumed to be realized (i) when those payments are made to
     the extent those payments do not exceed the Litigation Proceeds included in
     income for the same taxable year, or (ii) otherwise when, taking into
     account other deductions or losses or credits of the Ahmanson Group, the
     deduction would reduce the tax otherwise payable or result in a refund of
     tax already paid.
    
 
                                       23
<PAGE>   30
 
   
          (e) Ahmanson will be entitled to rely on a written opinion (with a
     copy of such opinion to the Litigation Trustees) of either Sullivan &
     Cromwell or another nationally recognized law firm with expertise on the
     matter on which the opinion is sought that is selected by Ahmanson and
     (unless such law firm is principal outside tax counsel to Ahmanson)
     reasonably acceptable to the Litigation Trustees in determining whether
     there has been a Determination and in otherwise applying the Tax
     Assumptions to determine the income (including franchise) tax liability of
     the Ahmanson Group attributable to the receipt of the Litigation Proceeds
     and payments of the Commitment Amount and any tax benefit attributable to
     payments of the Commitment Amount.
    
 
   
          (f) If the Assumed Tax Liability or the Assumed Tax Benefit cannot be
     computed at the time of the receipt of the Cash Proceeds or a payment of
     the Commitment Amount because of the absence of information as to tax rates
     and other factors described in the definition of Assumed Tax Liability or
     the definition of Assumed Tax Benefit, as the case may be, the Ahmanson
     Group will compute a tentative Assumed Tax Liability or a tentative Assumed
     Tax Benefit, as the case may be, which are consistent with respect to the
     Assumed Tax Liability and the Assumed Tax Benefit, that in the reasonable
     opinion of the Ahmanson Group would protect the Ahmanson Group against any
     risk of loss. The payment of the Commitment Amount will be based on such
     tentative Assumed Tax Liability or such tentative Assumed Tax Benefit
     computation, as the case may be. As soon as feasible, but in no event later
     than 12 months after the end of the taxable year in which the Commitment
     Amount is paid, the Ahmanson Group will recompute the Assumed Tax Liability
     or the Assumed Tax Benefit, as the case may be, and pay to the CPR Trust
     any excess of the re-computed Commitment Amount over the Commitment Amount
     that was initially calculated plus interest for the period over which the
     payment was deferred at a rate of Home Savings' cost of funds as submitted
     monthly to the Federal Home Loan Bank of San Francisco (the "FHLBSF").
    
 
   
     Under the Commitment, a Determination that Litigation Proceeds are not
includible in gross income in whole or in part will be deemed to be made on the
earlier of (a) the date a final judicial determination to such effect, binding
upon Coast Federal (or its Successor) is made in the Litigation, (b) the date a
final agreement to which Ahmanson is a party with the federal government to such
effect is entered into at the direction of the Litigation Trustees as part of
the resolution of the Litigation or a related Internal Revenue Service ("IRS")
ruling to such effect issued to a member of the Ahmanson Group in connection
with such agreement (it being understood that the Ahmanson Group will be under
no obligation to seek such a ruling or refund or enter into such an agreement;
provided that if requested the Ahmanson Group will enter into such an agreement
if such agreement does not impose any liability or obligation whatsoever (other
than a standard settlement release relating only to the Litigation or other
related claims that Coast or Coast Federal or Coast's stockholders might have
been able to bring as of immediately prior to the Merger) on the Ahmanson Group
or adversely affect or restrict the conduct of its business or adversely affect
its tax posture with respect to other matters) and (iii) the effective date of a
law, regulation or IRS ruling to such effect that applies to Ahmanson or
taxpayers generally, and would be applicable to claims against the federal
government arising out of capital credits affected by Financial Institutions
Reform, Recovery and Enforcement Act of 1989 ("FIRREA"). Notwithstanding the
foregoing, no such Determination will be deemed to be made unless it is made
prior to the earlier of (x) thirty days before the date of filing by the
Ahmanson Group of the federal tax return for the taxable year in which the
Litigation Proceeds are assumed to be includible in gross income or (y) the
receipt by the Ahmanson Group of the Litigation Proceeds.
    
 
     Under the Commitment, a Determination with respect to the application of
Section 483(a) to payments of the Commitment Amount will be deemed to be made on
the earlier of (i) the date a final judicial determination to such effect
binding upon Ahmanson is made in the Litigation, (ii) the date a final agreement
to which Ahmanson is a party with the federal government to such effect is
entered into at the direction of the Litigation Trustees as part of the
resolution of the Litigation or a related IRS ruling to such effect issued to a
member of the Ahmanson Group in connection with such agreement (it being
understood that the Ahmanson Group will be under no obligation to seek such a
ruling or refund or enter into such an agreement; provided that if requested the
Ahmanson Group will enter into such an agreement if such agreement does not
impose any liability or obligation whatsoever (other than a standard settlement
release relating only to the Litigation
 
                                       24
<PAGE>   31
 
   
or other related claims that Coast or Coast Federal or Coast's stockholders
might have been able to bring as of immediately prior to the Merger) on the
Ahmanson Group or adversely affect or restrict the conduct of its business or
adversely affect its tax posture with respect to other matters) and (iii) the
effective date of a law, regulation or IRS ruling or a judicial decision to such
effect that applies to Ahmanson or taxpayers generally. A deduction shall be
considered allowed under Section 483(a) to the extent that a deduction is
allowed, in an amount up to the deduction calculated under Section 483(a), under
another substantially equivalent provision. Notwithstanding the foregoing, no
such Determination will be deemed to be made with respect to any payment of the
Commitment Amount unless such Determination is made prior to (i) the end of the
30th day following the delivery to the CPR Trust of the Ahmanson Certificate (as
defined herein) with respect to such payment of the Commitment Amount, if the
CPR Trust does not deliver a Notice of Objection within such 30-day period with
respect to such Ahmanson Certificate, or (ii) the Resolution (as defined herein)
with respect to such payment of the Commitment Amount, if the CPR Trust delivers
a Notice of Objection within such 30-day period with respect to such Ahmanson
Certificate. Subject to a Determination, the parties intend to treat a portion
of each payment of the Commitment Amount as interest to the extent such payment
is treated as interest under Section 483(a).
    
 
     Ahmanson will have no obligation to take or to refrain from taking any
action that would or could reduce the income tax liability of the Ahmanson Group
in respect of the Litigation Proceeds or obtain income tax benefits in respect
thereof on related payments.
 
  Payment Procedures With Respect to the Commitment Amount.
 
   
     Pursuant to the Commitment, within 10 days of the receipt by the Ahmanson
Group of any Litigation Proceeds, Ahmanson will deliver to the Litigation
Trustees a written notice (the "Proceeds Notice") specifying that such
Litigation Proceeds have been received and describing the type and amount of any
Non-Cash Proceeds received. Within 10 days of the delivery of the Proceeds
Notice, the Litigation Trustees will deliver to Ahmanson written instructions to
liquidate the Non-Cash Proceeds received. If so instructed, Ahmanson will then
liquidate or cause to be liquidated the Non-Cash Proceeds in accordance with the
instructions. As promptly as practicable but in no event later than 30 days
after the later of the receipt by Ahmanson of the Litigation Proceeds and the
liquidation by Ahmanson of Non-Cash Proceeds, Ahmanson will deliver to the
Litigation Trustees a certificate (the "Ahmanson Certificate") setting forth the
calculation of the portion of the Commitment Amount with respect to such
Litigation Proceeds, which Ahmanson Certificate will be valid and binding absent
manifest error. The Ahmanson Certificate will set forth each of the items
required under the Commitment to calculate the Commitment Amount, including the
amount of Litigation Proceeds and the amount of (and calculation of) each
component of the Reimbursements and the assumptions underlying the determination
of each item, and Ahmanson will attach to the Ahmanson Certificate financial and
other documentation reasonably sufficient to support each item and assumption
used to calculate the Commitment Amount. Within 30 days of delivery of the
Ahmanson Certificate, the CPR Trust will give written notice specifying whether
it agrees or objects (a "Notice of Agreement" and a "Notice of Objection,"
respectively) to the calculation in the Ahmanson Certificate of the portion of
the Commitment Amount with respect to such Litigation Proceeds (a "Notice of
Agreement" and a "Notice of Objection," respectively). If the CPR Trust delivers
a Notice of Agreement to the effect that it agrees with the calculation,
Ahmanson will then deliver the portion of the Commitment Amount with respect to
such Litigation Proceeds to the institutional trustee for the CPR Trust within 5
business days of such Notice of Agreement. If the CPR Trust delivers a Notice of
Objection within such 30-day period, Ahmanson will deliver such portion of the
Commitment Amount only upon a Resolution.
    
 
   
     If the CPR Trust delivers a Notice of Objection within such 30-day period,
the CPR Trust will as promptly as practicable following delivery of the Notice
of Objection deliver to Ahmanson a certificate (the "CPR Calculation
Certificate") setting forth its calculation of such portion of the Commitment
Amount. The CPR Calculation Certificate will set forth each of the items
required under the Commitment to calculate such portion of the Commitment
Amount, including the amount of Litigation Proceeds and the amount of (and
calculation of) each component of the Reimbursements and the assumptions
underlying the determination of each item, and the CPR Trust will attach to the
CPR Calculation Certificate financial and other
    
 
                                       25
<PAGE>   32
 
   
documentation reasonably sufficient to support each item and assumption used to
calculate such portion of the Commitment Amount. If Ahmanson does not agree with
the CPR Trust's calculation of such portion of the Commitment Amount, then
within 10 business days of the delivery by the CPR Trust of the CPR Calculation
Certificate, Ahmanson and the CPR Trust will submit the calculation of the
Commitment Amount to a mutually agreed upon independent certified public
accountant (the "Accountant"). If Ahmanson and the CPR Trust cannot agree upon
such independent certified public accountant, then the Commitment will provide
that the Accountant will be Price Waterhouse. The Accountant will be instructed
to determine whether the calculation set forth in the Ahmanson Certificate
contained manifest error and the Accountant will be instructed to conclude (i)
that the calculation set forth in the Ahmanson Certificate does not contain
manifest error so long as the calculation is a reasonable calculation of such
portion of the Commitment Amount based upon a reasonable interpretation of the
provisions of the Commitment and (ii) that the calculation set forth in the
Ahmanson Certificate contains manifest error if the calculation is not a
"reasonable calculation of such portion of the Commitment Amount based upon a
reasonable interpretation of the provisions of the Commitment." If the
Accountant determines (a) that the calculation set forth in the Ahmanson
Certificate did not contain manifest error, such portion of the Commitment
Amount will be as calculated in the Ahmanson Certificate or (b) that the
calculation set forth in the Ahmanson Certificate did contain manifest error,
the Accountant will recompute such portion of the Commitment Amount based upon
the formulae and definitions set forth in the Commitment and described herein
and the Accountant's calculation will be binding on both Ahmanson and Coast (in
either of case (a) or (b), a "Resolution"). In the event it is determined that
Ahmanson's calculation contained manifest error, in addition to such portion of
the Commitment Amount, Ahmanson will pay to the CPR Trust interest on such
portion of the Commitment Amount calculated from the date that the CPR Trust
delivered its Notice of Objection at an annual interest rate equal to the
Reference Rate plus 250 basis points. If the CPR Trust delivers a Notice of
Objection with respect to the payment of any portion of the Commitment Amount
within the applicable 30-day period and prior to the Resolution there is a
Determination to the effect that no deduction is allowed (or that any allowed
deduction is limited) in respect of payments of the Commitment Amount under
Section 483(a) in whole or in part, then Ahmanson will have the right to deliver
a new Ahmanson Certificate with a new calculation of that portion of the
Commitment Amount, and the previously delivered Ahmanson Certificate with
respect to that portion of the Commitment Amount will be considered null and
void; provided, however, that if Ahmanson delivers such a new Ahmanson
Certificate, Ahmanson will be required to pay interest on that portion of the
Commitment Amount from the date of delivery of the first Ahmanson Certificate
relating to such portion of the Commitment Amount to the date of delivery of the
new Ahmanson Certificate relating to such portion of the Commitment Amount at a
rate equal to Home Savings' cost of funds as submitted monthly to the FHLBSF.
The same procedures described in this paragraph for the resolution of any
disputes with respect to the calculation contained in an Ahmanson Certificate
will apply equally to the calculation in the new Ahmanson Certificate with
respect to such portion of the Commitment Amount.
    
 
  Due Date
 
   
     Pursuant to the Commitment, Ahmanson will pay to the CPR Trust the portion
of the Commitment Amount with respect to the relevant Litigation Proceeds (a) if
the CPR Trust does not deliver a Notice of Objection within the 30-day period
described above, within 5 business days of the earlier of the delivery of the
Notice of Agreement with respect to such Ahmanson Certificate or the 30th day
following the delivery by Ahmanson of such Ahmanson Certificate or (b) if the
CPR Trust does deliver a Notice of Objection with respect to such Ahmanson
Certificate within the 30-day period described above, within 5 business days of
the Resolution with respect to such portion of the Commitment Amount (each, a
"Due Date"). If Ahmanson does not pay such portion of the Commitment Amount by
the appropriate Due Date, Ahmanson will be obligated to pay to the CPR Trust
such portion of the Commitment Amount plus interest on such portion of the
Commitment Amount from the Due Date until the date such portion of the
Commitment Amount is paid, calculated at an annual interest rate equal to the
Reference Rate plus 250 basis points.
    
 
     Notwithstanding the foregoing, Ahmanson will not be obligated to pay the
Commitment Amount or any portion thereof at the Due Date and will be deemed not
to be in default of the Commitment and not to have violated its obligations
thereunder by virtue of not having paid the Commitment Amount or such portion
 
                                       26
<PAGE>   33
    
thereof (a) to the extent that Home Savings is not permitted due to regulatory
restrictions to distribute to Ahmanson the Litigation Proceeds and (b) if prior
to the Due Date, Ahmanson has delivered to the CPR Trust a certificate (an
"Officer's Certificate") from the chief financial officer of Home Savings
specifying that portion of the Litigation Proceeds that cannot be paid due to
regulatory restrictions and the applicable law, regulation or other action of a
regulatory authority that is the source of the regulatory restrictions
preventing the distribution by Home Savings and either (i) an opinion of outside
counsel substantially to the effect that the distribution by Home Savings of the
Litigation Proceeds or the applicable portion thereof, as the case may be, would
result in the violation of the applicable law, regulation or other action of a
regulatory authority that is the source of the regulatory restrictions
preventing the distribution by Home Savings (an "Opinion of Counsel") or (ii)
either (A) a copy of written documentation from the applicable regulatory
authority to the effect that Home Savings may not distribute the Litigation
Proceeds, or any portion thereof, to Ahmanson, or (B), prior to the expiration
of any applicable prior notice or application period following Home Savings'
submission to the applicable regulatory authority of a notice or application for
approval of a distribution of the Litigation Proceeds to Ahmanson, an officer's
certificate from the chief financial officer of Home Savings certifying that
Home Savings has submitted such a notice or application and that Home Savings
has not received any written documentation from such regulatory authority to the
effect that Home Savings may make such distribution (in either of case (A) or
(B), a "Regulatory Document"). Under the Commitment, Ahmanson will be entitled
not to pay the Commitment Amount or any portion thereof as specified in the
immediately preceding sentence with the consequences specified in the
immediately preceding sentence for a period of two years from the Due Date on
which the Commitment Amount or such portion thereof would otherwise have been
payable so long as (i) Home Savings continues not to be permitted to distribute
such portion of the Litigation Proceeds to Ahmanson due to regulatory
restrictions and (ii) Ahmanson delivers on a quarterly basis beginning with the
first full fiscal quarter following the Due Date an Officer's Certificate and
either an Opinion of Counsel or a Regulatory Document. After this two-year
period, if Ahmanson does not pay that portion of the Commitment Amount that is
due, Ahmanson will be in default of the Commitment.
    
 
   
     Notwithstanding the foregoing, under the Commitment Agreement, Ahmanson
will be deemed to be in default of the Commitment Agreement at any time
specified above when payment of the Commitment Amount or such portion thereof
would otherwise be due but when Ahmanson would be entitled not to make such
payment and would be deemed not to be in default due to the regulatory
restrictions described above if, at such time, there exists a default under any
mortgage, indenture or instrument under which there may be issued or by which
there may be secured or evidenced any indebtedness for money borrowed by
Ahmanson (but not including any such mortgage, indenture or instrument pursuant
to which the creditor's remedy is limited to foreclosure of collateral), whether
such indebtedness exists at the time of the Commitment Agreement or is created
thereafter, which default constitutes a failure to pay principal of such
indebtedness in an amount exceeding $50 million when due and payable after the
expiration of any applicable grace period with respect thereto or will have
resulted in such indebtedness in an aggregate principal amount exceeding $50
million becoming or being declared due and payable prior to the date on which it
would otherwise have become due and payable, without such indebtedness being
discharged, or such acceleration having been rescinded or annulled, within a
period of 35 days after the occurrence of the event that gave rise to such
default provided that any such event of default will not be deemed to have
occurred so long as Ahmanson is contesting the validity thereof in good faith by
appropriate proceedings.
    
 
  Ahmanson Litigation.
 
     Ahmanson also has litigation pending against the U.S. government involving
the regulatory capital treatment of certain supervisory goodwill, which claims
are similar to the Litigation. Ahmanson intends to pursue that litigation solely
in the best interests of its stockholders and without regard to any possible
impact on the Litigation or the value of the CPR Certificates.
 
  No Ahmanson Responsibility for the Litigation.
 
   
     The Litigation will remain a contingent asset of Coast Federal upon
effectiveness of the Merger and will thus become a contingent asset of Ahmanson
as successor to Coast and as parent company of Coast Federal.
    
 
                                       27
<PAGE>   34
 
   
As provided in the CPR Trust Agreement, the Litigation will be solely under the
control of the Litigation Trustees and Ahmanson will not participate in or have
any responsibility for any decisions regarding the administration of the
Litigation. The terms of the CPR Trust Agreement and the Commitment will
explicitly provide that Ahmanson, Home Savings, their affiliates, officers,
directors, employees and agents have no liability to the holders of the CPR
Certificates. Without limiting the generality of the foregoing, none of the
holders of the CPR Certificates, the Trust and the trustees of the Trust have
any right to enforce, institute or maintain any suit, action or proceeding
against Ahmanson, Home Savings, its affiliates, officers, directors, employees
or agents relating to the formation of the CPR Trust, the entering into of the
Commitment, the distribution of the CPR Certificates, the Litigation or the
performance by the Litigation Trustees of their duties as Litigation Trustees.
Notwithstanding the foregoing, the CPR Trust, or the Litigation Trustees on
behalf of the CPR Trust, may enforce, institute or maintain a suit, action or
proceeding against Ahmanson for breach of the Commitment or (as successor to
Coast) of the CPR Trust Agreement or failure to deliver any CPR Certificate when
due or return to the CPR Trust for cancellation any CPR Certificate required to
be returned or against Ahmanson for failure to deposit the Expense Fund at the
Effective Time or against Home Savings for breach of any depository relationship
obligations it may have with respect to the Expense Fund (and except to the
extent that Ahmanson succeeds to the obligations of Coast under the CPR Trust
Agreement).
    
 
     The Commitment will provide that except as expressly set forth in the
Commitment (or in any other documents to which Ahmanson has succeeded as a
matter of law), Ahmanson will have no other obligations to the CPR Trust, the
Litigation Trustees or the holders of CPR Certificates. Without limiting the
generality of the foregoing and except as provided in the Merger Agreement,
Ahmanson will have no obligation to advance funds to the CPR Trust, the
Litigation Trustees or the holders of CPR Certificates.
 
BACKGROUND OF THE MERGER
 
   
     The Coast Board and the management of Coast have recognized that in order
to remain competitive in the consolidating financial services industry, it is
essential to provide a broader array of consumer and business banking products,
to achieve economies of scale and to continue Coast's expansion of the variety
of products that it offers to customers. In an effort to address these concerns,
from time to time in the last year, Coast and its financial advisors have had
conversations with other financial institutions regarding possible merger
scenarios, and the Coast Board has discussed certain of these possibilities,
with the assistance of Goldman Sachs and outside counsel. At various times,
Coast or its financial advisors held preliminary conversations with third
parties regarding a possible business combination, none of which discussions
resulted in any offer or agreement. In early 1997, Coast and its advisors had
significant discussions with one potential acquiror; prior to reaching any
agreement, however, that party terminated discussions for strategic reasons
unrelated to Coast, and subsequently indicated that it was not interested in an
acquisition of Coast at that time.
    
 
     Also in the last year, the Coast Board and management discussed the
possibility of issuing securities relating to the Litigation to the Coast
stockholders, either in connection with a merger or in the absence of a merger.
 
     In late August 1997, Ray Martin, Chairman and Chief Executive Officer of
Coast, arranged an informal meeting with Charles R. Rinehart, Chairman and Chief
Executive Officer of Ahmanson. Prior to this meeting, at Ahmanson's request
Goldman Sachs provided Ahmanson with certain publicly available financial
information. Robert L. Hunt II, Coast's Chief Operating Officer, and Kevin
Twomey, Ahmanson's Chief Financial Officer, also attended this meeting, during
which the parties discussed a possible business combination between Coast and
Ahmanson. Over the course of subsequent informal meetings, Mr. Martin, Mr. Hunt,
Mr. Twomey and selected officers of Coast and Ahmanson discussed the structure
of a potential merger, including Coast's desire to preserve the potential value
of the Litigation for the benefit of Coast stockholders, and Ahmanson's
agreement to that approach so that it did not have to value or pay Coast
stockholders for the Litigation.
 
     During early September, Mr. Martin and Mr. Rinehart negotiated the
principal business terms of the Merger. On September 17, 1997, they reached
tentative agreement on the exchange ratio, subject to
 
                                       28
<PAGE>   35
 
agreement on satisfactory arrangements with respect to securities relating to
the Litigation to be issued to Coast stockholders, satisfactory completion of
due diligence reviews of the business and assets of the respective companies and
approvals by the Coast Board and Ahmanson's Board of Directors (the "Ahmanson
Board"). The contemplated exchange ratio was 0.81 of a share of Ahmanson Common
Stock for each share of Coast Common Stock, assuming that the closing price of
Ahmanson Common Stock was $57.00 or less on the last trading day immediately
preceding execution of a Merger Agreement. If the price of a share of Ahmanson
Common Stock at that time was in excess of $57.00, the proposed exchange ratio
would be reduced so that each share of Coast Common Stock would be exchanged for
the number of shares of Ahmanson Common Stock as would then have a market value
of approximately $46.17. In addition, it was contemplated that Coast
stockholders would receive securities relating, in the aggregate, to 100% of the
net after-tax value of any damage award in or settlement of the Litigation.
 
     On September 18, 1997, Coast and Ahmanson entered into a customary
confidentiality agreement containing a "standstill" provision pursuant to which
each party agreed, for a period of two years following the date of such
agreement, not to take certain actions relating to an acquisition of the other
party's assets or securities without such other party's consent. Following the
execution and delivery of the confidentiality agreement, each of Coast and
Ahmanson began its due diligence review of the other.
 
   
     In preparation for a September 19, 1997 meeting of the Coast Board to
discuss the status of discussions with Ahmanson, and in view of the retention of
special mergers and acquisition counsel to advise Coast and the Coast Board as
an entirety, at the request of several non-management directors Coast's regular
outside counsel was designated to meet separately with the non-management
directors. At the September 19, 1997 special telephonic meeting of the Coast
Board, Mr. Martin described the status of discussions between the parties.
Coast's senior management and Goldman Sachs discussed the reasons for the Merger
and the potential benefits to Coast and its stockholders from the Merger, and
also discussed the strategic and business rationale and financial aspects of the
Merger. Coast's special merger and acquisitions counsel reviewed the directors'
obligations in connection with the possible Merger with the entire Coast Board
and Coast's regular outside counsel reviewed such obligations separately with
the non-management directors.
    
 
     At a September 21, 1997 special meeting of the Coast Board, the Coast Board
was provided with additional details regarding the history and status of the
discussions with Ahmanson. At that meeting, Goldman Sachs made a presentation
regarding the proposed financial terms of the Merger and Coast's legal advisors
described, and the Coast Board discussed, the terms of the draft Merger
Agreement that had been proposed by Ahmanson and the potential terms of the
securities relating to the Litigation. In addition, the Coast Board evaluated
with management, Goldman Sachs and counsel Coast's strategic alternatives to the
Merger, including the possibility of (i) seeking to merge with some other
banking organization, (ii) remaining independent and seeking to merge with
Ahmanson or another banking organization at a later date and (iii) remaining
independent indefinitely. The Coast Board also discussed with management,
counsel and Goldman Sachs the factors discussed below under "-- Reasons of Coast
for the Merger," and the non-management directors discussed separately with
counsel the selection, role and compensation of the Litigation Trustees.
 
     During the period from September 18, 1997 to the meeting of the Coast Board
on October 5, 1997, the Merger Agreement and the terms of the CPR Certificates
were drafted, discussed and negotiated by Coast, Ahmanson and their respective
representatives.
 
   
     During meetings between Coast, Ahmanson and their counsel on Friday,
October 3, 1997, all material issues with respect to the Merger Agreement
(including the terms of the CPR Certificates) were resolved. In view of the fact
that the closing price of Ahmanson Common Stock on October 3 was $57.125, the
Exchange Ratio was set at 0.8082 of a share of Ahmanson Common Stock for each
share of Coast Common Stock, representing a market value of $46.17 per share of
Coast Common Stock based on the October 3, 1997 closing price of Ahmanson Common
Stock. The Exchange Ratio of 0.8082 was fixed on October 5, 1997, the date of
the Merger Agreement, and does not adjust to preserve the $46.17 value.
Accordingly, the market value of the shares of Ahmanson Common Stock to be
received in the Merger based on the Exchange Ratio may be less than or greater
than $46.17.
    
 
                                       29
<PAGE>   36
 
     On October 5, 1997, the Ahmanson Board met and approved the Merger
Agreement and the transactions contemplated thereby. Later that day, at a
special meeting of the Coast Board with all members of the Coast Board present,
Mr. Martin and senior management of Coast again presented the reasons for and
the potential benefits of the Merger. Coast's legal advisors reviewed the terms
of the Merger Agreement, including the terms of the CPR Trust and the CPR
Certificates, and Goldman Sachs updated its presentation regarding the financial
terms of the Merger and rendered its opinion that the Consideration (as defined
in "-- Opinion of Coast's Financial Advisor") is fair, from a financial point of
view, to holders of Coast Common Stock. See "-- Opinion of Coast's Financial
Advisor." After discussion of the Merger Agreement and of the factors discussed
below under "-- Reasons of Coast for the Merger," the Coast Board unanimously
approved and authorized the execution of the Merger Agreement and approved the
transactions contemplated thereby, including the Merger, the establishment of
and the terms of the CPR Trust, the CPR Certificate distribution, the engagement
of the Litigation Trustees (including the terms of their engagement), the terms
of Ahmanson's obligation to pay the Commitment Amount to the CPR Trust and the
rights of the holders of the CPR Certificates.
 
REASONS OF COAST FOR THE MERGER
 
     In determining to approve the Merger Agreement and the transactions
contemplated thereby and to recommend approval of the Transaction Proposal by
the Coast stockholders, the Coast Board reviewed and considered a number of
factors, including, without limitation, the following:
 
          (a) Certain Financial and Other Information Concerning Coast. The
     Coast Board took into account its familiarity with and review of the
     financial condition, results of operations, cash flow, earnings and
     business of Coast both on a historical and a prospective basis.
 
          (b) Advice of Financial Advisor and Fairness Opinion. The Coast Board
     considered the financial presentations of Goldman Sachs on September 21 and
     October 5, 1997, and the opinion of Goldman Sachs rendered to the Coast
     Board on October 5, 1997 that the Consideration is fair, from a financial
     point of view, to the holders of Coast Common Stock. See "-- Opinion of
     Coast's Financial Advisor."
 
          (c) Economic Terms of the Merger. The Coast Board considered that the
     terms of the Merger are beneficial to Coast stockholders in that Coast
     stockholders will both (i) become stockholders of a combined institution
     that will be a leading financial institution in California and (ii) retain
     a 100% interest in an amount equal to the value of any proceeds (after
     expenses and taxes calculated according to certain assumptions) of the
     Litigation.
 
          (d) The CPR Certificates. The Coast Board took into account the terms
     of the CPR Certificates, including the fact that the CPR Certificates are
     expected to be freely tradable. In this regard, the Coast Board also took
     into account that although there can be no assurance as to the development
     of a market for the CPR Certificates, efforts will be made to list the CPR
     Certificates on the NASDAQ National Market System and that a reasonably
     liquid market appeared to exist for somewhat similar securities issued by
     California Federal Bank, A Federal Savings Bank, with similar claims
     against the federal government.
 
          (e) Other Terms of the Merger Agreement. The Coast Board considered
     the terms of the Merger Agreement, including the fact that the Coast
     Board's obligation under the Merger Agreement to recommend the Merger to
     the Coast stockholders and the Coast Board's obligations not to solicit, or
     to provide information or engage in discussions in connection with, other
     proposals to acquire Coast, are both subject to the Coast Board's fiduciary
     duties to the Coast stockholders in the event that the Coast Board were to
     conclude in good faith that another unsolicited acquisition proposal was
     superior to the Merger. The Coast Board also took into account that if the
     Merger Agreement were terminated under certain conditions and Coast or any
     of its subsidiaries then entered into a definitive agreement with respect
     to a merger or acquisition with a third party within 12 months of
     termination, Coast would be required to pay a $35 million termination fee
     to Ahmanson.
 
                                       30
<PAGE>   37
 
          (f) Certain Financial and Other Information Concerning Ahmanson. The
     Coast Board considered information regarding (i) the strategy, business,
     operations, earnings and financial condition of Ahmanson on both an
     historical and a prospective basis and (ii) the historical stock price
     performance of Ahmanson Common Stock, in each case based in part on
     presentations by Goldman Sachs at the September 21 and October 5, 1997
     meetings. See "-- Opinion of Coast's Financial Advisor."
 
          (g) Opportunities for Efficiencies and Cost Savings. The Coast Board
     took into account that, although no assurances can be given, there were
     likely to be anticipated cost savings, operating efficiencies and synergies
     available to Ahmanson from the Merger and possible enhanced revenue
     opportunities.
 
          (h) Alternatives to the Merger Agreement. The Coast Board considered
     strategic alternatives to enhance stockholder value, including the
     possibility of (i) seeking to merge with some other banking organization,
     (ii) remaining independent and seeking to merge with Ahmanson or another
     banking institution at a later date and (iii) remaining independent
     indefinitely.
 
          (i) Tax Treatment of the Transaction. The Coast Board took into
     account the anticipated tax treatment of the Merger. See "-- Certain
     Federal Income Tax Consequences."
 
          (j) Regulatory Approvals. The Coast Board took into account its
     belief, after consultation with its legal counsel, that the regulatory
     approvals necessary to consummate the Merger could be obtained. See
     "-- Regulatory Matters."
 
   
          (k) Economic and Competitive Environment. The Coast Board considered
     the operating environment for Coast, including, but not limited to, the
     continuing consolidation and increasing competition in the thrift, banking
     and financial services industries in California and nationally and the
     prospect for further changes in these industries and the importance of
     operational scale and financial resources to remaining competitive in the
     long term.
    
 
          (l) Size and Competitiveness of Combined Company. The Coast Board took
     into account its assessment that the combined company resulting from the
     Merger might better serve the convenience and needs of its customers and
     the communities it serves as a result of being a substantially larger
     financial institution, thereby potentially affording access to greater
     financial, managerial and technological resources and an ability to offer
     an expanded range of products and services.
 
          (m) Due Diligence Review. The Coast Board considered the results of
     the due diligence investigations conducted by Coast management and its
     advisors, including, among other things, assessments of Ahmanson's credit
     policies, asset quality, adequacy of loan loss reserves and interest rate
     risk.
 
          (n) Impact on Coast's Constituencies. The Coast Board considered the
     general impact the Merger would have on the various constituencies served
     by Coast, including its employees. The Coast Board took into account the
     potential for a substantial number of Coast employees to retain their
     current positions or to obtain employment with Ahmanson. The Coast Board
     also took into account Ahmanson's favorable ratings under the Community
     Reinvestment Act.
 
     In reaching its determination to approve and recommend the Merger, the
Coast Board did not assign any relative or specific weights to the various
factors considered by it, and individual directors may have given differing
weights to different factors. The foregoing discussion of the information and
factors considered by the Coast Board is not intended to be exhaustive but is
believed to include all material factors considered by the Coast Board.
 
     BASED ON THE FOREGOING, THE COAST BOARD BELIEVES THAT THE MERGER IS IN THE
BEST INTEREST OF COAST AND ITS STOCKHOLDERS AND UNANIMOUSLY RECOMMENDS THAT
COAST STOCKHOLDERS VOTE "FOR" APPROVAL OF THE TRANSACTION PROPOSAL.
 
                                       31
<PAGE>   38
 
OPINION OF COAST'S FINANCIAL ADVISOR
 
     Goldman Sachs was retained by Coast to act as its financial advisor in
connection with the Merger and to render an opinion as to the fairness from a
financial point of view of the consideration to be received by Coast or its
stockholders pursuant to the Merger. At meetings of the Coast Board held on
September 21, 1997 and October 5, 1997, Goldman Sachs made presentations on
financial aspects of the Merger and at the October 5, 1997 meeting delivered to
the Coast Board its written opinion dated as of such date to the effect that, as
of the date of such opinion, based on and subject to the matters set forth in
such opinion, the consideration of 0.8082 of a share of Ahmanson Common Stock
and the proportionate interest in an amount equal to any recovery on the
Litigation (the "Consideration") to be received by the holders of shares of
Coast Common Stock pursuant to the Merger Agreement is fair from a financial
point of view to such holders. Goldman Sachs has confirmed its October 5, 1997
opinion as of the date of this Proxy Statement/Prospectus by delivery of its
written opinion to the Coast Board, dated the date of this Proxy
Statement/Prospectus.
 
     Goldman Sachs has consented to the inclusion of its opinion, dated the date
hereof, in this Proxy Statement/Prospectus (the "Goldman Sachs Opinion"). The
Goldman Sachs Opinion is addressed to the Coast Board and does not constitute a
recommendation to any of the stockholders of Coast as to how such stockholders
should vote with respect to the Merger.
 
     THE FULL TEXT OF THE GOLDMAN SACHS OPINION, DATED THE DATE OF THIS PROXY
STATEMENT/PROSPECTUS, WHICH SETS FORTH THE ASSUMPTIONS MADE, PROCEDURES
FOLLOWED, MATTERS CONSIDERED AND LIMITS ON THE REVIEW UNDERTAKEN, IS ATTACHED AS
APPENDIX D TO THIS PROXY STATEMENT/PROSPECTUS AND IS INCORPORATED HEREIN BY
REFERENCE. THE DESCRIPTION OF THE GOLDMAN SACHS OPINION SET FORTH HEREIN IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO APPENDIX D. COAST STOCKHOLDERS ARE
URGED TO READ THE GOLDMAN SACHS OPINION IN ITS ENTIRETY.
 
     Goldman Sachs is a nationally recognized investment banking firm and was
selected by Coast based on the firm's reputation and experience in investment
banking in general, its recognized expertise in the valuation of businesses and
because of its familiarity with, and prior work for, Coast. As part of its
investment banking business, Goldman Sachs is continually engaged in the
valuation of businesses and their securities in connection with mergers and
acquisitions, negotiated underwritings, competitive biddings, secondary
distributions of listed and unlisted securities, private placements and
valuations for estate, corporate and other purposes.

   
     In connection with rendering its opinion dated October 5, 1997, Goldman
Sachs, among other things: (i) reviewed the Merger Agreement; (ii) reviewed
Annual Reports to Stockholders and Annual Reports on Form 10-K of Coast and
Ahmanson for the five years ended December 31, 1996; (iii) reviewed certain
interim reports to stockholders and Quarterly Reports on Form 10-Q of Coast and
Ahmanson; (iv) reviewed certain other communications from Coast and Ahmanson to
their respective stockholders; (v) reviewed certain internal financial analyses
and forecasts for Coast and Ahmanson prepared by their respective managements,
including forecasts of certain cost savings (the "Synergies") expected by
Ahmanson to be achieved as a result of the Merger and including share repurchase
and capital management policies expected to be fulfilled by Ahmanson following
the Merger; (vi) held discussions with members of the senior managements of
Coast and Ahmanson regarding the past and current business operations,
regulatory relationships, financial condition and future prospects of their
respective companies and each senior management's assessment of the Synergies;
(vii) reviewed the reported price and trading activity for the Coast Common
Stock and the Ahmanson Common Stock; (viii) compared certain financial and stock
market information for Coast and Ahmanson with similar information for certain
other companies the securities of which are publicly traded; (ix) reviewed the
financial terms of certain recent business combinations in the thrift industry
specifically and in other industries generally; and (x) performed such other
studies and analyses as Goldman Sachs deemed appropriate.
    
 
     In connection with rendering the Goldman Sachs Opinion, as set forth
therein, Goldman Sachs relied without independent verification upon the accuracy
and completeness of all the financial and other information reviewed by it and
has assumed such accuracy and completeness for purposes of such opinion.
 
                                       32
<PAGE>   39
 
With Coast's consent, Goldman Sachs assumed that the financial forecasts of
Coast and Ahmanson (including, without limitation, the Synergies, the financial
impact of the anticipated repurchase of Ahmanson Common Stock and capital
management policies and the projections regarding under-performing and non-
performing assets and net charge-offs) were reasonably prepared on a basis
reflecting the best currently available judgments and estimates of Coast and
Ahmanson, and that such forecasts would be realized in the amounts and at the
times contemplated thereby. Goldman Sachs is not an expert in the evaluation of
loan and lease portfolios for purposes of assessing the adequacy of the
allowances for losses with respect thereto, and assumed, with Coast's consent,
that such allowances for each of Coast and Ahmanson are in the aggregate
adequate to cover all such losses. In addition, Goldman Sachs has not reviewed
individual credit files nor has it made an independent evaluation or appraisal
of the assets and liabilities of Coast or Ahmanson or any of their respective
subsidiaries and has not been furnished with any such evaluation or appraisal.
Goldman Sachs has also assumed, with Coast's consent, that obtaining any
necessary regulatory approval and third party consents for the Merger will not
have an adverse impact on Coast, Ahmanson or the combined company pursuant to
the Merger.
 
     Goldman Sachs is not a legal expert and has not expressed any opinion as to
the potential outcome or value of the Litigation and has not expressed any
opinion as to the prices at which the CPR Certificates may trade if and when
they are issued.
 
   
     The following is a summary of the material financial analyses presented by
Goldman Sachs to the Coast Board on September 21, 1997 and October 5, 1997 in
connection with providing its opinion to the Coast Board on October 5, 1997, and
does not purport to be a complete description of the analyses performed by
Goldman Sachs. Goldman Sachs used substantially the same types of financial
analyses in preparing its written opinion dated as of the date of this Proxy
Statement/Prospectus as it used in providing its opinion dated as of October 5,
1997 and also reviewed the Ahmanson Registration Statement on Form S-4, the CPR
Trust Registration Statement on Form S-4 and this Proxy Statement/Prospectus.
    
 
     Summary of Terms of Proposed Transaction. Goldman Sachs reviewed the terms
of the proposed Merger, including the form of Consideration offered, the
expected method of accounting and the Notional Value (defined below) to be
received for each share of Coast Common Stock pursuant to the Merger. The
Notional Value is calculated on the basis of (i) the Exchange Ratio, (ii) the
closing price of Ahmanson Common Stock as of October 3, 1997 and (iii) the
implied value of the Litigation.

   
     Goldman Sachs indicated that the Consideration offered in connection with
the Merger consists of Ahmanson Common Stock and proportionate interests in an
amount equal to the net after-tax proceeds, if any, that may be received in the
Litigation, which will be represented by the CPR Certificates. The anticipated
method of accounting for the Merger is the purchase method. Goldman Sachs stated
that the notional price per share of Coast Common Stock for the Merger as of
October 3, 1997 was $59.10 (the "Notional Value"), which amount represents the
sum of (i) the product of the Exchange Ratio and the $57.125 closing price of
the Ahmanson Common Stock on October 3, 1997, or $46.17 (the "Stock
Consideration") and (ii) the implied value per share of Coast Common Stock of
the Litigation (as described below), or $12.93. The Notional Value is
necessarily dependent on the closing prices of the Ahmanson Common Stock and of
the Goodwill Certificates (defined below) issued by California Federal Bank at a
specific time. Based upon the Notional Value, the aggregate Consideration to be
received by holders of Coast Common Stock in the Merger would be approximately
$1.162 billion.
    
 
     In addition to reviewing the Notional Value resulting from the Merger, the
analyses described indicated values of the Stock Consideration resulting from
the Merger expressed as multiples of Coast's earnings for the 12 months ended
June 30, 1997 and of estimates of Coast's 1997 and 1998 earnings, as well as
multiples of various measures of Coast book value. In performing these analyses,
Goldman Sachs used estimates based upon IBES earnings estimates and earnings
estimates prepared by Coast management. IBES is a data service that monitors and
publishes compilations of earnings estimates by selected research analysts
regarding companies of interest to institutional investors. Using these
analyses, the Stock Consideration as of October 3, 1997 reflected (i) a multiple
of 19.7 times Coast earnings per share for the 12 months ending June 30, 1997,
(ii) multiples of 17.4 and 17.0 times the IBES median estimate and the Coast
management estimate,
 
                                       33
<PAGE>   40
 
respectively, of Coast's 1997 earnings, and (iii) multiples of 14.7 and 12.6
times the IBES median estimate and the Coast management estimate of Coast's 1998
earnings, respectively. The indicated value of the Stock Consideration as of
October 3, 1997 also reflected (i) a multiple of 2.0 times Coast's stated book
value as of June 30, 1997 and (ii) a multiple of 2.0 times Coast's tangible book
value as of June 30, 1997.
 
     Valuation of Contingent Payment Rights. The possibility exists that Coast
may receive a material payment from the federal government as compensation for
damages related to the Litigation. In attempting to consider the value to
stockholders of any such payment, Goldman Sachs considered the current trading
value of certain publicly traded certificates (the "Goodwill Certificates")
issued by California Federal Bank ("California Federal") in July 1995.
California Federal agreed to pay to holders of the Goodwill Certificates, which
were issued to all of its then existing shareholders, a portion of any damages
which California Federal might receive in relation to its supervisory goodwill
lawsuit, a lawsuit which raises similar issues to those involved in the
Litigation (although there can be no assurance that the Coast and California
Federal litigation will be resolved in a similar manner). The market value of
these Goodwill Certificates, divided by the supervisory goodwill required to be
written off by California Federal, provides a percentage basis upon which it is
possible to impute a value to other companies' regulatory capital claims
(including that of Coast) by multiplying the supervisory goodwill or capital
credits required to be written off, phased out or excluded from regulatory
capital by such companies by such percentage. However, the actual damages that
may be awarded to a plaintiff institution may differ significantly from the
amount of supervisory goodwill or capital credits required to be written off,
phased out or excluded from regulatory capital, as the case may be, because a
court would take into account the actual damages suffered by a plaintiff thrift
as a result of the required phase-out or exclusion.
 
     Based on the $21.125 per certificate closing price of the Goodwill
Certificates on October 3, 1997, the ratio of the market value of the California
Federal legal claim to the aggregate amount of supervisory goodwill related
thereto was 87.5%. Applying this ratio to Coast's regulatory capital credit of
approximately $299 million implied a market value of $261 million, or $12.93 per
share of Coast Common Stock, attributable to the Litigation. However, although
the trading price of the Goodwill Certificates provides a likely indicator of
the market value of the Coast Common Stock attributable to the Litigation, there
is no assurance that the CPR Certificates will trade at $12.95.
 
     Selected Transaction Analysis. Goldman Sachs reviewed certain information
relating to 9 thrift institution mergers in California, announced since January
1, 1994 and prior to October 5, 1997, in which the aggregate consideration paid
was in excess of $100 million (the "California Thrift Mergers"). The California
Thrift Mergers consist of (buyer/seller): Golden State/CENFED Financial, Bay
View Capital/America First, Washington Mutual/Great Western,
Temple-Inland/California Financial, MacAndrews & Forbes/Cal Fed Bancorp,
Washington Mutual/Keystone Holdings, MacAndrews & Forbes/SFFed, First
Interstate/ Sacramento Savings and MacAndrews & Forbes/First Nationwide. Such
analysis indicated that the median multiples of consideration paid to the latest
12 month earnings per share, current year earnings, next year earnings, book
value and tangible book value for the California Thrift Mergers were 14.9, 12.5,
11.5, 1.6 and 1.6 times, respectively, compared to multiples of the indicated
value of the Stock Consideration as of October 3, 1997 of (i) 19.7 times Coast
earnings per share for the 12 months ending June 30, 1997, (ii) 17.4 and 17.0
times the IBES median estimate and the Coast management estimate, respectively,
of Coast 1997 earnings, (iii) 14.7 and 12.6 times the IBES median estimate and
the Coast management estimate of Coast 1998 earnings, (iv) 2.0 times Coast's
stated book value as of June 30, 1997, and (v) 2.0 times Coast's tangible book
value as of June 30, 1997.
 
     Selected Company Analysis. Based on publicly available information and IBES
earnings estimates, Goldman Sachs reviewed and compared (both including and
excluding the value attributable to the applicable company's regulatory capital
litigation) actual and estimated selected financial, operating and stock market
information and financial ratios of Coast and Ahmanson, a group of 2 California
large-capitalization thrift institutions consisting of Washington Mutual and
Golden West Financial (the "Selected California Large-Cap Thrifts"), a group of
4 California mid-capitalization thrift institutions consisting of Golden State,
Downey Financial, FirstFed Financial and Bay View Capital (the "Selected
California Mid-Cap Thrifts"), and a group of 6 selected non-California
large-capitalization thrift institutions consisting of Charter One
 
                                       34
<PAGE>   41
 
Financial, GreenPoint Financial, Dime Bancorp, Washington Federal, Bank United
and People's Heritage (the "Selected Non-California Large-Cap Thrifts"). Such
information and ratios included, among other things, equity market
capitalization, price-earnings ratios, price to book value ratios, price to
tangible book value ratios, earnings growth and certain profitability data.
 
     Goldman Sachs noted for the Coast Board that, among other things, and
excluding the value attributable to the applicable company's regulatory capital
litigation: (i) Ahmanson had a ratio of market price to 1997 and 1998 IBES
estimated earnings as of September 19, 1997 of 17.1 and 14.7, respectively, as
compared with 19.0 and 16.0, respectively, for Coast and a median ratio of
market price to 1997 and 1998 IBES estimated earnings as of September 19, 1997
of 16.6 and 14.0 for the Selected California Large-Cap Thrifts, 17.2 and 14.4
for the Selected California Mid-Cap Thrifts and 16.0 and 14.0 for the Selected
Non-California Large Cap Thrifts; (ii) Ahmanson had a ratio of market price to
book value, as of September 19, 1997, of 2.8, as compared with 2.1 for Coast and
a median ratio of market price to book value for Selected California Large-Cap
Thrifts, Selected California Mid-Cap Thrifts and Selected Non-California
Large-Cap Thrifts, as of September 19, 1997, of 2.8, 1.7 and 2.1, respectively;
and (iii) Ahmanson had a ratio of market price to tangible book value, as of
September 19, 1997, of 3.3, as compared with 2.1 for Coast and a median ratio of
market price to tangible book value for Selected California Large-Cap Thrifts,
Selected California Mid-Cap Thrifts and Selected Non-California Large-Cap
Thrifts, as of September 19, 1997, of 2.9, 1.9 and 2.6, respectively.
 
     Goldman Sachs also noted for the Coast Board that, among other things, and
including the value attributable to the applicable company's regulatory capital
litigation: (i) Ahmanson had a ratio of market price to 1997 and 1998 IBES
estimated earnings as of September 19, 1997 of 15.6 and 13.3, respectively, as
compared with 14.2 and 11.9, respectively, for Coast and a median ratio of
market price to 1997 and 1998 IBES estimated earnings as of September 19, 1997
of 16.6 and 14.0 for the Selected California Large-Cap Thrifts, 16.5 and 12.7
for the Selected California Mid-Cap Thrifts and 14.7 and 13.0 for the Selected
Non-California Large Cap Thrifts; (ii) Ahmanson had a ratio of market price to
book value, as of September 19, 1997, of 2.5, as compared with 1.6 for Coast and
a median ratio of market price to book value for Selected California Large-Cap
Thrifts, Selected California Mid-Cap Thrifts and Selected Non-California
Large-Cap Thrifts, as of September 19, 1997, of 2.8, 1.7 and 2.1, respectively;
and (iii) Ahmanson had a ratio of market price to tangible book value, as of
September 19, 1997, of 3.0, as compared with 1.7 for Coast and a median ratio of
market price to tangible book value for Selected California Large-Cap Thrifts,
Selected California Mid-Cap Thrifts and Selected Non-California Large-Cap
Thrifts, as of September 19, 1997, of 2.9, 1.7 and 2.4, respectively.
 
     Discounted Cash Flow Analysis. Using a discounted cash flow analysis,
Goldman Sachs estimated the present value of the future dividend streams, share
repurchases and terminal values (without reference to the Litigation) that Coast
could produce over the four-year period from January 1, 1998 to December 31,
2001. The estimate of Coast's future net income assumed earnings growth for the
four-year period based on Coast management's earnings estimates and on IBES
earnings estimates. Using assumed discount rates of 11.0%, 12.0% and 13.0% and
terminal values based on multiples of price to forward earnings for the 12-month
period ending December 31, 2002 ranging from 11.0 times to 13.0 times, Goldman
Sachs calculated net present values ranging from $31 to $46 per share of Coast
Common Stock for the four-year period, excluding proceeds from the Litigation.
The analysis assumed no dividends, and ongoing repurchases in amounts consistent
with Coast's target capital ratios. This compares with the indicated values of
the Stock Consideration of $46.17 per share of Coast Common Stock included in
the Notional Value.
 
     Pro Forma Analysis. Goldman Sachs also performed a pro forma analysis of
certain other financial aspects of the Merger, calculating, among other things,
the pro forma ratios of common equity to assets and tangible common equity to
tangible assets and the efficiency ratio of the combined entity to be 5.0%, 3.8%
and 44.6%, respectively and calculating the pro forma return on average equity
and return on average assets, on a GAAP and on a cash basis, of the combined
entity to be 16.3% and 0.82%, and 17.8% and 0.90%, respectively. Goldman Sachs
also analyzed the pro forma impact on estimated earnings per share of the
combined entity on a reported GAAP and on a cash (excluding goodwill
amortization) basis. On a reported GAAP basis, Goldman Sachs calculated pro
forma earnings per share accretion of 2.0% and 6.1% (using IBES earnings
 
                                       35
<PAGE>   42
 
estimates for both Coast and Ahmanson) for 1998 and 1999, respectively, and 3.1%
and 8.2% (using earnings per share estimates provided by the management of both
Coast and Ahmanson) for 1998 and 1999, respectively. On a cash basis, Goldman
Sachs calculated pro forma earnings per share accretion of 4.2% and 8.7% (using
IBES earnings per share estimates for both Coast and Ahmanson) for 1998 and
1999, respectively, and 5.2% and 10.5% (using earnings estimates provided by the
management of both Coast and Ahmanson) for 1998 and 1999, respectively.
 
     The pro forma merger analysis assumed, among other things, that the pre-tax
expense savings realized from the merger would be $37.5 million in 1998 and
$75.0 million in 1999 and thereafter. Goldman Sachs assumed a pretax
restructuring reserve of $75.0 million and a transaction closing date of March
31, 1998. Goldman Sachs also calculated pro forma share repurchases for Ahmanson
to target a pro forma ratio of tangible common equity to tangible assets for
Ahmanson of 4.25%. Additionally, Goldman Sachs assumed that goodwill created in
the transaction would be amortized over a period of 25 years.
 
     Other Analyses. Goldman Sachs also reviewed, among other things, selected
investment research reports on, and earnings estimates for, Coast Common Stock
and Ahmanson Common Stock. Goldman Sachs prepared a summary of the historical
financial and market performance of Coast and Ahmanson, summarized Coast and
Ahmanson managements' respective estimates of financial performance in 1997,
based on publicly available information, and analyzed Coast's and Ahmanson's
deposit market share and branch presence in the regions in which they operate.
 
     The summary set forth above describes the material analyses that Goldman
Sachs performed and presented to the Coast Board on September 21, 1997 and
October 5, 1997, and does not purport to be a complete description of such
analyses. The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to partial analysis or a summary description.
 
     Goldman Sachs believes that its analyses must be considered as a whole and
that selecting portions of its analyses without considering all factors and
analyses would create an incomplete view of the analyses and processes
underlying its opinion. In its analyses, Goldman Sachs relied upon numerous
assumptions made by Coast and Ahmanson with respect to industry performance,
general business and economic conditions and other matters, many of which are
beyond the control of Coast or Ahmanson. Analyses based upon forecasts of future
results are not necessarily indicative of actual values, which may be
significantly more or less favorable than suggested by such analyses. No company
or transaction used as a comparison in the analyses is identical to Coast or
Ahmanson or to the Merger. Additionally, estimates of the value of businesses do
not purport to be appraisals or necessarily reflective of the prices at which
businesses actually may be sold. Because such estimates are inherently subject
to uncertainty, none of the Coast Board, Goldman Sachs, Ahmanson or any other
person assumes responsibility for the accuracy of such estimates. Goldman Sachs'
analyses were prepared solely for purposes of its opinions rendered October 5,
1997 and the date of this Proxy Statement/Prospectus provided to the Coast Board
regarding the fairness from a financial point of view of the Consideration
received by holders of Coast Common Stock pursuant to the Merger Agreement, and
do not purport to be appraisals or necessarily reflect the prices at which Coast
or its securities actually may be sold.
 
   
     For the services of Goldman Sachs as financial advisor to Coast in
connection with the Merger, pursuant to an engagement letter dated August 26,
1997, Coast has agreed to pay Goldman Sachs a transaction fee of 0.65% of the
aggregate consideration paid in connection with the Merger (not including
amounts payable in respect of the Litigation); provided, however, that such fee
may not be more than 0.65 multiplied by 110% of the "transaction value" at the
date of the Merger Agreement and may not be less than 0.65 multiplied by 90% of
the "transaction value" at the date of the Merger Agreement. Based on Ahmanson's
closing price of $58.625 on October 6, 1997, the transaction fee paid to Goldman
Sachs will range from $5.4 million to $6.6 million. If the fee were to be
calculated based on Ahmanson's closing price as of January 9, 1998, it would be
approximately $5.4 million. Coast has also agreed to pay Goldman Sachs its
reasonable out-of-pocket expenses, including the fees and disbursements of its
counsel, and to indemnify Goldman Sachs against certain liabilities, including
certain liabilities arising under the federal securities laws. Goldman Sachs has
provided certain investment banking and advisory services to Coast from time to
time, for which it has received, and will receive, customary compensation. In
addition, Goldman Sachs has provided, and may
    
 
                                       36
<PAGE>   43
 
provide in the future, certain investment banking services to Ahmanson, for
which it has received, and will receive, customary compensation.
 
     Goldman Sachs has advised Coast that, in the ordinary course of its
business as a full-service securities firm, Goldman Sachs may, subject to
certain restrictions, actively trade the equity and/or debt securities of Coast
or Ahmanson for its own account or for the accounts of its customers, and,
accordingly, may at any time hold a long or short position in such securities.
 
REASONS OF AHMANSON FOR THE MERGER
 
     Ahmanson believes that the Merger enhances Ahmanson's presence in key
markets throughout California, as well as Ahmanson's ability to offer financial
products to both individuals and small businesses. In addition, the Merger
provides an opportunity to enhance Ahmanson's stockholder value by increasing
earnings per share, reducing costs and enhancing revenue growth prospects.
 
EFFECTIVE TIME
 
     If the Transaction Proposal is approved by the requisite vote of the Coast
stockholders, all required governmental and other consents and approvals are
obtained and the other conditions to the obligations of the parties to
consummate the Merger are either satisfied or waived (if permitted), the CPR
Certificate Distribution will be effected on the Effective Date with a record
and payment date on the Effective Date immediately prior to the Effective Time
and the Merger will be consummated and will become effective on the Effective
Date and at the Effective Time (which will be the time that a certificate of
merger reflecting the Merger is filed with the Secretary of State of the State
of Delaware or at the time specified in such certificate). Unless otherwise
agreed by Coast and Ahmanson, and subject to the conditions to the obligations
of the parties to effect the Merger, the parties have agreed to cause the
Effective Date to occur on the fifth business day to occur after the last of the
conditions to the consummation of the Merger have been satisfied or waived (or,
at the election of Ahmanson, on the last business day of the month in which such
date occurs or, if such date occurs on one of the last five business days of
such month, on the last business day of the succeeding month). Ahmanson and
Coast each has the right, acting unilaterally, to terminate the Merger Agreement
should the Merger not be consummated by June 30, 1998. See "-- Termination;
Termination Fee."
 
DISTRIBUTION OF AHMANSON COMMON STOCK CERTIFICATES
 
     At or prior to the Effective Time, Ahmanson will deposit, or will cause to
be deposited, with a depository institution of recognized standing selected by
Ahmanson (in such capacity, the "Exchange Agent"), for the benefit of the
holders of certificates formerly representing shares of Coast Common Stock ("Old
Certificates") certificates representing the shares of Ahmanson Common Stock
("New Certificates") to which the holders of the Old Certificates are entitled
pursuant to the Merger Agreement, together with the estimated amount of cash to
be paid in exchange for fractional share interests.
 
     Promptly after the Effective Time, Ahmanson will send or cause to be sent
transmittal materials to each record holder of Coast Common Stock for use in
exchanging those certificates for the shares of Ahmanson Common Stock to which
such stockholder is entitled as a result of the Merger. COAST STOCKHOLDERS
SHOULD NOT SURRENDER THEIR CERTIFICATES FOR EXCHANGE UNTIL THEY RECEIVE THE
LETTER OF TRANSMITTAL AND INSTRUCTIONS. Ahmanson will cause the New Certificates
and/or any check in respect of any fractional share interests or dividends or
distributions which a holder of Coast Common Stock will be entitled to receive
to be delivered to such stockholder upon delivery to the Exchange Agent of
certificates representing such shares of Coast Common Stock owned by such
stockholder (or indemnity reasonably satisfactory to Ahmanson and the Exchange
Agent, if any of such certificates are lost, stolen or destroyed). None of the
Exchange Agent, Ahmanson, Coast or the CPR Trust will be liable to a holder of
Coast Common Stock for any amount properly delivered to a public official
pursuant to any applicable abandoned property, escheat or similar law.
 
     After the Effective Time, at the election of Ahmanson, no dividend or other
distribution with respect to Ahmanson Common Stock with a record date occurring
after the Effective Time will be paid to the holder of
 
                                       37
<PAGE>   44
 
any unsurrendered certificate for Coast Common Stock until the holder duly
surrenders such certificate. Upon such surrender, all undelivered dividends and
other distributions and, if applicable, a check for the amount to be paid in
lieu of any fractional share interest will be delivered to such stockholder, in
each case without interest.
 
     After the Effective Time, there will be no transfers of shares of Coast
Common Stock on Coast's stock transfer books. If certificates representing
shares of Coast Common Stock are presented for transfer after the Effective
Time, they will be canceled and exchanged for the shares of Ahmanson Common
Stock and a check for the amount due in lieu of fractional shares, if any,
deliverable in respect thereof.
 
   
DISTRIBUTION OF THE CPR CERTIFICATES
 
     Immediately prior to the Effective Time, Coast will deposit, or will cause
to be deposited, with the Exchange Agent the CPR Certificates for the benefit of
the holders of Coast Common Stock. The Exchange Agent will cause the CPR
Certificates to be delivered to the holders of Coast Common Stock together with
the New Certificates and/or checks in lieu of fractional share interests as
described above under "-- Distribution of Ahmanson Common Stock Certificates."
    
 
FRACTIONAL SHARES
 
     Pursuant to the terms of the Merger Agreement, each holder of shares of
Coast Common Stock exchanged pursuant to the Merger who would otherwise have
been entitled to receive a fraction of a share of Ahmanson Common Stock shall
receive, in lieu thereof, an amount in cash (without interest) determined by
multiplying such fraction by the average of the last sale prices of Ahmanson
Common Stock, as reported by the NYSE Composite Tape (as reported in The Wall
Street Journal or, if not reported therein, in another authoritative source),
for the five NYSE trading days immediately preceding the Effective Date. No such
holder will be entitled to dividends, voting rights, or any other rights as a
stockholder with respect to any fractional shares. No interest will be paid on
any such cash to be paid in lieu of fractional share interests or in respect of
dividends or distributions which any such person may be entitled to receive upon
delivery of Old Certificates to the Exchange Agent.
 
THE CPR TRUST, THE CPR CERTIFICATES AND THE CPR CERTIFICATE DISTRIBUTION
 
     In the Merger Agreement, Coast has agreed to take all actions necessary to
cause the CPR Trust to be formed. In addition, Coast has agreed to take all
actions necessary to cause the issuance of the CPR Certificates by the CPR Trust
to Coast and to effect the CPR Certificate Distribution with a record date and
payment date on the Effective Date immediately prior to the Effective Time.
However, Coast is not required to cause the CPR Trust to issue such CPR
Certificates or to effect the CPR Certificate Distribution until all conditions
to the Merger, other than such distribution, have been satisfied or waived. See
"-- Conditions to Consummation."
 
     Coast has also agreed to cause the CPR Trust to deliver to Coast
immediately prior to the Effective Time a number of CPR Certificates sufficient
for the delivery (or retention by Ahmanson as successor to Coast in certain
circumstances) of CPR Certificates required in connection with Coast Stock
Options, Coast Performance Share Awards, Coast SARs and appraisal rights that
are exercised. See "-- Stock Options; Performance Share Awards; SARs" and
"Appraisal Rights." Ahmanson has agreed to return to the CPR Trust any CPR
Certificates with respect to options that expire prior to exercise.
 
STOCK OPTIONS; PERFORMANCE SHARE AWARDS; SARS
 
     The Merger Agreement provides that each option to acquire shares of Coast
Common Stock (each, a "Coast Stock Option") which is outstanding at the
Effective Time, all of which are vested, will be converted into an option to
acquire, on the same terms and conditions as were applicable under Coast's 1996
Equity Incentive Plan or Coast's 1985 Stock Option and Stock Appreciation Rights
Plan (collectively, the "Coast Stock Plans"), as the case may be, (a) the number
of shares of Ahmanson Common Stock equal to (i) the number of shares of Coast
Common Stock subject to such Coast Stock Option, multiplied by (ii) the
 
                                       38
<PAGE>   45
 
Exchange Ratio (such product rounded down to the nearest whole number), at an
exercise price per share (rounded up to the nearest whole cent) equal to (A) the
aggregate exercise price for the shares of Coast Common Stock which were
purchasable pursuant to such Coast Stock Option divided by (B) the number of
full shares of Ahmanson Common Stock subject to the Replacement Option in
accordance with the foregoing and (b) one CPR Certificate for each share of
Coast Common Stock that would have been issuable upon exercise in full of such
Coast Stock Option.
 
     In addition, the Merger Agreement provides that each performance share
award (each, a "Coast Performance Share Award") which is outstanding at the
Effective Time under the Coast Performance Share Plan for Key Employees (the
"Coast Performance Share Award Plan") will be canceled and will only entitle the
holder thereof to receive for each share of Coast Common Stock with respect to
such award (a) one CPR Certificate and (b) an amount in cash equal to the
difference between (i) the result of multiplying the Exchange Ratio by the
average of the last sale prices of one share of Ahmanson Common Stock, as
reported by the NYSE Composite Tape (as reported in The Wall Street Journal or,
if not reported therein, in another authoritative source), for the five NYSE
trading days immediately prior to the Effective Date and (ii) the base price
under such award.
 
     The Merger Agreement further provides that each outstanding stock
appreciation right (each, a "Coast SAR") under the Coast Stock Plans shall be
canceled and only entitle the holder thereof to receive for each share of Coast
Common Stock with respect to such stock appreciation right (a) one CPR
Certificate and (b) an amount in cash equal to the difference between (i) the
result of multiplying the Exchange Ratio by the average of the last sale prices
of one share of Ahmanson Common Stock, as reported by the NYSE Composite Tape
(as reported in The Wall Street Journal or, if not reported therein, in another
authoritative source), for the five NYSE trading days immediately prior to the
Effective Date and (ii) the grant price of such Coast SAR.
 
     However, if Coast is unable to obtain from any holders of such Coast
Performance Share Awards or Coast SARs, as the case may be, the consents
necessary to effect such treatment, such holders will instead be entitled to (a)
with respect to each outstanding Coast Performance Share Award under the Coast
Performance Share Award Plan, an amount in cash equal to the result of
multiplying (i) the difference between the average of the last sale prices of
one share of Coast Common Stock, as reported by the NYSE Composite Tape (as
reported in The Wall Street Journal or, if not reported therein, in another
authoritative source), for the five NYSE trading days immediately prior to the
Effective Date and the base price under such award by (ii) the total number of
shares of Coast Common Stock with respect to such award and (b) with respect to
each outstanding Coast SAR under the Coast Stock Plans, an amount in cash equal
to the result of multiplying (i) the difference between the average of the last
sale prices of one share of Coast Common Stock, as reported by the NYSE
Composite Tape (as reported in The Wall Street Journal or, if not reported
therein, in another authoritative source), for the five NYSE trading days
immediately prior to the Effective Date and the grant price of such stock
appreciation right by (ii) the total number of shares of Coast Common Stock with
respect to such Coast SAR. All CPR Certificates with respect to the Coast
Performance Share Awards and Coast SARs as to which payments are made as
described in this paragraph will be retained by Ahmanson (as successor to
Coast). In addition, in the event that between the date of the Merger Agreement
and the Effective Date any Coast Performance Share Awards or Coast SARs are
exercised, Ahmanson (as successor to Coast) will be entitled to retain any CPR
Certificates that would otherwise have been issuable with respect to such Coast
Performance Share Awards or Coast SARs at the Effective Date.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The following summary of the material U.S. federal income tax consequences
of the Merger applies to a holder of Coast Common Stock that holds its shares as
capital assets. This summary may not apply to certain classes of taxpayers,
including foreign holders, insurance companies, tax-exempt organizations,
financial institutions, dealers in securities, traders in securities that elect
to mark to market, persons who acquired or acquire shares of Coast Common Stock
pursuant to the exercise of employee stock options or otherwise as compensation
and persons who hold shares of Coast Common Stock in a hedging transaction or as
part of a
 
                                       39
<PAGE>   46
 
straddle or conversion transaction. Each holder should consult its own tax
adviser as to the specific tax consequences of the Merger and the CPR
Certificate Distribution to such holder.
 
     This summary represents the opinions of Sullivan & Cromwell, special
counsel to Ahmanson, and Cleary, Gottlieb, Steen & Hamilton, special counsel to
Coast. The parties do not intend to request any ruling from the IRS as to the
U.S. federal income tax consequences of the Merger.
 
     The obligations of Ahmanson and Coast to consummate the Merger are subject
to the condition that they receive opinions (described further below) to the
effect that the Merger will be treated as a reorganization within the meaning of
Section 368(a) of the Code. In rendering such opinions, such counsel may require
and rely upon representations contained in letters from Coast, Ahmanson and
stockholders of Coast and assumptions set forth in the opinions. Assuming the
Merger is such a reorganization, the material federal income tax consequences of
the Merger to each of Ahmanson, Coast and a holder who exchanges shares of Coast
Common Stock for shares of Ahmanson Common Stock pursuant to the Merger will be
as follows:
 
          (a) No gain or loss will be recognized by Ahmanson or Coast as a
     result of the consummation of the Merger.
 
          (b) No gain or loss will be recognized by a holder except as follows:
     Gain or loss may be recognized by a holder who receives cash in lieu of a
     fractional share interest in Ahmanson Common Stock (see (e) below). In
     addition, gain (but not loss) may be recognized in an amount not exceeding
     the fair market value of such holder's CPR Certificates at the Effective
     Time (which will include a proportionate share of the value attributable to
     Ahmanson's having entered into the Commitment) (see (f) below).
 
          (c) The aggregate adjusted tax basis of shares of Ahmanson Common
     Stock (including any fractional share interest in Ahmanson Common Stock, as
     described below) received by a holder will be the same as the aggregate
     adjusted tax basis of the shares of Coast Common Stock exchanged therefor,
     decreased by the value of the CPR Certificates received by such holder (as
     such value is determined in (f)(i) below) and increased by the amount of
     gain recognized upon the receipt of CPR Certificates (as described in (f)
     below).
 
          (d) The holding period of shares of Ahmanson Common Stock (including a
     fractional share interest in Ahmanson Common Stock deemed received and
     redeemed, as described below) received by a holder will include the holding
     period of the Coast Common Stock exchanged therefor.
 
          (e) A holder who receives cash in lieu of a fractional share interest
     in Ahmanson Common Stock will be treated as having received the fractional
     share interest and as having received the cash in redemption of that
     fractional share interest. Under Section 302 of the Code, if the deemed
     redemption is "substantially disproportionate" with respect to the holder
     or is "not essentially equivalent to a dividend" after giving effect to the
     constructive ownership rules of the Code, the holder will generally
     recognize capital gain or loss equal to the difference between the amount
     of cash received and the holder's adjusted tax basis in the fractional
     share interest (determined under clause (c) above). Such capital gain or
     loss will be long-term capital gain or loss if the holder's holding period
     in the fractional share interest (determined under clause (d) above) is
     more than one year (and will be taxed at the rates set forth in the final
     sentence of (f) below).
 
          (f) A holder will recognize gain to the extent of the lesser of:
 
             (i) the fair market value of the holder's CPR Certificates at the
        Effective Time (which, at the Effective Time, will include the
        proportionate share of the value attributable to Ahmanson's having
        entered into the Commitment); and
 
   
             (ii) the excess of (A) the sum of (i) the fair market value of the
        shares of Ahmanson Common Stock (including any fractional share interest
        in Ahmanson Common Stock for which cash is received) received by the
        holder and (ii) the amount determined in (i) above; over (B) the
        holder's adjusted federal income tax basis for the shares of Coast
        Common Stock exchanged in the Merger.
    
 
                                       40
<PAGE>   47
 
             If the shares of Coast Common Stock exchanged in the Merger were
        held as capital assets at the Effective Time, any such gain will be
        treated as capital gain (which will be long-term capital gain if the
        shares of Coast Common Stock were held for more than one year) provided
        the holder of Coast Common Stock does not own, either directly or
        applying certain ownership attribution rules, contemporaneously with the
        Merger any Ahmanson stock other than the Ahmanson Common Stock received
        by the holder in the Merger. A holder that owns such additional Ahmanson
        stock generally will be entitled to treat such gain as capital gain only
        if a distribution of CPR Certificates in a hypothetical redemption by
        Ahmanson immediately following the Effective Time of an equivalent
        amount of Ahmanson Common Stock would have qualified for capital gain
        treatment under the standards of Section 302 of the Code. Holders owning
        additional shares of Ahmanson stock should consult their own tax
        advisors concerning the treatment of gain as capital gain or ordinary
        income. Long-term capital gain of a non-corporate holder is generally
        subject to a maximum tax rate of 28% in respect of property held for
        more than one year and to a maximum tax rate of 20% in respect of
        property held for more than 18 months.
 
          (g) The adjusted tax basis of CPR Certificates received by a holder
     will equal the value of the CPR Certificates described in (f)(i) above, and
     the holding period of the CPR Certificates will begin on the Effective Date
     (and will not include the holding period of the holder's Coast Common
     Stock).
 
     Ahmanson's obligation to consummate the Merger is conditioned upon, among
other things, the receipt of an opinion of Sullivan & Cromwell, dated the
Effective Date, to the effect that the Merger is a reorganization under Section
368(a) of the Code and that no gain or income will be recognized by Ahmanson in
the Merger. Coast's obligation to consummate the Merger is conditioned upon,
among other things, the receipt of an opinion of Cleary, Gottlieb, Steen &
Hamilton, dated the Effective Date, to the effect that the Merger is a
reorganization within the meaning of Section 368(a) of the Code and that,
accordingly, (i) no gain or loss will be recognized by Coast as a result of the
Merger and (ii) no gain or loss will be recognized by a stockholder of Coast who
receives shares of Ahmanson Common Stock in exchange for shares of Coast Common
Stock, except (A) with respect to cash received in lieu of fractional share
interests and (B) for gain that may be recognized in an amount not exceeding the
fair market value at the time of the Merger of such stockholder's CPR
Certificates (which represent such stockholder's share of the Commitment
Amount). The opinion of Cleary, Gottlieb, Steen & Hamilton will not apply to
stockholders or persons receiving Ahmanson Common Stock or CPR Certificates as
compensation.
 
   
     Under the terms of the Merger Agreement, the conditions to the Merger,
including receipt by each party of opinions of counsel relating to tax matters,
may generally be waived by Ahmanson or Coast, as applicable. In the event of a
failure to obtain a tax opinion substantially to the extent set forth above, or
in the event Coast determined to waive such condition to the consummation of the
Merger, Coast would resolicit the votes of its stockholders to approve
consummation of the Merger. See "-- Conditions to Consummation" and
"-- Amendment and Waiver."
    
 
     BECAUSE CERTAIN TAX CONSEQUENCES OF THE MERGER MAY VARY DEPENDING UPON THE
PARTICULAR CIRCUMSTANCES OF EACH HOLDER OF COAST COMMON STOCK AND OTHER FACTORS,
EACH SUCH HOLDER IS URGED TO CONSULT SUCH HOLDER'S OWN TAX ADVISER AS TO THE
SPECIFIC TAX CONSEQUENCES OF THE MERGER TO SUCH HOLDER (INCLUDING THE
APPLICATION AND EFFECT OF STATE AND LOCAL INCOME AND OTHER TAX LAWS).
 
   
MANAGEMENT AND OPERATIONS AFTER THE MERGER
    
 
     Ahmanson will be the surviving corporation resulting from the Merger and
will continue to be governed by the laws of the State of Delaware and will
operate in accordance with its certificate of incorporation and bylaws as in
effect immediately prior to the Effective Time until otherwise amended or
repealed after the Effective Time. Under the Merger Agreement, Ahmanson has
agreed to cause Mr. Martin, Chairman of the Board and Chief Executive Officer of
Coast, to be elected or appointed as director of Ahmanson at, or as promptly as
practicable after, the Effective Time. The directors and officers of Ahmanson in
office
 
                                       41
<PAGE>   48
 
immediately prior to the Effective Time, together with such additional director
and such additional persons as may thereafter be elected, will serve as the
directors and officers of Ahmanson from and after the Effective Time in
accordance with Ahmanson's certificate of incorporation and bylaws.
 
   
     Ahmanson's Quarterly Report on Form 10-Q for the quarter ended September
30, 1997 contains information concerning issues pertaining to the year 2000 and
Ahmanson's systems, and stockholders of Coast are directed to that report for a
more complete description of such issues. Following consummation of the Merger,
Coast's systems will be replaced with those of Ahmanson. While Ahmanson does not
expect any year 2000 problems to result from integrating Coast into Ahmanson,
there can be no assurance that there will be no such problems.
    
 
POST-ACQUISITION COMPENSATION AND BENEFITS
 
     The Merger Agreement provides generally that Ahmanson will, from and after
the Effective Time, (a) honor in accordance with their terms all employment or
severance agreements entered into prior to the date of the Merger Agreement that
were previously disclosed, (b) provide former employees of Coast who remain as
employees of Ahmanson with employee benefit plans no less favorable in the
aggregate than those provided to similarly situated employees of Ahmanson, (c)
provide employees of Coast who remain as employees of Ahmanson credit for years
of service with Coast or any of its subsidiaries prior to the Effective Time for
the purpose of eligibility and vesting and (d) cause any and all pre-existing
condition limitations (to the extent such limitations did not apply to a
pre-existing condition under comparable compensation and benefit plans of Coast)
and eligibility waiting periods under group health plans of Ahmanson to be
waived with respect to former employees of Coast who remain as employees of
Ahmanson (and their eligible dependents) and who become participants in such
group health plans. The Merger Agreement provides, however, that nothing therein
will limit or restrict the right of Ahmanson to (i) terminate the employment of
any employee at any time for any reason whatsoever, with or without cause, and
(ii) modify, amend or terminate any employee benefit or other plans of Ahmanson.
In the Merger Agreement, Ahmanson agreed to pay up to $2,000,000 as retention
bonuses, payable upon dates following consummation of the Merger specified in
the Merger Agreement, to be allocated primarily among non-executive employees of
Coast.
 
   
     On October 27, 1997, Ahmanson and Coast announced the adoption of the Coast
Federal Bank, Federal Savings Bank Change in Control Severance Pay Plan (the
"Severance Plan") effective from November 1, 1997 with respect to certain
employees of Coast. Ahmanson and Coast have agreed that the adoption of the
Severance Plan is deemed to satisfy and constitutes full performance by Ahmanson
of its obligations described in the last sentence of the immediately preceding
paragraph. The Severance Plan generally provides that employees of Coast Federal
whose employment is terminated without cause as a consequence of the Merger or
the consolidation of branches prior to December 31, 1998 will receive severance
compensation. The severance compensation to be received by an eligible employee
(other than a vice president) will range from four weeks' worth of compensation
to 36 weeks' worth, depending upon such employee's length of service with Coast
Federal. An eligible employee (other than a vice president) who has worked less
than one full year with Coast Federal will receive four weeks' worth of
severance compensation and an eligible employee (other than a vice president)
who has 21 years of service or more with Coast Federal will receive 36 weeks'
worth of severance compensation, with eligible employees with years of service
between one and 21 receiving a number of weeks' worth of compensation based upon
a schedule included in the Severance Plan (e.g., six years of service/ 12 weeks,
12 years of service/24 weeks and 18 years of service/36 weeks). Severance
compensation for eligible employees who are vice presidents will also be based
upon a range of service from less than one year to 21 years or more, with the
actual severance compensation ranging from 13 weeks' worth to 52 weeks' worth of
compensation.
    
 
INTERESTS OF CERTAIN PERSONS IN THE TRANSACTION PROPOSAL
 
     Certain members of Coast's management and the Coast Board may be deemed to
have certain interests in the Merger and the transactions contemplated thereby
in addition to their interests as Coast stockholders. The Coast Board was aware
of these interests in approving the Merger Agreement.
 
                                       42
<PAGE>   49
 
  Ahmanson Board of Directors.
 
     As described above, the Merger Agreement provides that Ahmanson agrees to
cause Mr. Martin, Chairman of the Board and Chief Executive Officer of Coast, to
be elected or appointed as a director of Ahmanson at, or as promptly as
practicable after, the Effective Time.
 
  Incentive Plans.
 
     The Merger Agreement provides that all options to acquire Coast Common
Stock outstanding at the Effective Time under the Coast Stock Plans, including
those held by management and members of the Coast Board, will be assumed by
Ahmanson. Each stock option will thereafter constitute an option to acquire
shares of Ahmanson Common Stock and CPR Certificates as set forth above under
"-- Stock Options; Performance Share Awards; SARs." In addition, the Merger
Agreement provides that each outstanding Coast Performance Share Award under the
Coast Performance Share Award Plan and each outstanding Coast SAR, including
those held by management, will be canceled (subject to the consent of the holder
of such Coast Performance Share Award or Coast SAR, as the case may be) and
entitle the holder thereof to a CPR Certificate and an amount in cash generally
based on an average of the Ahmanson Common Stock over a five day period over the
base price or grant price, as applicable. See "-- Stock Options; Performance
Share Awards; SARs."
 
  Indemnification and Insurance.
 
     The Merger Agreement provides that following the Effective Date, Ahmanson
will indemnify, defend and hold harmless the present directors and officers of
Coast and its subsidiaries against all costs or expenses (including reasonable
attorneys' fees), judgments, fines, losses, claims, damages or liabilities as
incurred, in connection with any claim, action, suit, proceeding or
investigation, whether civil, criminal, administrative or investigative, arising
out of actions or omissions occurring at or prior to the Effective Time to the
fullest extent that Coast is permitted to indemnify (and advance expenses to)
its directors and officers under the laws of the State of Delaware, the
certificate of incorporation of Coast (the "Coast Charter") and the by-laws of
Coast (the "Coast By-Laws") as in effect on October 5, 1997. The Merger
Agreement also provides that Ahmanson will use its reasonable best efforts for
four years after the Effective Time to provide directors' and officers'
liability insurance that serves to reimburse the present and former officers and
directors of Coast or any of its subsidiaries with respect to claims against
such directors and officers arising from facts or events which occurred at or
prior to the Effective Time, which insurance will contain at least the same
coverage and amounts, and will contain terms and conditions no less
advantageous, as the coverage currently provided by Coast; provided, however,
that in no event will Ahmanson be required to expend more than 200% of the
current amount expended by Coast to maintain such insurance and that if Ahmanson
is unable to maintain or obtain such insurance, Ahmanson will use its reasonable
best efforts to obtain as much comparable insurance as is available for such
200% amount.
 
  Coast Executive Agreements and Plans.
 
     Change of Control. The Merger will constitute a "change of control" within
the meaning of the agreements and plans described below.
 
     Employment Agreements. Coast Federal currently has employment agreements
with its Chief Executive Officer, President and Senior Executive Vice
Presidents, as well as certain other officers of Coast Federal and its
subsidiaries. Mr. Ray Martin's agreement provides for a three year term renewed
annually by the Coast Board. The agreements with Messrs. Robert Hunt, James
Boyle, Norman Raiden and James Barritt provide for two year terms renewed
annually by the Coast Board. However, in the event of a change in control of
Coast Federal, the term of such executives' agreements automatically converts to
three years renewable annually by the Board of Directors. In addition, in the
event of a change in control, for the remainder of the term of the agreement,
Coast Federal will pay each executive a base monthly compensation equal to his
monthly salary then in effect plus 1/12 of the aggregate amount of the higher of
the discretionary bonuses attributable to the last two bonus computation years
that ended before the change in control.
 
                                       43
<PAGE>   50
 
   
     In the event that Coast Federal elects to terminate any of the executives'
employment without cause (as defined therein), or if the executive elects to
terminate his employment (i) within one year of a change of control of Coast
Federal for any reason (with respect to Mr. Martin only), (ii) due to Coast
Federal's failure to comply with certain conditions of service (including
certain additional conditions following a change in control of Coast Federal) or
(iii) within the 30-day period immediately following the one year anniversary of
a change in control of Coast Federal, the affected executive will be entitled to
receive a lump sum payment within 30 days of such termination equal to the
discounted present value of the compensation due under the agreement for the
balance of its term. In addition, the executives will be entitled to receive
medical insurance benefits for the remaining term of the agreement. In the event
of a change in control, each executive will also receive a gross-up payment if
the payments and benefits under the agreement and all other contracts or
arrangements, in the aggregate, exceed the maximum amount that may be paid to
the executive without triggering golden parachute penalties under Section 280G
of the Code and related provisions. Such gross-up payment will be an amount
which, after payment by the executive of all income and excise taxes on the
gross-up payment, equals the excise taxes the executive must pay under Section
4999 of the Code with respect to the payments and benefits for which the
executive is receiving the gross-up payment. Assuming termination of the
employment of Coast's executive officers, pursuant to the employment agreements
described above, the severance payments required to be made to Messrs. Martin,
Hunt, Boyle, Barritt and Raiden would be approximately $2,735,000, $1,933,000,
$1,481,000, $1,335,000 and $1,377,000, respectively, as a result of the Merger
being deemed a change in control under such employment agreements.
    
 
   
     Severance Agreements. Coast Federal currently has severance agreements with
its Senior Vice Presidents (including executive officers Messrs. Gerald Rich and
Mark Neal). The terms of such agreements commence on the date of a change in
control of Coast Federal and terminate one year from the date of such change in
control. Such agreements may be terminated earlier upon 30 days notice by either
party to the agreement, provided that if such agreement is terminated by Coast
Federal after a change in control, Coast Federal will remain obligated to make
payments under such agreement. If there has been a change in control while the
executive is still employed by Coast Federal and during the term of the
agreement the executive's employment with Coast Federal is subsequently
terminated, the executive will be entitled to a severance payment, unless such
termination of employment was (i) as a result of the executive's death,
disability (as defined therein) or retirement (as defined therein), or (ii) by
Coast Federal for cause (as defined therein) or (iii) by the executive other
than for good reason (as defined therein). Such severance payment would be a
lump sum amount equal to one year's salary (at the higher of the executive's
salary at the time of the change in control or of the termination of the
executive's employment), payable 50% within 5 days of the executive's
termination of employment and the remainder within 60 days of such termination.
Assuming termination of the employment of Messrs. Rich and Neal, two of Coast's
executive officers, pursuant to the severance agreements described above, the
severance payments required to be made to such executive officers would
aggregate approximately $265,000, as a result of the Merger being deemed a
change in control under such severance agreements.
    
 
     Supplemental Executive Retirement Plan of Coast Federal. Coast Federal
currently has a non-qualified supplemental executive retirement plan (the
"Supplemental Plan") to provide supplemental retirement benefits to its Chief
Executive Officer, President, Senior Executive Vice Presidents, Senior Vice
Presidents and certain other senior officers of Coast Federal and its
subsidiaries. Monthly benefits are based upon a percent of such participant's
average monthly earnings during the three highest paid consecutive years in the
ten years preceding retirement. Monthly benefits payable under the Supplemental
Plan are reduced (but not below a specified percentage of such average monthly
earnings) by the sum of the benefit payable to the executive under Coast
Federal's qualified pension plan, Social Security and certain other payments. In
general, benefits payable under the Supplemental Plan are reduced if a
participant retires prior to attaining age 65. Participants are generally
eligible to receive benefits under the Supplemental Plan after the completion of
10 years of service with Coast Federal and attainment of age 60, after
completion of 25 years of service with Coast Federal and attainment of age 55,
or, regardless of the number of years of service, after attaining age 65.
Certain payments may also be made in the case of death or disability (as defined
therein) of the participant. If a participant's employment terminates prior to
eligibility for his or her benefit other than by reason of death or disability
or in the context of a change in control as set forth in the next sentence, such
participant forfeits his
 
                                       44
<PAGE>   51
   
or her benefit under the Supplemental Plan, with the exception of Messrs.
Martin, Hunt, Boyle, Raiden and Barritt to whom such benefit would be paid upon
attainment of age 65 in such case. If a participant is terminated by Coast
Federal without cause (as defined therein) or voluntarily resigns from Coast
Federal for good reason (as defined therein) before the third anniversary of a
change in control of Coast Federal, Coast Federal will be obligated to commence
paying in the next calendar month following such termination of employment such
participant's benefit in an annuity or lump sum as chosen by the participant
(subject to certain reductions). The benefit payable to participants in the case
of a change in control may be reduced in order to avoid the triggering of golden
parachute penalties under Section 280G of the Code, with the exception of
Messrs. Martin, Hunt, Boyle, Raiden and Barritt. Assuming termination of the
employment of Coast's executive officers, lump sum payments made under the
Supplemental Plan to Messrs. Martin, Hunt, Boyle, Barritt and Raiden would be
approximately $5,746,000, $1,728,000, $1,547,000, $680,000 and $2,325,000,
respectively, and lump sum payments to Coast's two other executive officers,
Messrs. Rich and Neal, would aggregate approximately $574,000, as a result of
the Merger being deemed a change in control under the Supplemental Plan.
    

   
     Deferred Compensation Plan. Coast Federal currently has an unfunded
deferred compensation plan (the "Deferred Compensation Plan") to allow certain
designated officers and directors of Coast Federal to defer for receipt in a
later year a portion of his or her annual compensation. Each participant who
elects to defer compensation must also elect a time and manner for its receipt
in a later year in accordance with the terms of the Deferred Compensation Plan
and generally will not be permitted to receive such deferred compensation prior
to the elected time. Any such deferred compensation will be credited to an
account on behalf of a participant and will be credited with earnings based upon
an interest rate determined by Coast Federal or, if permitted, deemed
investments chosen by the participant. In the event a participant's employment
with Coast Federal is terminated by Coast Federal following a change in control
of Coast Federal or the participant voluntarily terminates employment due to a
material reduction in responsibilities or compensation benefits following a
change in control of Coast Federal, Coast Federal must pay the participant a
lump sum distribution of such participant's account in January of the year
following the year of termination, unless the participant has requested
otherwise in writing at least one year prior to such change in control. Assuming
termination of the employment of Coast's executive officers, lump sum
distributions of their accounts would be made to the executive officers, in
January, 1999, as a result of the Merger being deemed a change in control under
the Deferred Compensation Plan. However, if the participant has elected to
invest amounts deferred under the Deferred Compensation Plan in an illiquid
investment (such as an annuity), such amounts will be paid out in accordance
with the terms of such investment and shall not be subject to the change of
control provisions.
    
 
  Coast Executives and the CPR Trust.
 
   
     Four senior Coast executives (Messrs. Martin, Hunt, Raiden and Barritt)
with knowledge of the facts underlying the Litigation will be the Litigation
Trustees of the CPR Trust. Mr. Martin (currently Chairman of the Board and Chief
Executive Officer of Coast and Coast Federal), Mr. Hunt (currently President and
Chief Operating Officer of Coast and Coast Federal) and Mr. Barritt (currently
Senior Executive Vice President and Chief Financial Officer of Coast and Coast
Federal) were officers of Coast and Coast Federal both at the time that Coast
Federal entered into the agreement with the federal government to treat certain
amounts as a permanent addition to Coast Federal's regulatory capital in
connection with Coast Federal's acquisition of Central Savings and Loan
Association, and also at the time of the alleged breach of that agreement by the
federal government that gave rise to the claims underlying the Litigation. Mr.
Martin, Mr. Hunt and Mr. Barritt, together with Mr. Raiden (currently Senior
Executive Vice President of Coast and Coast Federal and General Counsel of
Coast, and who joined Coast soon after the alleged breach of the agreement by
the federal government and served as General Counsel of Coast Federal until
December 3, 1997), have been involved in the prosecution of the Litigation to
date. The CPR Trust Agreement will provide that, as Litigation Trustees, they
will have sole and exclusive right to instruct Coast Federal (and its
successors) with respect to the prosecution of the Litigation and Ahmanson shall
cause Coast Federal (and its successors) to follow these instructions other than
instructions that are not reasonable. Litigation Trustees will not be permitted
to hold any other full-time employment during the term of their tenure as
Litigation Trustees prior
    
 
                                       45
<PAGE>   52
 
   
to the receipt of the Litigation Proceeds by the Ahmanson Group. Each of the
initial Litigation Trustees will, as a condition of his continuation as a
Litigation Trustee, be obligated to retain at least 50% of the CPR Certificates
received in the CPR Certificate Distribution and the Merger and upon exercise of
Replacement Options, until the Litigation Proceeds are received by the Ahmanson
Group. Transfers by a Litigation Trustee to his family members or to any trust
created for the benefit of his family will be included in such 50% calculation
for so long as such transferees retain the CPR Certificates.
    
 
   
     The Amended and Restated Declaration of Trust to be entered into by Coast,
the Litigation Trustees and the institutional trustee and Delaware trustee for
the CPR Trust (the "CPR Trust Agreement") will provide that, as compensation,
the CPR Trust will pay each Litigation Trustee, during the term of his service
as a Litigation Trustee, fees of $400,000 per year for five years (except that
if the Litigation is sooner terminated, the remainder of such fees (but in no
event with respect to a period longer than two years after the year in which
such termination occurs) will be accelerated upon final resolution of the
Litigation and receipt by the Ahmanson Group of the Litigation Proceeds), plus
reimbursement of all reasonable out-of-pocket expenses. If the services of the
Litigation Trustees continue to be necessary after the initial five-year period
or such receipt of Litigation Proceeds, the Litigation Trustees will be entitled
to a fee of $200 per hour until termination of the CPR Trust.
    
 
   
     The CPR Trust Agreement will provide that the Litigation Trustees will have
no liability to Ahmanson, Coast or CPR Certificate holders unless it is
established in a final judicial determination by clear and convincing evidence
that any decision or action was undertaken with deliberate intent to injure the
CPR Certificate holders or with reckless disregard for the best interests of
such holders, and, in any event, any liability will be limited to actual,
proximate, quantifiable damages. The CPR Trust Agreement will provide that the
CPR Trust will be obligated to indemnify and advance expenses to, without
requirement of bond or other security, each Litigation Trustee against any and
all losses, claims, costs, expenses and liabilities arising out of or relating
to, among other things, the Litigation and actions taken by the Litigation
Trustees except that if CPR Certificate holders meet the burden of establishing
in a final judicial determination by clear and convincing evidence that such
losses, claims, costs, expenses or liabilities arose as the result of actions or
decisions undertaken with deliberate intent to injure the CPR Certificate
holders or with reckless disregard for the best interests of such holders by
such Litigation Trustees, no indemnification shall apply. The CPR Trust
Agreement will provide that the CPR Trust will be obligated to obtain liability
insurance to cover its indemnification obligations to the Litigation Trustees
and others and any other liabilities of the Litigation Trustees.
    
 
CONDITIONS TO CONSUMMATION
 
     The obligations of Coast and Ahmanson to consummate the Merger are subject
to the satisfaction or written waiver of the following conditions: (a) the
Transaction Proposal shall have been duly adopted by the requisite vote of the
stockholders of Coast; (b) all regulatory approvals required to consummate the
transactions contemplated by the Merger Agreement shall have been obtained and
shall remain in full force and effect and all statutory waiting periods in
respect thereof shall have expired and no such approvals shall contain any
conditions, restrictions or requirements which would reasonably be expected to
(i) following the Effective Time, have a Material Adverse Effect (as defined in
the Merger Agreement) on Ahmanson and its subsidiaries taken as a whole or (ii)
reduce the benefits of the Merger to such a degree that Ahmanson would not have
entered into the Merger Agreement had such conditions, restrictions or
requirements been known at the date of the Merger Agreement; (c) no
administrative agency or commission or other federal, state or local
governmental authority or instrumentality shall have taken any action
prohibiting the consummation of the transactions contemplated by the Merger
Agreement; (d) the Registration Statements shall have become effective and shall
not be subject to a stop order and, if required, the CPR Trust Agreement shall
have been duly qualified under the Trust Indenture Act of 1939, as amended, and
the rules and regulations thereunder; (e) the shares of Ahmanson Common Stock to
be issued in the Merger shall have been approved for listing on the NYSE,
subject to official notice of issuance; (f) Coast shall have received an opinion
of Cleary, Gottlieb, Steen & Hamilton, special counsel to Coast, as to certain
tax matters; (g) Ahmanson shall have received an opinion of Sullivan & Cromwell,
special counsel to Ahmanson, as to certain tax matters; (h) the other party's
 
                                       46
<PAGE>   53
 
representations and warranties shall remain accurate and each party shall have
performed in all material respects all of the obligations required to be
performed by it pursuant to the Merger Agreement, and shall have delivered
certificates confirming satisfaction of the foregoing requirements; (i) each
party shall have received a letter of the other party's independent accountants
as to certain financial information of the other party; (j) in the case of
Coast, Ahmanson shall have executed and delivered the Commitment and made the
transfer to the CPR Trust with respect to the Expense Fund (as defined herein);
(k) in the case of Ahmanson, holders of no more than 5% of the outstanding
shares of Coast Common Stock shall have given notice that their shares of Coast
Common Stock be treated as Dissenters' Shares; and (l) in the case of Ahmanson,
Coast shall have established the CPR Trust and shall have caused the CPR Trust
to issue the CPR Certificates to Coast and shall have distributed the CPR
Certificates to the stockholders of Coast as required by the Merger Agreement.
 
     The conditions to consummation of the Merger may generally be waived, in
whole or in part, to the extent permissible under applicable law, by the party
for whose benefit the condition has been imposed, without the approval of the
Coast stockholders. See "-- Amendment and Waiver."
 
     No assurances can be provided as to when or if all of the conditions
precedent to the Merger can or will be satisfied or waived by the appropriate
party. As of the date of this Proxy Statement/Prospectus, Ahmanson and Coast
have no reason to believe that any of the conditions set forth above will not be
satisfied.
 
REGULATORY APPROVALS
 
   
     The Merger is subject to the approval of the OTS, under the Home Owners'
Loan Act and related OTS regulations. Ahmanson filed an application for such
approval on November 3, 1997. Approval requires consideration by the OTS of
various factors, including assessments of the competitive effect of the
contemplated transaction, the managerial and financial resources and future
prospects of the resulting institution and the effect of the contemplated
transaction on the convenience and needs of the communities to be served. These
regulatory considerations also include, among other things, an assessment of
compliance with the Community Reinvestment Act of 1977 (the "CRA"). Each of Home
Savings and Coast Federal currently has an "outstanding" CRA rating. The
regulations of the OTS require publication of notice of, and an opportunity for
public comment with respect to, the application filed in connection with the
Merger. The public comment period has expired.
    
 
   
     The Merger Agreement provides that the obligation of each of Ahmanson and
Coast to consummate the Merger is conditioned upon, among other things, (i) the
receipt of all requisite regulatory approvals, including the approval of the
OTS, (ii) the termination or expiration of all statutory waiting periods in
respect thereof and (iii) no such approvals containing conditions, restrictions
or requirements which would reasonably be expected to, after the Effective Time,
have a Material Adverse Effect on Ahmanson and its subsidiaries taken as a whole
or reduce the benefits of the transactions contemplated in the Merger Agreement
to such a degree that Ahmanson would not have entered into the Merger Agreement
had such been known at the date of the Merger Agreement.
    
 
     THE MERGER CANNOT PROCEED IN THE ABSENCE OF THE REQUISITE REGULATORY
APPROVALS. THERE CAN BE NO ASSURANCES THAT ALL SUCH REGULATORY APPROVALS WILL BE
OBTAINED OR AS TO THE DATES OF SUCH APPROVALS. THERE CAN ALSO BE NO ASSURANCE
THAT SUCH APPROVALS WILL NOT CONTAIN A CONDITION, RESTRICTION OR REQUIREMENT
THAT CAUSES SUCH APPROVALS TO FAIL TO SATISFY THE CONDITIONS SET FORTH IN THE
MERGER AGREEMENT. SEE "-- THE EFFECTIVE TIME," "-- CONDITIONS TO CONSUMMATION"
AND "-- AMENDMENT AND WAIVER."
 
AMENDMENT AND WAIVER
 
     To the extent permitted by law, Coast and Ahmanson may amend the Merger
Agreement by written agreement at any time prior to the Effective Time. Prior to
the Effective Time, either Coast or Ahmanson may waive any default in the
performance of any term of the Merger Agreement by the other party, may waive or
extend the time for the fulfillment by the other party of any of its obligations
under the Merger Agreement,
 
                                       47
<PAGE>   54
 
and may waive any of the conditions precedent to the obligations of such party
under the Merger Agreement, except any condition that, if not satisfied, would
result in the violation of an applicable law or governmental regulation.
 
TERMINATION; TERMINATION FEE
 
     The Merger Agreement may be terminated, and the Merger abandoned, at any
time prior to the Effective Time by mutual consent of the boards of directors of
Coast and Ahmanson. In addition, the Merger Agreement may be terminated, and the
Merger abandoned, prior to the Effective Time by (a) either Ahmanson or Coast
if: (i) the other party breaches, and does not timely cure any breach of, a
representation, warranty, covenant or other agreement contained in the Merger
Agreement and such breach, individually or in the aggregate, would be reasonably
likely to have a Material Adverse Effect (as defined in the Merger Agreement) on
the non-breaching party; (ii) any consent or approval of certain regulatory
authorities is denied by final nonappealable action of such authority or the
Coast stockholders fail to approve the Transaction Proposal; or (iii) the Merger
has not been consummated by June 30, 1998; or (b) by Ahmanson, if the Coast
Board has failed to recommend approval of the Merger, has withdrawn such
recommendation or has modified or changed such recommendation in a manner
adverse to Ahmanson.
 
     Coast would be required to pay Ahmanson a Termination Fee of $35 million if
(a) the Merger Agreement is terminated (i) by Ahmanson due to a breach by Coast
of any representation, warranty or covenant contained in the Merger Agreement,
to a failure by the Coast Board to recommend approval of the Merger to Coast
stockholders, or to a withdrawal, modification, or change of such recommendation
in a manner adverse in any respect to the interests of Ahmanson, or (ii) by
Coast because the Coast stockholders vote to reject the Merger, if in either
case an acquisition proposal by a third party with respect to Coast or any of
its subsidiaries exists at the time the event giving rise to such termination
right occurs; and (b) a definitive agreement with respect to an acquisition
proposal by a third party is entered into by Coast or any of its subsidiaries
within 12 months of such termination.
 
CONDUCT OF BUSINESS PENDING THE MERGER
 
  Coast.
 
     Coast has agreed in the Merger Agreement, unless the prior written consent
of Ahmanson is obtained and except as otherwise previously disclosed, not to,
and to cause each of its subsidiaries not to:
 
          (a) conduct the business of Coast and its subsidiaries other than in
     the ordinary and usual course or fail to use reasonable efforts to preserve
     intact their business organizations and assets and maintain their rights,
     franchises and existing relations with customers, suppliers, employees and
     business associates, or take any action reasonably likely to have an
     adverse effect upon Coast's ability to perform any of its material
     obligations under the Merger Agreement;
 
          (b) other than pursuant to securities or obligations convertible into
     or exercisable or exchangeable for, or giving any person any right to
     subscribe for or acquire, or any options, calls or commitments relating to,
     or any stock appreciation right or other instrument the value of which is
     determined in whole or in part by reference to the market price or value
     of, shares of capital stock of such person (each, a "Right") previously
     disclosed and outstanding on the date of the Merger Agreement, (i) issue,
     sell or otherwise permit to become outstanding, or authorize the creation
     of, any additional shares of Coast Common Stock or Coast preferred stock or
     any Rights, (ii) enter into any agreement with respect to the foregoing, or
     (iii) permit any additional shares of Coast Common Stock or Coast preferred
     stock to become subject to new grants of employee or director stock
     options, other Rights or similar stock-based employee rights.
 
          (c) (i) make, declare, pay or set aside for payment any dividend
     (other than dividends from wholly owned subsidiaries to Coast or another
     wholly owned subsidiary of Coast) on or in respect of, or declare or make
     any distribution on any shares of Coast Common Stock or Coast preferred
     stock or (ii) directly
 
                                       48
<PAGE>   55
 
     or indirectly adjust, split, combine, redeem, reclassify, purchase or
     otherwise acquire, any shares of its capital stock;
 
          (d) enter into or amend or renew any employment, consulting, severance
     or similar agreements or arrangements with any director, officer or
     employee of Coast or its subsidiaries, or hire any new employees at the
     rank of senior vice president or above, or grant any salary or wage
     increase or increase any employee benefit (including incentive or bonus
     payments), except (i) for normal individual increases in compensation to
     employees (other than any senior vice presidents or any employees ranking
     senior to senior vice presidents) in the ordinary course of business
     consistent with past practice as previously disclosed, (ii) for other
     changes that are required by applicable law, (iii) to satisfy contractual
     obligations previously disclosed and existing as of the date of the Merger
     Agreement, or (iv) for grants of awards to newly hired employees consistent
     with past practice and as previously disclosed, (v) agreements to provide
     retention bonuses to employees made in accordance with the terms of the
     Merger Agreement, (vi) the annual rollover of executive employment
     agreements as previously disclosed or (vii) agreements to provide bonuses
     for the 1997 calendar year consistent with past practice up to an aggregate
     of $1.9 million;
 
          (e) enter into, establish, adopt or amend (except (i) as may be
     required by applicable law, (ii) to satisfy contractual obligations
     previously disclosed and existing as of the date of the Merger Agreement or
     (iii) as otherwise provided in the Merger Agreement) any pension,
     retirement, stock option, stock purchase, savings, profit sharing, deferred
     compensation, consulting, bonus, group insurance or other employee benefit,
     incentive or welfare contract, plan or arrangement, or any trust agreement
     (or similar arrangement) related thereto, in respect of any director,
     officer or employee of Coast or its subsidiaries, or take any action to
     accelerate the vesting or exercisability of stock options, restricted stock
     or other compensation or benefits payable thereunder;
 
          (f) except as previously disclosed, sell, transfer, mortgage, encumber
     or otherwise dispose of or discontinue any of its assets, deposits,
     business or properties except in the ordinary course of business and in a
     transaction that is not material to Coast and its subsidiaries taken as a
     whole;
 
          (g) except as previously disclosed, acquire (other than by way of
     foreclosures or acquisitions of control in a bona fide fiduciary capacity
     or in satisfaction of debts previously contracted in good faith, in each
     case in the ordinary and usual course of business consistent with past
     practice) all or any portion of, the assets, business, deposits or
     properties of any other entity except in the ordinary course of business
     and in a transaction that is not material to Coast and its subsidiaries
     taken as a whole;
 
          (h) amend the Coast Charter, Coast By-laws or the certificate of
     incorporation or by-laws (or similar governing documents) of any of Coast's
     subsidiaries;
 
          (i) implement or adopt any change in its accounting principles,
     practices or methods, other than as may be required by generally accepted
     accounting principles;
 
          (j) (i) amend, or take any action adverse to Ahmanson with respect to,
     the Coast Rights Plan (as defined herein) or (ii), except in the ordinary
     course of business consistent with past practice or with the consent of
     Ahmanson (which consent shall not be unreasonably withheld or delayed),
     enter into or terminate any contract material to its assets, business or
     operations or amend or modify in any material respect any such existing
     material contract;
 
          (k) except in the ordinary course of business consistent with past
     practice or with the consent of Ahmanson (which consent shall not be
     unreasonably withheld or delayed), settle any claim, action or proceeding
     against it, except for any claim, action or proceeding involving solely
     money damages in an amount, individually or in the aggregate for all such
     settlements, that is not material to Coast and its subsidiaries, taken as a
     whole and that does not create precedent for claims that are reasonably
     likely to be material to Coast and its subsidiaries taken as a whole;
 
          (l) (i) take any action while knowing that such action would, or is
     reasonably likely to, prevent or impede the Merger from qualifying as a
     reorganization within the meaning of Section 368 of the Code; or
 
                                       49
<PAGE>   56
 
     (ii) take any action that is intended or is known to be reasonably likely
     to result in (A) any of its representations and warranties set forth in the
     Merger Agreement being or becoming untrue in any material respect at any
     time at or prior to the Effective Time, (B) any of the conditions to the
     Merger set forth under "-- Conditions to Consummation" not being satisfied
     or (C) a material violation of any provision of the Merger Agreement
     except, in each case, as may be required by applicable law or regulation;
 
          (m) except as required by applicable law or regulation or with the
     consent of Ahmanson (which consent shall not be unreasonably withheld or
     delayed), (i) implement or adopt any material change in its interest rate
     and other risk management policies, procedures or practices or (ii) fail to
     follow in all material respects its existing policies or practices with
     respect to managing its exposure to interest rate and other risk;
 
          (n) incur any indebtedness for borrowed money other than in the
     ordinary course of business; or
 
          (o) agree or commit to do any of the foregoing.
 
  Ahmanson.
 
     Ahmanson has agreed in the Merger Agreement, unless the prior written
consent of Coast is obtained, and except as otherwise contemplated by the Merger
Agreement, not to:
 
          (a) make, declare, pay or set aside for payment any dividends other
     than quarterly dividends in an amount, and with record and payment dates,
     consistent with past practice (provided that Ahmanson may raise its regular
     quarterly dividend rate by an amount not exceeding 20%);
 
          (b) (i) take any action while knowing that such action would, or is
     reasonably likely to, prevent or impede the Merger from qualifying as a
     reorganization within the meaning of Section 368 of the Code; (ii)
     repurchase any Ahmanson Common Stock or Ahmanson Preferred Stock (as
     defined herein) such that an Ahmanson stockholder vote would be required
     for consummation of the Merger or which would have the effect of a
     recapitalization of Ahmanson or at prices reflecting a significant premium
     to the prices at which the Ahmanson Common Stock is then trading; or (iii)
     take any action that is intended or is known to be reasonably likely to
     result in (A) any of its representations and warranties set forth in the
     Merger Agreement being or becoming untrue in any material respect at any
     time at or prior to the Effective Time, (B) any of the conditions to the
     Merger set forth under "-- Conditions to Consummation" not being satisfied
     or (C) a material violation of any provision of the Merger Agreement
     except, in each case, as may be required by applicable law or regulation;
     or
 
          (c) agree or commit to do any of the foregoing.
 
EXPENSES AND FEES
 
   
     The Merger Agreement provides that each party shall be responsible for all
expenses incurred by it in connection with the Merger Agreement and the
transactions contemplated by the Merger Agreement, except that Ahmanson and
Coast have agreed to share equally all Commission filing fees and all printing
expenses payable in connection with the Registration Statements and this Proxy
Statement/Prospectus. In the event of a termination of the Merger Agreement
under certain circumstances, Coast would be obligated to pay Ahmanson a fee of
$35 million. See "-- Termination; Termination Fee."
    
 
ACCOUNTING TREATMENT
 
     Upon consummation of the Merger, Ahmanson will account for the acquisition
of Coast using the purchase method of accounting. Accordingly, the consideration
to be paid in the Merger will be allocated to assets acquired and liabilities
assumed based on their estimated fair values at the Effective Date. Income (or
loss) of Coast prior to the Effective Date will not be included in income of the
combined company.
 
                                       50
<PAGE>   57
 
STOCK EXCHANGE LISTING OF AHMANSON COMMON STOCK
 
     Ahmanson has agreed to use its reasonable best efforts to list, prior to
the Effective Date, on the NYSE, subject to official notice of issuance, the
shares of Ahmanson Common Stock to be issued to the holders of Coast Common
Stock in the Merger, and such listing is a condition to consummation of the
Merger.
 
RESALES OF AHMANSON COMMON STOCK
 
     The shares of Ahmanson Common Stock issued in connection with the Merger
will be freely transferable under the Securities Act, except for shares issued
to any stockholder who may be deemed to be an "affiliate" (generally including,
without limitation, directors, certain executive officers, and beneficial owners
of 10% or more of any class of capital stock) of Coast for purposes of Rule 145
under the Securities Act as of the date of the Special Meeting. Such affiliates
may not sell their shares of Ahmanson Common Stock acquired in connection with
the Merger except pursuant to an effective registration statement under the
Securities Act or other applicable exemption from the registration requirements
of the Securities Act.
 
     Coast has agreed in the Merger Agreement to use its reasonable best efforts
to cause each person who may be deemed to be an "affiliate" of Coast to execute
and deliver to Ahmanson an agreement pursuant to which such person agrees, among
other things, not to offer to sell, transfer or otherwise dispose of any of the
shares of Ahmanson Common Stock distributed to them pursuant to the Merger
except in compliance with Rule 145 under the Securities Act, or in a transaction
that, in the opinion of counsel reasonably satisfactory to Ahmanson, is
otherwise exempt from the registration requirements of the Securities Act, or in
an offering which is registered under the Securities Act. Ahmanson may place
restrictive legends on certificates representing Ahmanson Common Stock issued to
all persons who are deemed to be "affiliates" of Coast under Rule 145. This
Proxy Statement/Prospectus does not cover resales of Ahmanson Common Stock
received by any person who may be deemed to be an affiliate of Coast.
 
ACQUISITION PROPOSALS
 
     Coast has agreed in the Merger Agreement that it shall not, and shall cause
its subsidiaries and its and its subsidiaries' officers, directors, agents,
advisors and affiliates not to, solicit or encourage inquiries or proposals with
respect to, or engage in any negotiations concerning, or provide any
confidential information to, or have any discussions with, any person relating
to, any tender or exchange offer, proposal for a merger, consolidation or other
business combination involving Coast or any of its subsidiaries or any proposal
or offer to acquire in any manner a substantial equity interest in, or a
substantial portion of the assets or deposits of, Coast or any of its
subsidiaries (an "Acquisition Proposal"), or waive any provision of or amend the
terms of the Coast Rights Plan in respect of an Acquisition Proposal; provided,
however, that the Merger Agreement does not (a) require the Coast Board to
recommend stockholder approval of the Merger following an Acquisition Proposal,
(b) prevent Coast or the Coast Board from (i) engaging in any discussions or
negotiations with, or providing any information to, any person in response to an
unsolicited bona fide written Acquisition Proposal by any such person or (ii)
recommending such an unsolicited bona fide written Acquisition Proposal to the
holders of Coast Common Stock or (c) prevent Coast from waiving any provision of
or amending the terms of the Coast Rights Plan in respect of an Acquisition
Proposal, if and only if, with respect to the actions described in clause (a),
(b) or (c), as applicable, (A) the Coast Board concludes in good faith that the
Acquisition Proposal, if consummated, would result in a transaction more
favorable to holders of Coast Common Stock than the transaction contemplated by
the Merger Agreement, (B) the Coast Board determines in good faith based upon
the advice of outside counsel that such action is legally necessary for it to
act in a manner consistent with its fiduciary duties under applicable law; and
(C) prior to providing any information or data to any person or entering into
discussions or negotiations with any person, the Coast Board notifies Ahmanson
immediately of such inquiries, proposals or offers received by, any such
information requested from, or any such discussions or negotiations sought to be
initiated or continued with Coast or any subsidiary of Coast. Coast has agreed
promptly (within 24 hours) to advise Ahmanson following the receipt by Coast of
any Acquisition Proposal and the substance thereof (including the identity of
the person making such Acquisition Proposal), and to advise Ahmanson of any
developments with respect to such Acquisition Proposal immediately upon the
occurrence thereof.
 
                                       51
<PAGE>   58
 
EARNINGS ESTIMATES
 
     In connection with the announcement of the Merger, Ahmanson announced that
it estimated that the Merger will be accretive to Ahmanson's reported earnings
per share in 1998, 1999 and 2000 by 2%, 4% and 6%, respectively, and to
Ahmanson's cash earnings per share (i.e., reported earnings before amortization
of intangibles) in 1998, 1999 and 2000 by 6%, 10% and 10%, respectively. This
estimate includes Ahmanson's current estimates of annual cost savings equal to
$75 million pre-tax (substantially all of which Ahmanson expects to be able to
achieve within 12 months of the Effective Date) and no revenue enhancements.
Ahmanson estimates it will incur a $75 million pre-tax charge in connection with
the Merger. See "Cautionary Statement Regarding Forward-Looking Statements" on
page 4 hereof.
 
                                APPRAISAL RIGHTS
 
     Record holders of Coast Common Stock are entitled to appraisal rights under
Section 262 of the DGCL ("Section 262"). The following discussion represents a
summary of the material provisions of Section 262. For additional information,
reference is made to the full text of Section 262, which is reprinted in its
entirety as Appendix E to this Proxy Statement/Prospectus. A person having a
beneficial interest in shares of Coast Common Stock held of record in the name
of another person, such as a broker or nominee, must act promptly to cause the
record holder to follow the steps summarized below properly and in a timely
manner to perfect the appraisal rights provided under Section 262.
 
     Under Section 262, where a merger is to be submitted for approval at a
meeting of stockholders, as in the case of the Special Meeting, not less than 20
days prior to the meeting, a constituent corporation must notify each of the
holders of its stock for which appraisal rights are available that such
appraisal rights are available and include in each such notice a copy of Section
262. THIS PROXY STATEMENT/PROSPECTUS SHALL CONSTITUTE SUCH NOTICE TO THE RECORD
HOLDERS OF COAST COMMON STOCK. ANY SUCH STOCKHOLDER WHO WISHES TO EXERCISE SUCH
APPRAISAL RIGHTS SHOULD REVIEW THE FOLLOWING DISCUSSION AND APPENDIX E
CAREFULLY, BECAUSE FAILURE TO TIMELY AND PROPERLY COMPLY WITH THE PROCEDURES
SPECIFIED WILL RESULT IN THE LOSS OF APPRAISAL RIGHTS UNDER THE DGCL. Moreover,
because of the complexities of the procedures for exercising the right to seek
appraisal of the Coast Common Stock, Coast recommends that Coast stockholders
who consider exercising such rights seek the advice of counsel.
 
     Under the DGCL, a record holder of shares of Coast Common Stock who makes
the demand described below with respect to such shares, who continuously is the
record holder of such shares through the Effective Time, who otherwise complies
with the statutory requirements set forth in Section 262 and who neither votes
in favor of approval of the Transaction Proposal nor consents thereto in writing
will be entitled to have their shares of Coast Common Stock appraised by the
Delaware Court of Chancery and to receive payment of the "fair value" of such
shares as described below. Accordingly, in connection with any appraisal
proceeding, the "fair value" of shares of Coast Common Stock is to be determined
as of immediately prior to the CPR Certificate Distribution and the Merger. Such
holders are, in such circumstances, entitled to appraisal rights because they
hold stock of a constituent corporation to the Merger and may be required by the
Merger Agreement to accept consideration in the Merger, at least in part, other
than in the form of Ahmanson Common Stock. Specifically, Ahmanson's entering
into of the Commitment constitutes part of the Merger Consideration to the
stockholders of Coast. Since holders of shares of Coast Common Stock wishing to
exercise appraisal rights must not vote in favor of approval of the Transaction
Proposal, such holders should not deliver unmarked proxies (i.e., proxies
without instructions) to Coast as such proxies will be voted FOR such approval.
 
     A holder of shares of Coast Common Stock wishing to exercise his or her
appraisal rights must deliver to the Secretary of Coast, before the vote on the
Merger Agreement at the Special Meeting, a written demand for appraisal of his
or her shares of Coast Common Stock. Merely voting or delivering a proxy
directing a vote against approval of the Transaction Proposal will not
constitute a demand for appraisal. A written demand is essential. Such written
demand must reasonably inform Coast of the identity of the holder and that such
holder intends thereby to demand appraisal of the holder's shares. All written
demands for appraisal of Coast
 
                                       52
<PAGE>   59
 
Common Stock should be sent or delivered to Coast Savings Financial, Inc., 1000
Wilshire Boulevard, Los Angeles, California 90017, Attn: Corporate Secretary. In
addition, a holder of shares of Coast Common Stock wishing to exercise his or
her appraisal rights must hold such shares of record on the date the written
demand for appraisal is made and must hold such shares continuously through the
Effective Time. A demand for appraisal should be executed by or on behalf of the
stockholder of record, fully and correctly, as such stockholder's name appears
on such stockholder's stock certificates, should specify the stockholder's name
and mailing address, the number of shares of Coast Common Stock owned and that
such stockholder intends thereby to demand appraisal of such stockholder's
stock. However, such demand will be sufficient if it reasonably informs Coast of
the stockholder's identity and intent to demand the appraisal of his shares. If
the shares are owned of record in a fiduciary capacity, such as by a trustee,
guardian or custodian, execution of the demand should be made in that capacity,
and if the shares of the Coast Common Stock are owned of record by more than one
person, as in a joint tenancy or tenancy in common, the demand should be
executed by or on behalf of all joint owners. An authorized agent, including one
or more joint owners, may execute a demand for appraisal on behalf of a holder
of record; however, the agent must identify the record owner or owners and
expressly disclose the fact that in executing the demand for appraisal, the
agent is agent for such owner or owners. A record holder (such as a broker) who
holds shares of Coast Common Stock as a nominee for several beneficial owners
may exercise appraisal rights with respect to the shares of Coast Common Stock
held for one or more beneficial owners while not exercising such rights with
respect to the shares of Coast Common Stock held for other beneficial owners; in
such case, the written demand should set forth the number of shares as to which
appraisal is sought and where no number of shares is expressly mentioned, the
demand will be presumed to cover all shares of Coast Common Stock held in the
name of the record owner. Stockholders who hold their shares of Coast Common
Stock in brokerage accounts or other nominee forms and who wish to exercise
appraisal rights must take all necessary steps in order that a demand for
appraisal is made by the record holder of such shares and are urged to consult
with their brokers to determine the appropriate procedures for the making of a
demand for appraisal by the record holder.
 
     Within ten days after the Effective Time of the Merger, Ahmanson, as the
surviving corporation, must send a notice as to the effectiveness of the Merger
to each person who has satisfied the appropriate provisions of Section 262 and
who is entitled to appraisal rights under Section 262. Within 120 days after the
Effective Time, any holder of record of shares of Coast Common Stock who has
complied with the requirements for exercise of appraisal rights will be
entitled, upon written request, to receive from the surviving corporation, a
statement setting forth (a) the aggregate number of shares of Coast Common Stock
not voted in favor of the Merger Agreement and with respect to which demands for
appraisal have been received and (b) the aggregate number of holders of such
shares. Any such statement must be mailed within ten days after a written
request therefor has been received by Ahmanson, as the surviving corporation.
 
     Within 120 days after the Effective Time, but not thereafter, Ahmanson, as
the surviving corporation, or any holder of shares of Coast Common Stock who has
complied with the foregoing procedures and who is entitled to appraisal rights
under Section 262 may file a petition in the Delaware Court of Chancery
demanding a determination of the "fair value" of such shares. Ahmanson, as the
surviving corporation, is not under any obligation to file a petition with
respect to the appraisal of the "fair value" of the shares of Coast Common Stock
and neither Ahmanson nor Coast presently intends that Ahmanson, as the surviving
corporation, file such a petition. Accordingly, it is the obligation of the
stockholders to initiate all necessary action to perfect their appraisal rights
within the time prescribed in Section 262. A holder of shares of Coast Common
Stock will fail to perfect, or effectively lose, his or her right to appraisal
if no petition for appraisal of shares of Coast Common Stock is filed within 120
days after the Effective Time.
 
     If a petition for an appraisal is timely filed, after a hearing on such
petition, the Delaware Court of Chancery will determine the holders of shares of
Coast Common Stock entitled to appraisal rights and will appraise the "fair
value" of the shares of Coast Common Stock, exclusive of any element of value
arising from the accomplishment or expectation of the Merger. Holders
considering seeking appraisal should be aware that the "fair value" of their
shares of Coast Common Stock as determined under Section 262 could be more than,
the same as, or less than the value of the merger consideration they would
receive if they did not seek appraisal. The Delaware Supreme Court has stated
that "proof of value by any techniques or methods which
 
                                       53
<PAGE>   60
 
are generally considered acceptable in the financial community and otherwise
admissible in court" should be considered in the appraisal proceedings. The
Delaware Supreme Court has also stated that, in making this determination of
fair value, the court must consider market value, asset value, dividends,
earnings prospects, the nature of the enterprise and any other facts which could
be ascertained as of the date of the merger that throw any light on future
prospects of the merged corporation. The Delaware Supreme Court has also stated
that "elements of future value, including the nature of the enterprise, which
are known or susceptible of proof as of the date of the merger and not the
product of speculation, may be considered." In addition, Delaware courts have
decided that the statutory appraisal remedy, depending on factual circumstances,
may or may not be a dissenter's exclusive remedy.
 
     The Delaware Court of Chancery will determine the amount of interest, if
any, to be paid upon the amounts to be received by persons whose shares of Coast
Common Stock have been appraised. The costs of the action may be determined by
such court and taxed upon the parties as the court deems equitable. The Delaware
Court of Chancery may also order that all or a portion of the expenses incurred
by any holder of shares of Coast Common Stock in connection with an appraisal,
including, without limitation, reasonable attorneys' fees and the fees and
expenses of experts utilized in the appraisal proceeding, be charged pro rata
against the value of all of the shares of Coast Common Stock entitled to
appraisal.
 
     A holder may withdraw his or her demand for appraisal by delivering to
Ahmanson, as the surviving corporation, a written withdrawal of his or her
demand for appraisal and acceptance of the Merger, except that any such attempt
to withdraw made more than 60 days after the Effective Time will require the
written approval of Ahmanson, as the surviving corporation. Failure to follow
the steps required by Section 262 for perfecting appraisal rights will result in
the loss of such rights.
 
     Any holder of shares of Coast Common Stock who has duly demanded an
appraisal in compliance with Section 262 will not, after the Effective Time, be
entitled to vote the shares of Coast Common Stock subject to such demand for any
purpose or be entitled to the payment of dividends or other distributions on
those shares (except dividends or other distributions payable to holders of
record of shares of Coast Common Stock as of a date prior to the Effective
Time).
 
     Each CPR Certificate distributed to each Coast stockholder provides that it
shall automatically be redeemed by Ahmanson, as the surviving corporation, for
$0.01 in cash immediately following the Merger if the holder of the share as to
which such CPR Certificate was issued has given notice of an intent to exercise
appraisal rights (if any). If any such Coast stockholder subsequently withdraws,
or fails to perfect, such appraisal demand, Ahmanson will deliver to such holder
CPR Certificates as to the number of Coast shares as to which such appraisal
demand was withdrawn or not perfected.
 
     It is a condition to the obligation of Ahmanson to consummate the Merger
that holders of no more than 5% of the outstanding shares of Coast Common Stock
shall have given notice that their shares of Coast Common Stock be treated as
Dissenters' Shares.
 
     FAILURE TO COMPLY STRICTLY WITH THE PROCEDURES SET FORTH IN SECTION 262 OF
THE DGCL WILL RESULT IN THE LOSS OF A COAST STOCKHOLDER'S STATUTORY APPRAISAL
RIGHTS WITH RESPECT TO SHARES OF COAST COMMON STOCK. CONSEQUENTLY, ANY COAST
STOCKHOLDER WISHING TO EXERCISE APPRAISAL RIGHTS IS URGED TO CONSULT LEGAL
COUNSEL BEFORE ATTEMPTING TO EXERCISE SUCH RIGHTS.
 
                                       54
<PAGE>   61
 
                          AHMANSON AND COAST UNAUDITED
                    PRO FORMA COMBINED FINANCIAL INFORMATION
 
   
     The following unaudited pro forma combined financial statements were
prepared in connection with the proposed Merger (in which each outstanding share
of Coast Common Stock will be exchanged for 0.8082 of a share of Ahmanson Common
Stock, valued for purposes of accounting for the Merger at a price per share of
Ahmanson Common Stock of $56.45, based on the quoted market price of Ahmanson
Common Stock for a period of time shortly before and after the points in time
Ahmanson and Coast reached agreement on the purchase price and the terms and
conditions of the proposed Merger were publicly announced), and give effect to
the purchase accounting adjustments and other assumptions described in the
accompanying notes. The unaudited pro forma combined statement of financial
condition is based upon the condensed consolidated statements of financial
condition (unaudited) of Ahmanson and Coast as of September 30, 1997. The
unaudited pro forma combined statement of operations for the year ended December
31, 1996 is based upon the consolidated statements of operations of Ahmanson and
Coast for the year ended December 31, 1996. The unaudited pro forma combined
statement of operations for the nine months ended September 30, 1997 is based
upon the condensed consolidated statement of operations (unaudited) of Ahmanson
and Coast for the nine months ended September 30, 1997.
    
 
     The adjustments included in the unaudited pro forma combined financial
statements are subject to update as additional information becomes available. An
increase in the unallocated portion of the purchase price remaining after fair
value adjustments will result in a greater final allocation to goodwill, which
will increase amortization expense and will reduce tangible common equity. A
decrease in the unallocated portion of the purchase price remaining after fair
value adjustments will have the opposite effects. Any CPR Certificates received
by Ahmanson in connection with the Merger will be recorded at fair value and
will also reduce goodwill. Accordingly, the final pro forma combined amounts
will differ from those set forth in the unaudited pro forma combined financial
statements set forth herein.
 
     The information shown below should be read in conjunction with, and is
qualified in its entirety by reference to, the consolidated statement of
financial condition and consolidated statement of operations at and for the year
ended December 31, 1996 of Ahmanson and the consolidated statement of financial
condition and consolidated statement of operations at and for the year ended
December 31, 1996 of Coast. The pro forma data are presented for informational
purposes and are not necessarily indicative of the financial position or the
results of operations of the combined company that actually would have occurred
had the Merger been consummated as of the dates or at the beginning of the
periods presented. The pro forma amounts are also not necessarily indicative of
the future financial position or future results of operations of Ahmanson as the
surviving corporation. In particular, Ahmanson expects to achieve significant
operating cost savings as a result of the Merger. These cost savings, assuming
they are realized, would significantly reduce non-interest expense and increase
net income. Additionally, Ahmanson believes opportunities exist to enhance
certain revenues through the expansion of consumer and business loans, cash
management services, retail banking and investment sales generated through Coast
Federal branches. These revenue enhancements, if they are realized (which cannot
be assured as to amount or timing), would increase net interest income or fee
income and increase net income. No adjustment has been included in the pro forma
amounts for such cost savings or revenue enhancements.
 
                                       55
<PAGE>   62
 
                               AHMANSON AND COAST
              PRO FORMA COMBINED STATEMENT OF FINANCIAL CONDITION
                               SEPTEMBER 30, 1997
                                  (UNAUDITED)
 
   
<TABLE>
<CAPTION>
                                                       HISTORICAL
                                                    ----------------    PRO FORMA     PRO FORMA
                                                    AHMANSON  COAST    ADJUSTMENTS     COMBINED
                                                    --------- ------   ------------   ----------
                                                                   (IN MILLIONS)
<S>                                                 <C>       <C>      <C>            <C>
ASSETS
Cash and investment securities....................  $ 1,084   $  592        $ --        $ 1,676
Mortgage-backed securities (MBS)..................   13,157    2,068          11         15,236
Loans, net of the allowance for loan losses.......   30,684    6,068          12         36,764
Goodwill and core deposit intangibles.............      286        5         416            707
Other assets......................................    1,588      307          --          1,895
                                                    -------   ------        ----        -------
  Total assets....................................  $46,799   $9,040        $439        $56,278
                                                    =======   ======        ====        =======
LIABILITIES, COMPANY-OBLIGATED CAPITAL SECURITIES
OF SUBSIDIARY TRUST AND STOCKHOLDERS' EQUITY
Deposits..........................................  $32,447   $6,446        $ 10        $38,903
Borrowings........................................   10,576    1,989           6         12,571
Other liabilities.................................    1,242      135          42          1,419
                                                   --------   ------        ----        -------
  Total liabilities...............................   44,265    8,570          58         52,893
Company-obligated Capital Securities of Subsidiary
  Trust...........................................      148       --          --            148
Stockholders' equity
Preferred stock...................................      483       --          --            483
Common stock......................................        1       --          --              1
Additional paid-in capital, net of treasury
  stock...........................................     (165)     267         584            686
Retained earnings.................................    2,071      202        (202)         2,071
Other.............................................       (4)       1          (1)            (4)
                                                    -------   ------        ----        -------
  Total stockholders' equity......................    2,386      470         381          3,237
                                                    -------   ------        ----        -------
  Total liabilities, Company-obligated Capital
     Securities of Subsidiary Trust and
     stockholders' equity.........................  $46,799   $9,040        $439        $56,278
                                                    =======   ======        ====        =======
</TABLE>
    
 
       See accompanying Notes to Pro Forma Combined Financial Statements.
 
                                       56
<PAGE>   63
 
                               AHMANSON AND COAST
                   PRO FORMA COMBINED STATEMENT OF OPERATIONS
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                         HISTORICAL
                                                     ------------------      PRO FORMA      PRO FORMA
                                                     AHMANSON     COAST     ADJUSTMENTS     COMBINED
                                                     --------     -----     -----------     ---------
                                                       (IN MILLIONS, EXCEPT PER COMMON SHARE DATA)
<S>                                                  <C>          <C>       <C>             <C>
Interest income
Loans............................................     $1,733       $359         $ (2)         $2,090
MBS..............................................        777         97           (1)            873
Other............................................         51         17           --              68
                                                      ------       ----         ----          ------
  Total interest income..........................      2,561        473           (3)          3,031
                                                      ------       ----         ----          ------
Interest expense
Deposits.........................................      1,115        220           (4)          1,331
Borrowings.......................................        518         87           --             605
                                                      ------       ----         ----          ------
  Total interest expense.........................      1,633        307           (4)          1,936
                                                      ------       ----         ----          ------
Net interest income..............................        928        166            1           1,095
Provision for loan losses........................         57         21           --              78
                                                      ------       ----         ----          ------
Net interest income after provision for loan
  losses.........................................        871        145            1           1,017
                                                      ------       ----         ----          ------
Non-interest income..............................        265         37           --             302
Non-interest expense.............................        635        120           17             772
                                                      ------       ----         ----          ------
Income before income taxes.......................        501         62          (16)            547
Income taxes.....................................        187         17           (2)            202
                                                      ------       ----         ----          ------
Net income.......................................     $  314       $ 45         $(14)         $  345
                                                      ======       ====         ====          ======
Net income applicable to common stock............     $  289       $ 45         $(14)         $  320
                                                      ======       ====         ====          ======
Net income per common share
  Primary........................................     $ 2.89                                  $ 2.78
                                                      ======                                  ======
  Fully diluted..................................     $ 2.69                                  $ 2.61
                                                      ======                                  ======
Dividends declared...............................     $ 0.66                                  $ 0.66
                                                      ======                                  ======
Weighted average common shares outstanding
  Primary........................................      100.0                    15.1           115.1
                                                      ======                    ====          ======
  Fully diluted..................................      112.4                    15.1           127.5
                                                      ======                    ====          ======
</TABLE>
 
       See accompanying Notes to Pro Forma Combined Financial Statements.
 
                                       57
<PAGE>   64
 
                               AHMANSON AND COAST
                   PRO FORMA COMBINED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 30, 1996
                                  (UNAUDITED)
 
   
<TABLE>
<CAPTION>
                                                             HISTORICAL
                                                          -----------------    PRO FORMA    PRO FORMA
                                                          AHMANSON    COAST   ADJUSTMENTS   COMBINED
                                                          --------    -----   -----------   ---------
                                                          (IN MILLIONS, EXCEPT PER COMMON SHARE DATA)
<S>                                                       <C>         <C>     <C>           <C>
Interest income
Loans...................................................   $2,297      $450       $ (2)       $2,745
MBS.....................................................    1,161       132         (2)        1,291
Other...................................................       57        22         --            79
                                                           ------      ----       ----        ------
  Total interest income.................................    3,515       604         (4)        4,115
                                                           ------      ----       ----        ------
Interest expense
Deposits................................................    1,524       286         (5)        1,805
Borrowings..............................................      738       103         --           841
                                                           ------      ----       ----        ------
  Total interest expense................................    2,262       389         (5)        2,646
                                                           ------      ----       ----        ------
Net interest income.....................................    1,253       215          1         1,469
Provision for loan losses...............................      145        70         --           215
                                                           ------      ----       ----        ------
Net interest income after provision for loan losses.....    1,108       145          1         1,254
                                                           ------      ----       ----        ------
Non-interest income.....................................      252        50         --           302
Non-interest expense
SAIF recapitalization...................................      244        42         --           286
Other...................................................      935       164         23         1,122
                                                           ------      ----       ----        ------
  Total non-interest expense............................    1,179       206         23         1,408
                                                           ------      ----       ----        ------
Income before income taxes..............................      181       (11)       (22)          148
Income tax expense (benefit)............................       35       (22)        (4)            9
                                                           ------      ----       ----        ------
Net income..............................................   $  146      $ 11       $(18)       $  139
                                                           ======      ====       ====        ======
Net income applicable to common stock...................   $  100      $ 11       $(18)       $   93
                                                           ======      ====       ====        ======
Net income per common share
  Primary...............................................   $ 0.91                             $ 0.75
                                                           ======                             ======
  Fully diluted.........................................   $ 0.91                             $ 0.74
                                                           ======                             ======
Dividends declared......................................   $ 0.88                             $ 0.88
                                                           ======                             ======
Weighted average common shares outstanding
  Primary...............................................    109.7                 15.1         124.8
                                                           ======                 ====        ======
  Fully diluted.........................................    109.7                 15.1         124.8
                                                           ======                 ====        ======
</TABLE>
    
 
       See accompanying Notes to Pro Forma Combined Financial Statements.
 
                                       58
<PAGE>   65
 
                               AHMANSON AND COAST
                NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
NOTE A: BASIS OF PRESENTATION
 
     The unaudited pro forma combined statement of financial condition combines
the historical consolidated statements of financial condition (unaudited) of
Ahmanson and Coast as if the Merger had become effective on September 30, 1997.
The unaudited pro forma combined statement of operations for the year ended
December 31, 1996 combines the audited historical consolidated statements of
operations of Ahmanson and Coast as if the Merger had become effective prior to
January 1, 1996. The unaudited pro forma combined statement of operations for
the nine months ended September 30, 1997 combines the historical condensed
consolidated statements of operations (unaudited) of Ahmanson and Coast as if
the Merger had become effective prior to January 1, 1997. Certain items in the
unaudited pro forma combined financial statements related to Coast have been
reclassified to conform to the Ahmanson presentation.
 
     The Merger will be accounted for as a purchase. Under this method of
accounting, assets and liabilities of Coast are adjusted to their estimated fair
value and combined with the recorded book values of the assets and liabilities
of Ahmanson. Applicable income tax effects of such adjustments are included as a
component of Ahmanson's net deferred tax asset with a corresponding offset to
goodwill.
 
     For purposes of the pro forma financial statements, estimates of the fair
value of Coast's assets and liabilities as of September 30, 1997 have been
combined with the recorded values of the assets and liabilities of Ahmanson.
Fair value adjustments are subject to update as additional information becomes
available.
 
     Following the Merger, Ahmanson intends to combine the operations of and,
subject to regulatory approvals, to merge Home Savings and Coast Federal as well
as certain other operations. Ahmanson expects to achieve significant operating
cost savings as a result of the Merger. These cost savings, assuming they are
realized, would significantly reduce non-interest expense and increase net
income. Additionally, Ahmanson believes opportunities exist to enhance certain
revenues through the expansion of consumer and business loans, cash management
services, retail banking and investment sales generated through Coast Federal
branches. These revenue enhancements, if they are realized (which cannot be
assured as to amount or timing), would increase net interest income or fee
income and increase net income. No adjustment has been included in the unaudited
pro forma combined financial statements for such cost savings or revenue
enhancements.
 
NOTE B: PURCHASE PRICE
 
     The purchase price is based on exchanging 0.8082 of a share of Ahmanson
Common Stock for each outstanding share of Coast Common Stock. Shares issuable
upon the exercise of Coast Stock Options are not included in the number of
outstanding shares of Coast Common Stock on the assumption that all options will
become equivalent options to purchase Ahmanson Common Stock. In addition, the
number of the shares of Coast Common Stock used in calculating the total market
value of Ahmanson Common Stock to be issued in connection with the Merger
reflects an exchange of Ahmanson Common Stock for the outstanding shares of
Coast Common Stock, exclusive of Coast's common stock equivalents, which include
Coast Stock Options.
 
     The total market value of the Ahmanson Common Stock to be issued in
connection with the Merger is calculated as follows:
 
   
<TABLE>
    <S>                                                                          <C>
    Coast's common shares outstanding on September 30, 1997 (in thousands).....   18,644
    Exchange ratio.............................................................   0.8082
                                                                                 -------
    Ahmanson Common Stock to be issued (in thousands)..........................   15,068
    Value per share of Ahmanson Common Stock...................................  $ 56.45
                                                                                 -------
      Total market value of Ahmanson Common Stock to be issued (in millions)...  $   851
                                                                                 =======
</TABLE>
    
 
                                       59
<PAGE>   66
 
                               AHMANSON AND COAST
        NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
     The shares of Ahmanson Common Stock to be issued to the stockholders of
Coast in connection with the proposed Merger have been valued at $56.45 per
share for purposes of the pro forma consolidated financial statements, based on
the quoted market price of Ahmanson Common Stock for a period of time shortly
before and after the points in time Ahmanson and Coast reached agreement on the
purchase price and the terms and conditions of the proposed Merger were publicly
announced.
 
     In addition to the total market value of the Ahmanson Common Stock to be
issued, the total purchase price will include other direct acquisition costs,
such as investment banking, legal, accounting and other professional fees;
printing and mailing costs; Commission filing fees and other miscellaneous
expenses. These costs, which are not expected to be material to the transaction
and are preliminarily expected to be approximately $10 million, have not been
included in the unaudited pro forma combined financial statements.
 
NOTE C: RESTRUCTURING CHARGES
 
     Ahmanson's management estimates that approximately $75 million of costs
related to premises, severance and other restructuring charges will be incurred
in connection with the Merger; these estimates of costs are not yet based on
sufficient factual data so as to be included as adjustments to the unaudited pro
forma combined financial statements and are subject to change as additional
information becomes available. Of this amount, approximately $57 million of
costs relate to Coast's premises, employees and operations and will affect the
final amount of goodwill as of the consummation of the Merger, which goodwill
will be amortized as described in Note G below. The remaining estimated amount
of approximately $18 million of costs relates to Ahmanson's premises, employees
and operations, as well as all costs relating to systems conversions and other
indirect integration costs, and will be expensed, either upon consummation of
the Merger or as incurred. With respect to timing, it has been assumed that the
integration will be complete and that the costs referred to above will be
incurred not later than 12 months after the closing of the Merger.
 
     The estimated restructuring charges are expected to be incurred as set
forth in the following table:
 
<TABLE>
<CAPTION>
        (IN MILLIONS)
        -------------
        <S>                                                                      <C>
        Owned premises.........................................................  $25
        Leased premises........................................................   10
        Severance..............................................................   22
        Other restructuring....................................................   18
                                                                                 ---
                  Total restructuring..........................................  $75
                                                                                 ===
</TABLE>
 
     Ahmanson's management estimates that the total severance costs in
connection with the Merger will be approximately $22 million. The estimate is
based on anticipated aggregate terminations, assumptions regarding severance
benefits on an aggregate basis and Ahmanson's experience in the integration of
mergers and does not reflect any information as to which employees will be
terminated as this information is not yet available.
 
     Ahmanson's estimate of $75 million in restructuring charges is in the range
of restructuring charges announced in connection with other similar transactions
and is based on the assumption that Ahmanson's experience in integrating Coast's
organization and operations will be similar to comparable transactions in the
past.
 
                                       60
<PAGE>   67
 
                               AHMANSON AND COAST
        NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
NOTE D: ALLOCATION OF PURCHASE PRICE
 
     Certain matters are still pending that will have an effect on the ultimate
allocation of the purchase price. Accordingly, the allocation of the purchase
price has not been finalized and the portion of the purchase price allocated to
fair value adjustments, goodwill and the identifiable intangibles (discussed
below) is subject to change.
 
     Subject to the foregoing, the purchase price has been allocated as
described in the table below:
 
<TABLE>
<CAPTION>
    (IN MILLIONS)
    ----------------------------------------------------------------------
    <S>                                                                     <C>     <C>
    Net assets applicable to Coast's common stock at September 30, 1997...          $ 470
    Increase (decrease) to Coast's net asset value at September 30, 1997
      as a result of estimated fair value adjustments (see Note G)*
      Loans...............................................................    7
      MBS.................................................................    7
      Deposits............................................................   (6)
      Borrowings..........................................................   (4)
                                                                            ---
      Estimated fair value adjustments (total excluding core deposit
         intangibles).....................................................    4
      Core deposit intangibles............................................   58
                                                                            ---
              Total estimated fair value adjustments......................             62
    Elimination of Coast's existing goodwill, net of applicable income tax
      effects.............................................................             (5)
                                                                                    -----
              Total preliminary allocation of purchase price..............            527
    Goodwill due to the Merger............................................            324
                                                                                    -----
              Total purchase price........................................          $ 851
                                                                                    =====
</TABLE>
 
- ---------------
 
* Amounts are net of applicable income tax effects, using an estimated marginal
tax rate of 40.0%.
 
NOTE E: CALCULATION OF GOODWILL ADJUSTMENT AND TOTAL GOODWILL DUE TO MERGER
 
<TABLE>
<CAPTION>
    (IN MILLIONS)
    ---------------------------------------------------------------------------
    <S>                                                                            <C>
    Purchase price.............................................................    $ 851
    Coast total common stockholders' equity....................................     (470)
    Estimated fair value adjustments (excluding core deposit intangibles)*.....       (4)
    Core deposit intangibles*..................................................      (58)
                                                                                   -----
    Goodwill adjustment........................................................      319
    Coast existing goodwill....................................................        5
                                                                                   -----
    Total goodwill due to Merger...............................................    $ 324
                                                                                   =====
</TABLE>
 
- ---------------
 
* Net of applicable income tax effects.
 
     For purposes of the pro forma combined Statement of Financial Condition,
estimates have been made of the fair value of Coast's assets and liabilities as
of September 30, 1997.
 
                                       61
<PAGE>   68
 
                               AHMANSON AND COAST
        NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
NOTE F: STOCKHOLDERS' EQUITY
 
   
     In the Merger, Ahmanson will issue 0.8082 of a share of Ahmanson Common
Stock in exchange for each of the 18,644,177 outstanding shares of Coast Common
Stock (based on the number of shares outstanding as of September 30, 1997).
    
 
     Adjustments to stockholders' equity are as follows:
 
<TABLE>
<CAPTION>
                                                                        COAST
                                                           PURCHASE     COMMON
    (IN MILLIONS)                                           PRICE       EQUITY     ADJUSTMENT
    -------------                                          --------     ------     ----------
    <S>                                                    <C>          <C>        <C>
    Common stock.........................................    $ --       $  --         $ --
    Additional paid-in capital...........................     851        (267)         584
    Retained earnings....................................      --        (202)        (202)
    Other (net unrealized gains on
      available-for-sale-securities).....................      --          (1)          (1)
                                                             ----       -----         ----
    Total common stockholders' equity....................    $851       $(470)        $381
                                                             ====       =====         ====
</TABLE>
 
NOTE G: PURCHASE ACCOUNTING ADJUSTMENTS
 
     Adjustments are made to reflect recording the tangible assets and
liabilities at fair value and identifiable and unidentifiable intangibles as
well as to eliminate any intangible balances previously recorded by Coast in
accordance with the purchase method of accounting. Purchase accounting
adjustments as of September 30, 1997 will be booked on a gross basis with
related adjustments to Ahmanson's net deferred tax asset as follows:
 
   
<TABLE>
<CAPTION>
                                                                                               RELATED
                                                                               RELATED        (INCREASE)
                                                                             (INCREASE)      DECREASE TO
                                                                             DECREASE TO      NET INCOME
                                                     NET OF                 NET INCOME        FOR NINE
                                                   APPLICABLE                FOR YEAR          MONTHS
                                                     INCOME                    ENDED           ENDED
(IN MILLIONS)                                         TAXES        GROSS      12/31/96         9/30/97
- ------------                                       ----------     -----     -----------     ------------
DEBIT (CREDIT)

<S>                                                 <C>            <C>       <C>             <C>
Estimated fair value adjustments*
  Loans...........................................     $  7         $ 12         $ 2              $ 2
  MBS.............................................        7           11           2                1
  Deposits........................................       (6)         (10)         (5)              (4)
  Borrowings......................................       (4)          (6)         --               --
                                                       ----         ----         ---              ---
Estimated fair value adjustments (total excluding
  core deposit intangibles).......................        4            7          (1)              (1)
Goodwill and core deposit intangibles of Coast
  ................................................       (5)          (5)         --               --
Goodwill due to the Merger*.......................      324          324          13               10
Core deposit intangibles due to the Merger*.......       58           97          10                7
                                                       ----         ----         ---              ---
                                                        381          423          22               16
Adjustment to Ahmanson net deferred tax liability
  related to purchase accounting adjustments......       --          (42)         (4)              (2)
                                                       ----         ----         ---              ---
Total.............................................     $381         $381         $18              $14
                                                       ====         ====         ===              ===
</TABLE>
    
 
- ---------------
 
* Goodwill due to the Merger will be amortized on a straight-line basis over 25
  years. Core deposit intangibles due to the Merger will be amortized on a
  straight-line basis over 10 years. Fair value adjustments will be amortized
  over the estimated remaining life of the related asset or liability.
 
                                       62
<PAGE>   69
 
                               AHMANSON AND COAST
        NOTES TO PRO FORMA COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
     The incremental effect on net income of the purchase accounting adjustments
is estimated to be a net after-tax expense of approximately $18 million for the
first and second 12-month periods subsequent to the Merger, and approximately
$21 million for the third, fourth and fifth 12-month periods subsequent to the
Merger. Amounts exclude amortization of existing goodwill of Coast.
 
NOTE H: OTHER LIABILITIES
 
     Adjustments to other liabilities are as follows:
 
<TABLE>
<CAPTION>
    (IN MILLIONS)
    -------------
    <S>                                                                              <C>
    Deferred tax liability from fair value adjustments.............................  $ 3
      (excluding core deposit intangibles)
    Deferred tax liability from core deposit intangibles...........................   39
                                                                                     ---
              Total adjustment to other liabilities................................  $42
                                                                                     ===
</TABLE>
 
                                       63
<PAGE>   70
 
                     DESCRIPTION OF AHMANSON CAPITAL STOCK
 
AHMANSON COMMON STOCK
 
     Ahmanson is currently authorized to issue up to 220,000,000 shares of
Ahmanson Common Stock. As of September 30, 1997, there were 94,411,284 shares of
Ahmanson Common Stock issued and outstanding, outstanding options to purchase an
additional 3,430,419 shares of Ahmanson Common Stock and 11,814,238 shares of
Ahmanson Common Stock issuable upon conversion of the Ahmanson Series D
Preferred Stock (as defined herein).
 
     Since 1995, Ahmanson has been engaged in stock repurchase programs. For a
description of these programs see "-- Repurchases of Ahmanson Common Stock."
 
     Holders of shares of Ahmanson Common Stock are entitled to one vote per
share for each share held.
 
     Subject to the rights of holders of shares of the Ahmanson Preferred Stock
(as described below), holders of shares of Ahmanson Common Stock are entitled to
receive such dividends as may be declared by the Ahmanson Board from funds
legally available therefor and, in the event of liquidation, from the net assets
of Ahmanson available for distribution to stockholders. Ahmanson may not declare
any dividends on the Ahmanson Common Stock (other than in shares of Ahmanson
Common Stock) unless full preferential amounts to which holders of Ahmanson
Preferred Stock are entitled have been paid or declared and set apart for
payment upon all outstanding shares of Ahmanson Preferred Stock. Ahmanson is
also subject to regulatory restrictions on the payment of dividends. See
"-- Certain Regulatory Considerations."
 
     The holders of shares of Ahmanson Common Stock do not have preemptive
rights or preferential rights of subscription for any shares of Ahmanson Common
Stock or other securities of Ahmanson. Outstanding shares of Ahmanson Common
Stock are, and shares to be issued in the Merger will be, validly issued, fully
paid and nonassessable.
 
     The Ahmanson Common Stock is listed on the NYSE and the Pacific Exchange.
Application will be made to list the shares of Ahmanson Common Stock to be
issued in the Merger on the NYSE and the Pacific Exchange.
 
     For a description of the Ahmanson Rights Plan, see "Certain Differences in
the Rights of Ahmanson Stockholders and Coast Stockholders."
 
REPURCHASES OF AHMANSON COMMON STOCK
 
     Starting with the fourth quarter of 1995, Ahmanson has announced four stock
purchase programs. As of September 30, 1997, Ahmanson had purchased an aggregate
of 25.8 million shares of Ahmanson Common Stock at an average purchase price of
$31.68 per share. Of the $250 million authorized for the fourth stock purchase
program, $83.5 million remained available for purchases of Ahmanson Common Stock
at September 30, 1997. Ahmanson intends to continue its repurchase program on
generally the same basis as it has been conducted over the last two years,
although it has suspended its stock repurchase program from the date one
business day prior to the date of mailing of this Proxy Statement/Prospectus
until the consummation of the Merger.
 
     The source of funds for the repurchase plan will be primarily dividends
from Home Savings and other subsidiaries. Home Savings and Ahmanson's other
subsidiaries are projected to generate sufficient cash to provide the dividends
necessary to accomplish the contemplated repurchases while maintaining the
capital of Home Savings at a level sufficient to qualify as "well capitalized"
for regulatory purposes. Anticipated stock repurchases impact earnings per share
in two ways. Earnings per share are increased by reducing shares outstanding and
to a lesser extent earnings per share are decreased by lower net interest
margins.
 
AHMANSON PREFERRED STOCK
 
     The certificate of incorporation of Ahmanson (the "Ahmanson Charter")
provides that Ahmanson is authorized to issue 10,000,000 shares of Ahmanson
Preferred Stock. The Ahmanson Preferred Stock may be
 
                                       64
<PAGE>   71
 
issued from time to time in one or more series and the Ahmanson Board is
authorized to fix the voting rights, designations, powers, preferences and the
relative, participating, optional or other rights, if any, and the
qualifications, limitations or restrictions thereof, of any wholly unissued
series of Ahmanson Preferred Stock, and to fix the number of shares constituting
such series, and to increase or decrease the number of shares of any such
series, all without further action by the holders of Ahmanson Common Stock.
 
     Because Ahmanson is a holding company, its rights, the rights of its
creditors and of its stockholders, including the holders of the shares of the
Ahmanson Preferred Stock, to participate in any distribution of the assets of
any subsidiary upon the latter's liquidation or recapitalization will be subject
to the prior claims of the subsidiary's creditors, except to the extent that
Ahmanson may itself be a creditor with recognized claims against the subsidiary.
The principal source of Ahmanson's revenues are dividends received from its
banking and other subsidiaries. Various statutory provisions limit the amount of
dividends its banking subsidiaries may pay without regulatory approval, and
various regulations can also restrict the payment of dividends. In addition,
federal statutes limit the ability of certain subsidiaries to make loans to
Ahmanson. See "-- Certain Regulatory Considerations."
 
     The following is a brief description of certain terms of the outstanding
series of Ahmanson Preferred Stock. This description does not purport to be
complete and is qualified in its entirety by reference to the Ahmanson
Certificate, including the certificate of designations with respect to each such
series.
 
     The shares of Ahmanson Preferred Stock currently outstanding have
preference over Ahmanson Common Stock with respect to the payment of dividends
and the distribution of assets in the event of liquidation, winding up or
dissolution of Ahmanson. Each outstanding series ranks on a parity with the
other as to dividends and the distribution of assets upon liquidation, winding
up or dissolution.
 
     Generally, the holders of each series of Ahmanson Preferred Stock have no
voting rights. However, if the equivalent of six quarterly dividends payable on
a series of Ahmanson Preferred Stock are in default, the number of directors of
Ahmanson will be increased by two and the holders of such outstanding series of
Ahmanson Preferred Stock together with the holders of shares of every other
series of Ahmanson Preferred Stock similarly entitled to vote for the election
of two directors, acting together as a single class, will be entitled to elect
two of the authorized number of members of the Ahmanson Board at the next annual
meeting and at each subsequent annual meeting of stockholders, to serve until
all dividends accumulated have been fully paid for four consecutive quarterly
dividend periods, including the last preceding quarterly dividend period.
Ahmanson Depositary Shares representing each series of Ahmanson Preferred Stock
are listed on the NYSE.
 
  Ahmanson Series C Preferred Stock.
 
   
     As of September 30, 1997, there were issued and outstanding 780,000 shares
of Ahmanson 8.40% Preferred Stock, Series C, liquidation preference $250 per
share (the "Ahmanson Series C Preferred Stock"), represented by 7,800,000
depositary shares, each representing a one-tenth interest in a share of Ahmanson
Series C Preferred Stock. The Ahmanson Series C Preferred Stock is redeemable at
the option of Ahmanson in whole or in part, on and after March 1, 1998 at a
price of $250 per share (equivalent to $25 per depositary share) plus accrued
and unpaid dividends to the redemption date. On January 6, 1998, Ahmanson
announced it would redeem all of the outstanding Ahmanson Series C Preferred
Stock on March 2, 1998.
    
 
     Dividends on the Ahmanson Series C Preferred Stock of $21.00 per share
(8.40% annualized rate) are cumulative and paid quarterly on the first day of
March, June, September and December (equivalent to $2.10 per annum per
depositary share).
 
  Ahmanson Series D Preferred Stock.
 
   
     As of September 30, 1997, there were issued and outstanding 569,000 shares
of 6% Cumulative Convertible Preferred Stock, Series D, liquidation preference
$500 per share (the "Ahmanson Series D Preferred Stock"), evidenced by 5,690,000
depositary shares, each representing a one-tenth interest in a share of Ahmanson
Series D Preferred Stock. The Ahmanson Series D Preferred Stock is redeemable at
the option
    
 
                                       65
<PAGE>   72
 
of Ahmanson, in whole or in part, on and after September 1, 1998 at a price
commencing at $515 per share and declining to $500 per share on September 1,
2003 and thereafter, plus accrued and unpaid dividends to the redemption date.
 
     Dividends on the Ahmanson Series D Preferred Stock of $30 per share (6%
annualized rate) are cumulative and are paid quarterly on the first day of
March, June, September and December (equivalent to $3 per annum per depositary
share).
 
     The Ahmanson Series D Preferred Stock is convertible into Ahmanson Common
Stock, at the option of its holders, at a conversion rate of approximately
20.5465 shares of Ahmanson Common Stock per share of Ahmanson Series D Preferred
Stock (equivalent to a conversion rate of 2.05465 shares of Ahmanson Common
Stock per depositary share) (subject to adjustments upon the occurrence of
certain events).
 
CERTAIN REGULATORY CONSIDERATIONS
 
     The following discussion addresses in general terms the regulatory
framework applicable to savings and loan holding companies and their
subsidiaries, and provides certain information relevant to Ahmanson. Regulation
of financial institutions such as Ahmanson and its subsidiaries is intended
primarily for the protection of depositors, the deposit insurance funds of the
Federal Deposit Insurance Corporation and the banking system as a whole, and
generally is not intended for the protection of stockholders or other investors.
 
  General.
 
     Ahmanson is a savings and loan holding company and, as such, is subject to
the OTS's regulations, examination, supervision and reporting requirements. Home
Savings is a federal savings bank and a member of the Federal Home Loan Bank
System, and its deposits are insured by the Federal Deposit Insurance
Corporation (the "FDIC"). It is subject to examination and supervision by the
OTS and the FDIC and to regulations governing such matters as capital standards,
mergers, establishment and closing of branch offices, subsidiary investments and
activities, and general investment authority.
 
     The descriptions of the statutes and regulations that are applicable to
Ahmanson and the effects thereof that are set forth below and elsewhere in this
document do not purport to be a complete description of such statutes and
regulations and their effects on Ahmanson or to identify every statute and
regulation that may apply to Ahmanson.
 
  Savings and Loan Holding Company Regulations.
 
     Subject to certain limited exceptions, control of a savings association or
a savings and loan holding company may only be obtained with the approval (or in
the case of an acquisition of control by an individual, the absence of
disapproval) of the OTS, after a public comment and application review process.
Any company acquiring control of a savings association becomes a savings and
loan holding company, must register and file periodic reports with the OTS, and
is subject to OTS examination.
 
  Affiliate and Insider Transactions.
 
     Savings associations are subject to affiliate and insider transaction rules
under section 11 of the Home Owner's Loan Act; including those applicable to
member banks of the Federal Reserve System set forth in sections 23A, 23B, 22(g)
and 22(h) of the Federal Reserve Act. These provisions, among other things,
prohibit or limit a savings association from extending credit to, or entering
into certain transactions with, its affiliates (which generally include holding
companies such as Ahmanson and any company under common control with the savings
association) and principal stockholders, directors and executive officers of the
savings association and its affiliates.
 
  Limitations on Acquisitions.
 
     Ahmanson is generally prohibited, either directly or indirectly, from
acquiring control of any savings association or savings and loan holding company
absent prior approval by the OTS and from acquiring more
 
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<PAGE>   73
 
than 5% of any class of voting stock of any savings association or savings and
loan holding company that is not a subsidiary of Ahmanson.
 
  Payment of Dividends.
 
     Ahmanson's principal sources of funds are cash dividends paid to it by Home
Savings and other subsidiaries, investment income and borrowings. There are
restrictions on the ability of Home Savings to pay dividends to Ahmanson.
Savings association subsidiaries of savings and loan holding companies, such as
Home Savings, must notify the OTS of their intent to declare dividends at least
30 days before declaration. The OTS has the authority to preclude those
associates from declaring a dividend.
 
     OTS regulations impose limitations upon certain "capital distributions" by
savings associations, including dividends. The regulations establish a
three-tiered system of regulation, with the greatest flexibility being afforded
to institutions that meet or exceed the fully phased-in capital requirements.
 
     A savings institution that has capital immediately prior to, and on a pro
forma basis after giving effect to, a proposed capital distribution that is at
least equal to its fully phased-in capital requirements is considered a Tier I
institution ("Tier I Institution"). At September 30, 1997, Home Savings was a
Tier I Institution. A Tier I Institution may, without the approval of but with
prior notice to the OTS, make capital distributions during a calendar year up to
the greater of (1) 100% of its net income to date during the calendar year plus
the amount that would reduce the savings institution's "surplus capital ratio"
(the excess over its fully phased-in risk-based capital requirement) to one-half
of its surplus capital ratio at the beginning of the calendar year or (2) 75% of
the institution's net income over the most recent four quarter period. Any
additional capital distributions would require prior regulatory approval. The
OTS retains discretion to subject Tier I Institutions to the more stringent
capital distribution rules applicable to institutions with less capital if the
OTS determines that the institution is in need of more than normal supervision
and has provided the institution with notice to that effect. The OTS also
retains the authority to prohibit any capital distribution otherwise authorized
under the regulations if the OTS determines that the capital distribution would
constitute an unsafe or unsound practice.
 
  Deposit Insurance.
 
     The FDIC administers two separate deposit insurance funds: the Bank
Insurance Fund (the "BIF"), which insures the deposits of institutions the
deposits of which were insured by the FDIC prior to the enactment of FIRREA, and
the Savings Association Insurance Fund (the "SAIF"), which insures the deposits
of institutions the deposits of which were insured by the Federal Savings and
Loan Insurance Corporation. Home Savings is a member of the BIF and currently is
obligated to pay deposit insurance assessments ratably to the SAIF and the BIF
based on 85% and 15% of total deposits, respectively. These percentages are
subject to change in the future based on future events.
 
     The FDIC has established a risk-based system for setting deposit insurance
assessments. Under the risk-based assessment system, an institution's insurance
assessments vary depending upon the level of capital the institution holds and
the degree to which it is the subject of supervisory concern to the FDIC. During
the first three quarters of 1996, the assessment rate for SAIF deposits varied
from 0.23% of covered deposits for well-capitalized institutions that were
deemed to have no more than a few minor weaknesses, to 0.31% of covered deposits
for less than adequately capitalized institutions that posed substantial
supervisory concern. The lowest assessment rate for BIF deposits was $2,000 per
institution per year. The assessment rate for both SAIF and BIF deposits
currently varies from zero to 0.27% of covered deposits. Ahmanson paid $55.1
million in deposit insurance premiums to SAIF in 1996 compared to $79.9 million
in 1995.
 
     Prior to enactment of the Deposit Insurance Funds Act of 1996 ("DIFA"), the
SAIF's three major obligations were to fund losses associated with the failure
of institutions with SAIF-insured deposits; to increase its reserves to 1.25% of
insured deposits over a reasonable period of time; and to make interest payments
on debt incurred through the Financing Corporation to provide funds to the
former Federal Savings and Loan Insurance Corporation ("FICO Debt"). The
reserves of the SAIF were lower than the reserves of the BIF and the BIF did not
have an obligation to pay interest on the FICO Debt. Therefore, premiums
 
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<PAGE>   74
 
assessed on deposits insured by the SAIF were higher than premiums assessed on
deposits insured by the BIF. Such a premium structure provided FDIC-insured
institutions whose deposits were exclusively or primarily BIF-insured (such as
almost all commercial banks) certain competitive advantages over institutions
whose deposits were primarily SAIF-insured (such as Home Savings).
 
     DIFA required FDIC-insured depository institutions with SAIF-insured
deposits to pay a special assessment designed to increase the SAIF's reserves to
the required 1.25% of insured deposits. The amount of the special assessment
imposed on Home Savings was $243.9 million. DIFA also altered the obligation to
make interest payments on the FICO Debt so that assessments to collect the
necessary funds are imposed separately from the deposit insurance premium and
are now assessed on BIF-insured deposits, although at a lower rate, as well as
on SAIF-insured deposits. Because the reserves of both the SAIF and the BIF
equal or exceed the required minimum amount and FICO Debt assessments are
collected separately from deposit insurance assessments, deposit insurance
premiums are currently assessed on SAIF-insured and BIF-insured deposits
according to the same schedule.
 
     The FDIC may initiate a proceeding to terminate an institution's deposit
insurance after a 30-day notice period if, among other things, the institution
is in an unsafe and unsound condition to continue operations. It is the policy
of the FDIC to deem an insured institution to be in an unsafe and unsound
condition if its ratio of Tier I capital to total assets is less than 2%. Tier I
capital is similar to core capital but includes certain investments in and
extensions of credit to subsidiaries engaged in activities not permitted for
national banks. In addition, the FDIC has the power to suspend temporarily a
savings association's insurance on deposits received after the issuance of a
suspension order in the event that the savings association has no tangible
capital.
 
  FICO Debt.
 
     Until December 31, 1999 or, if earlier, the date on which the last savings
association ceases to exist, the rate at which SAIF-insured deposits are
assessed with respect to FICO Debt interest payments will be five times the rate
at which BIF-insured deposits are assessed. Accordingly, institutions whose
deposits are exclusively or primarily BIF-insured (such as almost all commercial
banks) continue to have a competitive advantage over institutions whose deposits
are primarily SAIF-insured (such as Home Savings) although the extent of the
advantage is less than the deposit insurance premium advantage which existed
prior to the enactment of DIFA.
 
  Classification of Assets.
 
     Federal regulations require savings associations to review their assets on
a regular basis and to classify them as "substandard," "doubtful" or "loss" if
warranted. Adequate valuation allowances for loan losses are required for assets
classified as substandard or doubtful. If an asset is classified as loss, the
institution must either establish a specific allowance for loss in the amount
classified as loss or charge off such amount. The institution's OTS District
Director has the authority to approve, disapprove or modify any asset
classification and any amounts established as allowances for loan losses.
 
     At present, certain general allowances may be included within regulatory
capital, while specific allowances may not. If an OTS examiner concludes that
additional assets should be classified or that the valuation allowances
established by the savings association are inadequate, the examiner may
determine, subject to internal review by the OTS, the need for and extent of
additional classification or any increase necessary in the savings association's
general or specific valuation allowances. An insured savings association is also
required to set aside adequate valuation allowances to the extent that an
affiliate possesses assets posing a risk to the institution and to establish
liabilities for off-balance sheet items, such as letters of credit when loss
becomes probable and estimable.
 
  Capital Requirements.
 
     The OTS has adopted capital regulations ("Capital Regulations") for savings
associations which establish three capital requirements -- a core capital
requirement, a tangible capital requirement and a risk-
 
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<PAGE>   75
 
based capital requirement. The capital standards contained in the Capital
Regulations generally must be no less stringent than the capital standards
applicable to national banks. The Capital Regulations require savings
associations to maintain core capital of at least 3% of adjusted total assets,
tangible capital of at least 1.5% of adjusted total assets and total capital
(being the sum of Core Capital and Supplementary Capital) of at least 8% of
risk-weighted assets. In addition, institutions whose exposure to interest-rate
risk is deemed to be above normal will be required to deduct a portion of such
exposure in calculating their risk-based capital. The OTS may establish, on a
case by case basis, individual minimum capital requirements for savings
associations that vary from the requirements that would otherwise apply under
the Capital Regulations. The OTS has not established such individual minimum
capital requirements for Home Savings. Home Savings was in compliance with the
Capital Regulations at September 30, 1997. As of September 30, 1997, Home
Savings' core capital ratio was 5.89%. The Capital Regulations do not apply to
Ahmanson, on a consolidated or non-consolidated basis.
 
     Core capital generally includes common stockholders' equity (including
retained earnings but excluding the net unrealized gain or loss on securities
available for sale), noncumulative perpetual preferred stock and related surplus
and minority interests in the equity accounts of fully consolidated
subsidiaries. Intangible assets (other than a limited amount of mortgage
servicing rights and purchased credit card relationships) must be deducted from
core capital. Certain deferred tax assets also must be deducted.
 
     Tangible capital generally means core capital less any intangible assets
(other than a limited amount of mortgage servicing rights).
 
     Supplementary capital includes, among other things, certain types of
preferred stock and subordinated debt and, subject to certain limits, general
valuation loan and lease loss allowances. A savings association's supplementary
capital may be used to satisfy the risk-based capital requirement only to the
extent of that institution's core capital. Risk-weighted assets are determined
by multiplying each category of an institution's assets, including off balance
sheet equivalents, by a risk weight assigned by the OTS based on the credit risk
associated with those assets, and adding the resulting amounts. The risk weight
categories range from zero percent for cash and government securities to 100%
for assets that do not quality for preferential risk weighting as determined by
the OTS.
 
     The Capital Regulations treat asset sales with recourse as if they did not
occur, and generally require a savings association to maintain capital against
the entire amount of assets sold with recourse, even if recourse is for less
than the full amount. However, when assets are sold with recourse and the amount
of recourse is less than the risk-based capital requirement for such assets, the
assets are not included in risk-weighted assets and capital is required to be
maintained in an amount equal to such recourse amount. A savings association's
retention of the subordinated portion of a senior/subordinated loan
participation or package of loans is treated in the same manner as an asset sale
with recourse.
 
     The Capital Regulations contain special capital rules affecting savings
associations with certain kinds of subsidiaries. For purposes of determining
compliance with each of the capital standards, a savings association's
investments in and extensions of credit to subsidiaries engaged in activities
not permissible for a national bank are deducted from the savings association's
capital, net of reserves against such investment. Home Savings' REI subsidiary
is its only significant subsidiary engaged in activities not permissible for a
national bank. At September 30, 1997, Home Savings' investment in its REI
subsidiary aggregated $41.5 million, of which $38.3 million was required to be
deducted from Home Savings' capital.
 
     Each bank regulatory agency and the OTS is required to review its capital
standards every two years to determine whether those standards require
sufficient capital to facilitate prompt corrective action to prevent or minimize
loss to the deposit insurance funds.
 
  Prompt Corrective Action.
 
     Under OTS regulations which implement the "prompt corrective action" system
established in the Federal Deposit Insurance Act (the "FDIA"), an FDIC-insured
savings association is well capitalized if its ratio of total capital to
risk-weighted assets is 10% or more, its ratio of core capital to risk weighted
assets is 6%
 
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<PAGE>   76
 
or more, its ratio of core capital to total assets is 5% or more and it is not
subject to any written agreement, order or directive to meet a specified capital
level. At September 30, 1997 Home Savings met these standards. An institution
which is not well capitalized is "adequately capitalized" if its ratio of total
capital to risk-weighted assets is at least 8%, its ratio of core capital to
risk-adjusted assets is at least 4% and its ratio of core capital to total
assets is at least 4% (3% if the institution receives the highest rating on the
OTS's CAMEL rating system). Any institution which is not adequately capitalized
is undercapitalized, significantly undercapitalized or critically
undercapitalized, depending upon its capital ratios.
 
     An FDIC-insured savings association that is undercapitalized must submit a
capital restoration plan to the OTS. The plan may be approved only if the OTS
determines it is likely to succeed in restoring the institution's capital and
will not appreciably increase the risks to which the institution is exposed. The
association's performance under the plan must be guaranteed by any company which
controls the association, up to a maximum of 5% of the institution's assets. The
OTS may also require the association to take various actions deemed appropriate
to minimize potential losses to the deposit insurance fund. A significantly
undercapitalized association is subject to additional sanctions and a critically
undercapitalized association generally must be placed in receivership or
conservatorship.
 
  Enforcement and Penalties.
 
     The FDIA contains extensive enforcement provisions applicable to all
FDIC-insured depository institutions, including savings associations and
"institution-affiliated parties," which includes, among others, directors,
officers, employees, agents and controlling stockholders of depository
institutions, including holding companies such as Ahmanson. An institution or
institution-affiliated party may be subject to a three tier penalty regime that
ranges from a maximum penalty of $5,000 per day for a simple violation to a
maximum penalty of $1 million per day for certain knowing violations including
the failure to submit or submission of incomplete, false or misleading reports.
An institution-affiliated party may also be subject to loss of voting rights
with respect to the stock of depository institutions.
 
     Whenever the OTS has reasonable cause to believe that the continuation by a
savings and loan holding company of any activity or of ownership or control of
any subsidiary not insured by the FDIC constitutes a serious risk to the
financial safety, soundness or stability of a subsidiary savings association and
is inconsistent with the sound operation of the savings association, the OTS may
order the holding company to terminate such activities or divest such
non-insured subsidiary. The OTS, without notice or opportunity for hearing, may
also (a) limit the payment of dividends by the savings association, (b) limit
transactions between the savings association and its holding company or other
affiliates and (c) limit any activity of the savings association which creates a
serious risk that the liabilities of the holding company and its affiliates may
be imposed upon the savings association.
 
     FDIA, as amended, requires the OTS to prescribe minimum operational and
managerial standards and standards for asset quality, earnings and stock
valuation for savings associations. Any savings association that fails to meet
the standards may be required to submit a plan for corrective action. If a
savings association fails to submit or implement an acceptable plan, the OTS may
require the association to take any action the OTS determines will best carry
out the purpose of prompt corrective action. The OTS and the bank regulatory
agencies have jointly published a regulation prescribing the required safety and
soundness standards. Home Savings believes that it is in compliance with the
regulation.
 
  Loans and Investments.
 
     Aggregate loans to a single borrower are limited to specified percentages
of a savings association's capital, depending upon the existence and type of any
collateral. Aggregate loans secured by non-residential real property are limited
to a specified percentage of capital.
 
     Savings associations generally may not invest directly in equity
securities, non-investment grade securities or real estate. Indirect investments
in real estate are permitted through subsidiaries subject to limitations based,
generally, on the institution's capital ratios. Investments in subsidiaries, and
the activities conducted through subsidiaries, are subject to regulatory
restrictions.
 
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<PAGE>   77
 
  FHLB System.
 
     The FHLBs provide a central credit facility for member institutions. As a
federal savings bank, Home Savings is required to be a member of the FHLB
System. Members of the FHLB System are required to own capital stock in an FHLB
at least equal to the greater of 1% of the member's outstanding home mortgage
loans and 5% of the member's advances from the FHLB. At September 30, 1997, Home
Savings' investment in FHLB stock was $405.6 million, substantially all of which
can not be withdrawn as long as Home Savings' real estate loan portfolio remains
at its current size.
 
  Federal Reserve System.
 
     Home Savings is subject to various regulations promulgated by the Federal
Reserve Board, including, among others, Regulation B (Equal Credit Opportunity),
Regulation D (Reserves), Regulation E (Electronic Fund Transfers), Regulation Z
(Truth in Lending), Regulation CC (Availability of Funds) and Regulation DD
(Truth in Savings). As holders of loans secured by real property, and as owners
of real property, financial institutions, including Home Savings, may be subject
to potential liability under various statutes and regulations applicable to
property owners generally, including statutes and regulations relating to the
environmental condition of the property.
 
  Liquidity.
 
     OTS regulations require a savings association to maintain, for each
calendar month, an average daily balance of liquid assets equal to at least 4%
of the average daily balance of its net withdrawable accounts plus short-term
borrowings during the preceding calendar month. The OTS may vary the required
percentage within a range of 4% to 10% and may also vary the definition of
liquid assets. Monetary penalties may be imposed for failure to meet liquidity
ratio requirements.
 
  Community Reinvestment Act.
 
     The CRA requires each savings association, as well as other depository
institutions, to identify the communities served by the institution's offices
and to identify the types of credit the institution is prepared to extend within
such communities. The CRA also requires the OTS to assess the performance of the
institution in meeting the credit needs of its community and to take such
assessments into consideration in reviewing applications for mergers,
acquisitions and other transactions. In connection with its assessment of a
savings association's CRA performance, the OTS will assign a rating of
"outstanding," "satisfactory," "needs to improve" or "substantial
noncompliance." Based on an examination conducted as of September 5, 1995, Home
Savings was rated "outstanding."
 
  Qualified Thrift Lender.
 
     A savings association must invest at least 65% of its portfolio assets in
"qualified thrift investments" (each as defined by statute and OTS regulations)
on a monthly average basis in nine out of every 12 months on a rolling 12-month
"look back" basis. Home Savings was in compliance with this requirement as of
September 30, 1997 and would be in compliance on a pro forma basis after giving
effect to the Merger.
 
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<PAGE>   78
 
      CERTAIN DIFFERENCES IN THE RIGHTS OF AHMANSON STOCKHOLDERS AND COAST
                                  STOCKHOLDERS
 
     As a consequence of the Merger and the transactions contemplated thereby,
stockholders of Coast would become stockholders of Ahmanson. The following is a
summary of certain similarities and all material differences between the rights
of holders of shares of Coast Common Stock and the rights of holders of Ahmanson
Common Stock. Because each of Coast and Ahmanson is organized under the laws of
Delaware, these differences arise solely from various provisions of the
certificate of incorporation and by-laws of each of Coast and Ahmanson, as well
as from the Ahmanson Rights Agreement, dated as of November 7, 1997, between
Ahmanson and First Chicago Trust Company of New York, as rights agent (the
"Ahmanson Rights Plan") and the Coast Rights Agreement, dated as of August 25,
1989, between Coast and Manufacturers Hanover Trust of California, as rights
agent (the "Coast Rights Plan").
 
     The following summary does not purport to be a complete statement of the
rights of stockholders under the Coast Charter, the Coast By-laws and the Coast
Rights Plan as compared with the rights of Ahmanson's stockholders under the
Ahmanson Charter, the by-laws of Ahmanson (the "Ahmanson By-Laws") and the
Ahmanson Rights Plan, or a complete description of the specific provisions
referred to herein. The summary is qualified in its entirety by reference to the
governing corporate instruments, including the aforementioned instruments, of
Coast and Ahmanson, copies of which have been filed as exhibits hereto or to
documents incorporated herein by reference.
 
MEETINGS OF STOCKHOLDERS
 
     Under Delaware law, special meetings of the stockholders may be called by
the board of directors or such other persons as may be authorized by the
certificate of incorporation or by-laws. The Coast Charter and By-Laws do not
authorize any other person to call a special meeting. The Ahmanson Charter and
By-Laws provide that a special meeting may also be called by a committee of the
Ahmanson Board which has been designated by the Ahmanson Board and authorized to
call a special meeting by a resolution of the Ahmanson Board or by the Ahmanson
By-Laws.
 
NUMBER AND ELECTION OF DIRECTORS
 
     Number of Directors. Under Delaware law, the number of directors shall be
fixed by or in the manner provided in the by-laws, unless the certificate of
incorporation fixes the number of directors, in which case a change in the
number of directors shall be made only by amendment to the certificate. The
Coast Charter and By-laws provide that the number of directors shall be
determined by a resolution of the majority of the Coast Board. The Ahmanson
By-Laws provide that the number of directors shall be determined by a resolution
of the majority of the Ahmanson Board or a majority of the voting power of the
outstanding shares of voting stock.
 
     Advance Notice of Stockholder Nominations of Directors. Under the Coast
By-laws, nominations of persons for election to the Coast Board may be made at a
meeting of stockholders by any stockholder, provided that the Secretary of Coast
receives written notice not less than 30 days prior to the annual meeting.
 
     Under the Ahmanson By-Laws, nominations of persons for election to the
Ahmanson Board may be made at a meeting of stockholders by any stockholder,
provided that the Secretary of Ahmanson receives written notice not less than 60
days nor more than 120 days prior to the meeting. If less than 65 days' notice
or prior public disclosure of the date of the meeting is given or made by
Ahmanson to stockholders, the notice of a nomination must be received not later
than the close of business on the tenth day following the day on which such
notice of the date of the annual meeting was mailed or public disclosure was
made. Stockholder notices must state, among other things, a brief description of
the business desired to be brought before the annual meeting and the reasons for
conducting such business at the annual meeting, the name and record address of
the stockholder proposing the business, the class and number of shares of
Ahmanson stock beneficially owned by the stockholder, any material interest in
such business and any other information relating to the stockholder or the
proposal required to be disclosed in solicitations for proxies for the election
of directors pursuant to Regulation 14A under the Exchange Act.
 
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<PAGE>   79
 
     Classification of Board of Directors. Delaware law permits (but does not
require) a certificate of incorporation to provide that a board of directors be
divided into classes, with each class having a term of office longer than one
year but not longer than three years. The Coast Charter provides that the Coast
Board shall have three classes. The directors of each class shall serve for a
term ending at the third annual meeting following the annual meeting at which
they were elected. The Ahmanson Charter does not provide for a classified board.
Accordingly, all members of the Ahmanson Board are elected at each annual
meeting.
 
INDEMNIFICATION
 
     The Coast Charter generally provides for the indemnification of persons
serving as a director or officer of Coast or at the request of Coast as a
director or officer of another corporation, partnership, joint venture, trust or
other enterprise against all costs and expenses reasonably incurred by such
person or on such person's behalf in connection with such action, suit or
proceeding and any appeal therefrom, if such person acted in good faith and in a
manner such person reasonably believed to be in the best interests of the
corporation and with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. The Ahmanson Charter and
By-Laws generally provide for the indemnification of persons serving as a
director, officer, employee or agent of Ahmanson or at the request of Ahmanson
as a director, officer, employee or agent of another corporation or of a
partnership, joint venture, trust or other enterprise, to the fullest extent
authorized by the DGCL. The Ahmanson By-Laws provide that such right to
indemnification may only be extended to employees and agents in a specific case
by action of the Ahmanson Board.
 
CERTAIN VOTING RIGHTS
 
     With Respect to Proposed Mergers. Under Delaware law, certain mergers and
consolidations or the sale of all or substantially all of the assets of a
corporation requires the approval of the holders of a majority (unless the
certificate of incorporation requires a higher percentage) of the outstanding
shares of such corporation entitled to vote thereon. Neither the Coast Charter
nor the Ahmanson Charter requires a higher percentage generally, except under
certain situations involving substantial stockholders discussed below.
 
     With Respect to Transactions with Substantial Stockholders. The Coast
Charter provides that certain transactions between Coast and a substantial
stockholder (generally a person holding more than 10% of the outstanding voting
stock of Coast) require the approval of the holders of two-thirds of all
outstanding shares of capital stock of Coast entitled to vote generally in the
election of directors, including (i) the merger or consolidation of Coast or any
subsidiary of Coast; (ii) the sale, lease or other disposition of any assets of
Coast having an aggregate fair market value of $20 million or more; (iii) the
issuance or transfer by Coast or any subsidiary of Coast of securities of Coast
or a subsidiary of Coast having an aggregate fair market value of $20 million or
more; (iv) the adoption of a plan or proposal for the liquidation of dissolution
of any subsidiary of Coast; (v) the reclassification of securities,
recapitalization, consolidation or any other transaction that has the direct or
indirect effect of increasing the voting power of any such substantial
stockholder in any class or series of capital stock of Coast or any subsidiary
of Coast; or (vi) any agreement, contract or other arrangement providing
directly or indirectly for any of the foregoing; except, in each case, for any
transaction approved by a vote of a majority of directors unaffiliated with the
Substantial Stockholder and its affiliates, or any transaction to be consummated
within three years after the Substantial Stockholder becomes a Substantial
Stockholder and if certain conditions are met.
 
     The Ahmanson Charter provides that certain transactions between Ahmanson
and a substantial stockholder (generally a person or group holding capital stock
representing 10% or more of the outstanding voting power of Ahmanson) require
the approval of the holders of 80% of the capital stock of Ahmanson entitled to
vote for the election of directors, including (i) the repurchase by Ahmanson of
capital stock representing 10% or more of the total voting power of Ahmanson
from such a substantial stockholder under certain circumstances, (ii) certain
mergers, consolidations, combinations or reorganizations of Ahmanson or the sale
of all or a substantial part of the assets of Ahmanson or its subsidiaries where
such a substantial stockholder or its affiliates are parties to the transaction
and (iii) certain other exchanges of securities, cash or other properties or
assets of Ahmanson involving such a substantial stockholder or its affiliates,
except, in the
 
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<PAGE>   80
 
case of (ii) or (iii), for any transaction which has been approved by the
Ahmanson Board, including by the vote of at least two-thirds of the directors
unaffiliated with the substantial stockholder and its affiliates.
 
     Cumulative Voting. Under Delaware law, stockholders of a corporation are
not entitled to cumulate their votes in the election of directors unless the
corporation's certificate of incorporation so provides. Neither the Coast
Charter nor the Ahmanson Charter provides for cumulative voting.
 
REMOVAL OF DIRECTORS; FILLING VACANCIES ON THE BOARD OF DIRECTORS
 
     Under Delaware law, any or all directors of a corporation which does not
have cumulative voting or a classified board may be removed, with or without
cause, by the holders of a majority of the shares entitled to vote at an
election of directors, unless such corporation's certificate of incorporation
provides otherwise. Coast has a classified board and the Coast Charter provides
that directors may be removed only for cause, which is defined in the Coast
Charter to mean conviction for a felony or a non-appealable adjudication against
the director for gross negligence or misconduct. The Ahmanson Charter does not
limit the right of stockholders to remove directors with or without cause.
 
     Under Delaware law, unless otherwise provided in the corporation's
certificate of incorporation or by-laws, vacancies and newly-created
directorships resulting from any increase in the authorized number of directors
may be filled by a majority of the directors in office. The Coast Charter
provides that any vacancy, whether arising through death, resignation,
retirement, disqualification, removal or other cause, may be filled only by a
majority vote of the remaining directors or by the sole remaining director if
only one such director remains or by the stockholders if the directors or
director fail to so act. Neither the Ahmanson Charter nor the Ahmanson By-Laws
provides for vacancies or newly-created directorships to be filled by
stockholder vote.
 
STOCKHOLDER ACTION BY WRITTEN CONSENT
 
     Under Delaware law, unless otherwise provided in the certificate of
incorporation, any action which may be taken at any annual or special meeting
may be taken without a meeting and without prior notice if a consent in writing,
setting forth the action so taken, shall be signed by the holders of outstanding
shares having not less than the minimum number of votes that would be necessary
to authorize or take such action at a meeting at which all shares entitled to
vote thereon were present and voted. The Coast Charter and By-laws provide that
any action by written stockholder consent must be signed by all the stockholders
of Coast entitled to vote. The Ahmanson Charter prohibits any action by written
stockholder consent.
 
AMENDMENT OF BY-LAWS
 
     Under Delaware law, the power to adopt, amend or repeal by-laws is vested
in the stockholders unless the certificate of incorporation confers the power to
adopt, amend or repeal by-laws upon the directors as well. Both the Coast
Charter and the Ahmanson Charter grant such power to their respective boards of
directors. The Coast By-laws provide that the Coast By-laws may not be amended
or repealed by the stockholders without the approval of the holders of
two-thirds of the voting stock of Coast.
 
RIGHTS PLANS
 
     Ahmanson Rights Plan. On November 7, 1997, the Ahmanson Board declared a
dividend distribution of one preferred stock purchase right (a "Right"), to
holders of Ahmanson Common Stock outstanding on November 17, 1997.
 
   
     In the event that any person or affiliated group becomes the beneficial
owner of 15% or more of the outstanding shares of Ahmanson Common Stock, each
holder of a Right (other than Rights beneficially owned by the 15% beneficial
owner) will thereafter have the right to purchase from Ahmanson that number of
shares of Ahmanson Common Stock having a market value equal to two times the
exercise price of the Right. If Ahmanson thereafter is acquired in a merger or
other business combination transaction or 50% or more of its consolidated assets
or earning power are sold, proper provision will be made so that each holder of
a Right, will thereafter have the right to receive, upon the exercise thereof at
the then current exercise price of the
    
 
                                       74
<PAGE>   81
 
   
Right (currently, $240), that number of shares of common stock of the acquiring
company which at the time of such transaction will have a market value of two
times the exercise price of the Right.
    
 
     Coast Rights Plan. On August 23, 1989, the Coast Board declared a dividend
distribution of one Coast Right for each share of Coast Common Stock outstanding
on September 6, 1989.
 
     In the event that any person becomes the beneficial owner of 15% or more of
the outstanding shares of Coast Common Stock, proper provision is required to be
made so that each holder of a Coast Right, other than Coast Rights beneficially
owned by the acquiring person, will thereafter have the right to receive upon
exercise that number of shares of Coast Common Stock having a market value equal
to two times the exercise price of the Coast Right. In the event that, at any
time following such acquisition of 15% or more of the outstanding shares, Coast
is acquired in a merger or other business combination transaction or 50% or more
of its consolidated assets or earning power are sold (with certain exceptions),
proper provision will be made so that each holder of a Coast Right will
thereafter have the right to receive, upon the exercise thereof at the then
current exercise price of the Coast Right, that number of shares of common stock
of the acquiring company which at the time of such transaction will have a
market value equal to two times the exercise price of the Coast Right. At the
Effective Time, the Coast Rights, which currently trade with, and are
represented by the certificates for, Coast Common Stock, will be canceled and no
additional consideration will be payable with respect thereto.
 
                                       75
<PAGE>   82
 
                    COMPARATIVE MARKET PRICES AND DIVIDENDS
AHMANSON
 
     Ahmanson Common Stock is traded on the NYSE under the symbol "AHM" and is
also listed on the Pacific Exchange. The following table sets forth, for the
indicated periods, the high and low closing sale prices for Ahmanson Common
Stock as reported on the NYSE Composite Tape, together with the per share
dividends declared by Ahmanson, during the indicated periods.
 
   
<TABLE>
<CAPTION>
                                                     PRICE RANGE
                                                    --------------           CASH DIVIDENDS
QUARTER                                              HIGH        LOW       DECLARED PER SHARE
- -------                                             -------    -------     ------------------
<S>    <C>                                          <C>        <C>         <C>
1996:
       First......................................  $26 3/4    $21 1/4           .22
       Second.....................................   27 5/8     22 1/4           .22
       Third......................................   28 3/8     23 3/8           .22
       Fourth.....................................   34 1/2     27 7/8           .22
1997:
       First......................................  $45 1/4    $32               .22
       Second.....................................   47 3/8     34 3/4           .22
       Third......................................   58 1/16    43 5/8           .22
       Fourth.....................................   68         54 3/16          .22
1998:
       First (through January 12, 1998)...........
</TABLE>
    
 
   
     On October 3, 1997, the last trading day before public announcement of the
Merger, the closing price per share of Ahmanson Common Stock on the NYSE was
$57 1/8 (as reported on the NYSE Composite Tape). On January 12, 1998, the last
practicable date prior to the mailing of this Proxy Statement/Prospectus, the
closing price per share of Ahmanson Common Stock was           (as reported on
the NYSE Composite Tape). Past price performance is not necessarily indicative
of future price performance. Holders of Coast Common Stock are urged to obtain
current market quotations for shares of Ahmanson Common Stock.
    
 
     The holders of Ahmanson Common Stock are entitled to receive dividends when
and if declared by the Ahmanson Board out of funds legally available therefor.
Although Ahmanson currently intends to continue paying quarterly cash dividends
on the Ahmanson Common Stock, there can be no assurance that Ahmanson's dividend
policy will remain unchanged after completion of the Merger. The declaration and
payment of dividends thereafter will depend upon business conditions, operating
results, capital and reserve requirements, and the Ahmanson Board's
consideration of other relevant factors.
 
                                       76
<PAGE>   83
 
COAST
 
     Coast Common Stock is traded on the NYSE under the symbol "CSA" and is also
listed on the Pacific Exchange. The following table sets forth, for the
indicated periods, the high and low closing sale prices for Coast Common Stock
as reported on the NYSE Composite Tape. Coast did not pay any dividends on the
Coast Common Stock for the periods indicated.
 
   
<TABLE>
<CAPTION>
                                                                            PRICE RANGE
                                                                      ---------------------
            QUARTER                                                     HIGH         LOW
            -------                                                   --------     --------
            <S>                                                      <C>           <C>
            1996:
              First................................................   33 3/4        26 1/2
              Second...............................................   34            29 1/2
              Third................................................   35 1/8        29 1/4
              Fourth...............................................   37 3/8        31 3/8
            1997:
              First................................................   48 3/4        35 7/8
              Second...............................................   46            38 7/8
              Third................................................   52 3/4        44 7/16
              Fourth...............................................   68 15/16      52 7/16 
            1998:
              First (through January 12, 1998).....................
</TABLE>
    
 
   
     On October 3, 1997, the last trading day before public announcement of the
Merger, the closing price per share of Coast Common Stock on the NYSE was $54
(as reported on the NYSE Composite Tape). On January 12, 1998, the last
practicable date prior to the mailing of this Proxy Statement/Prospectus, the
closing price per share of Coast Common Stock was             (as reported on
the NYSE Composite Tape). Past price performance is not necessarily indicative
of likely future price performance. Holders of Coast Common Stock are urged to
obtain current market quotations for shares of Coast Common Stock.
     
                                       77
<PAGE>   84
 
             VOTING SECURITIES AND PRINCIPAL STOCKHOLDERS OF COAST
 
PRINCIPAL BENEFICIAL OWNERS
 
     The following table lists the only stockholder known by Coast to be the
beneficial owner of more than five percent of outstanding Coast Common Stock.
 
<TABLE>
<CAPTION>
                  NAME AND ADDRESS OF                  AMOUNT AND NATURE OF         PERCENT OF
                  BENEFICIAL OWNER(1)                 BENEFICIAL OWNERSHIP(1)     COMMON STOCK(1)
    ------------------------------------------------  -----------------------     ---------------
    <S>                                               <C>                         <C>
    Jenswold, King and Associates, Inc..............     1,041,166.00                   5.46%
      Two Post Oak Central
      1980 Post Oak Boulevard, Suite 2400
      Houston, Texas 77056-3898
</TABLE>
 
- ---------------
 
(1) Information based on Schedule 13G filed by Jenswold, King and Associates,
    Inc. on March 5, 1997.
 
SHARES BENEFICIALLY OWNED BY DIRECTORS AND EXECUTIVE OFFICERS
 
     Following is a table which indicates as of September 30, 1997 the amount
and the percent of beneficial ownership of Coast Common Stock for each director,
the Chief Executive Officer and the four other most highly compensated executive
officers, and all directors and executive officers as a group. Unless otherwise
noted, each individual has sole voting and sole investment power with respect to
the number of shares set forth opposite his name.
 
<TABLE>
<CAPTION>
                          NAME OF BENEFICIAL OWNER                  NUMBER OF SHARES
                      OR NUMBER OF PERSONS IN GROUP(1)             BENEFICIALLY OWNED
            -----------------------------------------------------  ------------------
            <S>                                                    <C>
            Leon S. Angvire......................................          25,547(2)
            John C. Argue........................................           9,000(2)
            James F. Barritt.....................................         133,985
            Gerald D. Barrone....................................          86,301
            James R. Boyle.......................................          75,000
            Joan Milke Flores....................................           6,834(2)
            Robert L. Hunt II....................................         252,003
            Jack P. Libby........................................           7,000(2)
            Ray Martin...........................................         319,956
            Thomas V. McKernan, Jr...............................           6,500(2)
            James P. Miscoll.....................................          15,000(2)
            Norman H. Raiden.....................................         111,772
            Keith W. Renken......................................           8,500(2)
            Harold B. Starkey, Jr................................          10,600(2)
            All directors and executive officers as a group(16
              persons)...........................................       1,142,349
</TABLE>
 
- ---------------
 
(1) Each of the named persons owns less than 1% of the outstanding shares of
    Common Stock except for Mr. Martin who owns 1.69% and Mr. Hunt who owns
    1.34%. All directors and executive officers as a group own 5.83% of the
    outstanding shares of Common Stock. The foregoing percentages and the share
    amounts shown in the table include with respect to Messrs. Barritt, Barrone,
    Boyle, Hunt, Martin, Raiden and all directors and executive officers as a
    group (including those named) 132,185 shares, 79,301 shares, 70,000 shares,
    208,211 shares, 295,441 shares, 105,772 shares and 1,004,661 shares,
    respectively, that are subject to options which are exercisable.
 
(2) Includes 5,000 exercisable options.
 
                                       78
<PAGE>   85
 

                                    EXPERTS

 

     The consolidated financial statements of Ahmanson as of December 31, 1996
and 1995, and for each of the years in the three-year period ended December 31,
1996, have been incorporated by reference herein in reliance upon the report of
KPMG Peat Marwick LLP, independent certified public accountants, incorporated by
reference herein, and upon the authority of said firm as experts in accounting
and auditing.

 
     The consolidated financial statements of Coast as of December 31, 1996 and
1995, and for each of the years in the three-year period ended December 31,
1996, have been incorporated by reference herein in reliance upon the report of
KPMG Peat Marwick LLP, independent certified public accountants, incorporated by
reference herein, and upon the authority of said firm as experts in accounting
and auditing.
 
                       VALIDITY OF AHMANSON COMMON STOCK
 
     The validity of the shares of Ahmanson Common Stock being offered hereby
will be passed upon for Ahmanson by Sullivan & Cromwell, Los Angeles.
 
                                       79
<PAGE>   86
 
                                                                      APPENDIX A
 
================================================================================
 
                              AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER
                          DATED AS OF OCTOBER 5, 1997
                                 BY AND BETWEEN
                            H. F. AHMANSON & COMPANY
                                      AND
                         COAST SAVINGS FINANCIAL, INC.
 
================================================================================
<PAGE>   87
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         -----
<S>     <C>                                                                              <C>
 
                                          ARTICLE I
                                     CERTAIN DEFINITIONS
1.01    Certain Definitions............................................................    A-1
 
                                          ARTICLE II
 
                                          THE MERGER
2.01    The Merger.....................................................................    A-5
2.02    Effective Date and Effective Time..............................................    A-5
 
                                         ARTICLE III
                              CONSIDERATION; EXCHANGE PROCEDURES
3.01    Merger Consideration...........................................................    A-5
3.02    Rights as Stockholders; Stock Transfers........................................    A-6
3.03    Fractional Shares..............................................................    A-6
3.04    Exchange Procedures............................................................    A-6
3.05    Anti-Dilution Provisions.......................................................    A-7
3.06    Options, Performance Shares and Stock Appreciation Rights......................    A-7
3.07    Dissenters Rights..............................................................    A-8
 
                                          ARTICLE IV
 
                                 ACTIONS PENDING ACQUISITION
4.01    Forebearances of Coast.........................................................    A-8
4.02    Forebearances of Ahmanson......................................................   A-10
                                          ARTICLE V
 
                                REPRESENTATIONS AND WARRANTIES
5.01    Disclosure Schedules...........................................................   A-10
5.02    Standard.......................................................................   A-10
5.03    Representations and Warranties of Coast........................................   A-10
5.04    Representations and Warranties of Ahmanson.....................................   A-18
 
                                          ARTICLE VI
 
                                          COVENANTS
6.01    Reasonable Best Efforts........................................................   A-20
6.02    Stockholder Approval...........................................................   A-20
6.03    Registration Statements........................................................   A-21
6.04    Press Releases.................................................................   A-22
6.05    Access; Information............................................................   A-22
6.06    Acquisition Proposals..........................................................   A-23
6.07    Affiliate Agreements...........................................................   A-23
6.08    Takeover Laws..................................................................   A-23
6.09    Certain Policies...............................................................   A-23
6.10    NYSE Listing...................................................................   A-23
6.11    Regulatory Applications........................................................   A-23
6.12    Indemnification................................................................   A-24
6.13    Benefit Plan; Retention Bonuses................................................   A-25
</TABLE>
    
 
                                       -i-
<PAGE>   88
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
<S>     <C>                                                                              <C>
6.14    Accountants' Letters...........................................................   A-25
6.15    Notification of Certain Matters................................................   A-25
6.16    Officers and Directors.........................................................   A-25
6.17    CPR Trust......................................................................   A-25
 
                                         ARTICLE VII
 
                           CONDITIONS TO CONSUMMATION OF THE MERGER
7.01    Conditions to Each Party's Obligation to Effect the Merger.....................   A-26
7.02    Conditions to Obligation of Coast..............................................   A-26
7.03    Conditions to Obligation of Ahmanson...........................................   A-27
 
                                         ARTICLE VIII
 
                                         TERMINATION
8.01    Termination....................................................................   A-28
8.02    Effect of Termination and Abandonment..........................................   A-28
 
                                          ARTICLE IX
 
                                        MISCELLANEOUS
9.01    Survival.......................................................................   A-29
9.02    Waiver; Amendment..............................................................   A-29
9.03    Counterparts...................................................................   A-29
9.04    Governing Law..................................................................   A-29
9.05    Expenses.......................................................................   A-29
9.06    Notices........................................................................   A-29
9.07    Entire Understanding; No Third Party Beneficiaries.............................   A-30
9.08    Interpretation; Effect.........................................................   A-30
</TABLE>
 
EXHIBIT A Form of Coast Affiliate Agreement
 
                                      -ii-
<PAGE>   89
 
     AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER, dated as of October 5,
1997 (this "Agreement"), by and between Coast Savings Financial, Inc. ("Coast")
and H. F. Ahmanson & Company ("Ahmanson").
 
                                    RECITALS
 
     A. Coast Savings Financial, Inc. Coast is a Delaware corporation, having
its principal place of business in Los Angeles, California.
 
     B. H. F. Ahmanson & Company. Ahmanson is a Delaware corporation, having its
principal place of business in Irwindale, California.
 
     C. Intentions of the Parties. It is the intention of the parties to this
Agreement that the business combination contemplated hereby be treated as a
"reorganization" under Section 368 of the Internal Revenue Code of 1986, as
amended (the "Code").
 
     D. Board Action. The respective Boards of Directors of each of Ahmanson and
Coast have determined that it is in the best interests of their respective
companies and their stockholders to consummate the strategic business
combination transaction provided for herein.
 
     NOW, THEREFORE, in consideration of the premises and of the mutual
covenants, representations, warranties and agreements contained herein the
parties agree as follows:
 
                                   ARTICLE I
 
                              CERTAIN DEFINITIONS
 
     1.01  Certain Definitions. The following terms are used in this Agreement
with the meanings set forth below:
 
          "Acquisition Proposal" means any tender or exchange offer, proposal
     for a merger, consolidation or other business combination involving Coast
     or any of its Subsidiaries or any proposal or offer to acquire in any
     manner a substantial equity interest in, or a substantial portion of the
     assets or deposits of, Coast or any of its Subsidiaries, other than the
     transactions contemplated by this Agreement.
 
          "Agreement" means this Agreement, as amended or modified from time to
     time in accordance with Section 9.02.
 
          "Ahmanson" has the meaning set forth in the preamble to this
     Agreement.
 
          "Ahmanson Board" means the Board of Directors of Ahmanson.
 
          "Ahmanson Common Stock" means the common stock, par value $.01 per
     share, of Ahmanson.
 
          "Ahmanson Preferred Stock" means the preferred stock, par value $.01
     per share, of Ahmanson, including its outstanding shares of 8.40% Series C
     preferred stock and 6% Cumulative Convertible Series D preferred stock.
 
          "Ahmanson Registration Statement" has the meaning set forth in Section
     6.03.
 
          "Ahmanson Rights" means the preferred share purchase rights issued
     under the Ahmanson Rights Agreement.
 
          "Ahmanson Rights Agreement" means the Rights Agreement, dated as of
     July 26, 1988, between Ahmanson and Union Bank, as rights agent.
 
          "Ahmanson Stock" means, collectively, Ahmanson Common Stock and
     Ahmanson Preferred Stock.
 
          "Coast" has the meaning set forth in the preamble to this Agreement.
 
          "Coast Affiliate" has the meaning set forth in Section 6.07(a).
 
                                       A-1
<PAGE>   90
 
          "Coast Board" means the Board of Directors of Coast.
 
          "Coast By-Laws" means the By-laws of Coast.
 
          "Coast Certificate" means the Certificate of Incorporation of Coast.
 
          "Coast Common Stock" means the common stock, par value $.01 per share,
     of Coast.
 
          "Coast Federal" means Coast Federal Bank, Federal Savings Bank.
 
          "Coast Meeting" has the meaning set forth in Section 6.02.
 
          "Coast Performance Share Award Plan" means the Coast Performance Share
     Plan for Key Employees.
 
          "Coast Preferred Stock" means the serial preferred stock, no par value
     per share, of Coast.
 
          "Coast Rights" means the preferred share purchase rights issued under
     the Coast Rights Agreement.
 
          "Coast Rights Agreement" means the Rights Agreement, dated as of
     August 25, 1989, between Coast and Manufacturers Hanover Trust of
     California, as rights agent.
 
          "Coast Stock" means, collectively, Coast Common Stock and Coast
     Preferred Stock.
 
          "Coast Stock Option" has the meaning set forth in Section 3.06.
 
          "Coast Stock Plans" means the 1996 Equity Incentive Plan and the 1985
     Stock Option and Stock Appreciation Rights Plan.
 
          "Code" has the meaning set forth in the recitals.
 
          "Commitment" has the meaning set forth in Annex I hereto.
 
          "Compensation and Benefit Plans" has the meaning set forth in Section
     5.03(m).
 
          "Consultants" has the meaning set forth in Section 5.03(m).
 
          "Costs" has the meaning set forth in Section 6.12(a).
 
          "CPR Certificates" has the meaning set forth in Annex I hereto.
 
          "CPR Prospectus" has the meaning set forth in Section 6.03.
 
          "CPR Trust" means the trust formed for the purpose of issuing the CPR
     Certificates.
 
          "CPR Trust Registration Statement" has the meaning set forth in
     Section 6.03.
 
          "Delaware Secretary" has the meaning set forth in Section 2.01.
 
          "DGCL" means the Delaware General Corporation Law.
 
          "Directors" has the meaning set forth in Section 5.03(m).
 
          "Disclosure Schedule" has the meaning set forth in Section 5.01.
 
          "Dissenters' Shares" has the meaning set forth in Section 3.01(a).
 
          "Dissenting Shareholders" has the meaning set forth in Section
     3.01(a).
 
          "Effective Date" means the date on which the Effective Time occurs.
 
          "Effective Time" means the effective time of the Merger, as provided
     for in Section 2.02.
 
          "Employees" has the meaning set forth in Section 5.03(m).
 
          "Environmental Laws" means all applicable local, state and federal
     environmental, health and safety laws and regulations, including, without
     limitation, the Resource Conservation and Recovery Act, the Comprehensive
     Environmental Response, Compensation, and Liability Act, the Clean Water
     Act, the
 
                                       A-2
<PAGE>   91
 
     Federal Clean Air Act, and the Occupational Safety and Health Act, each as
     amended, regulations promulgated thereunder, and state counterparts.
 
          "ERISA" means the Employee Retirement Income Security Act of 1974, as
     amended.
 
          "ERISA Affiliate" has the meaning set forth in Section 5.03(m).
 
          "ERISA Affiliate Plan" has the meaning set forth in Section 5.03(m).
 
          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
     and the rules and regulations thereunder.
 
          "Exchange Agent" has the meaning set forth in Section 3.04.
 
          "Exchange Ratio" has the meaning set forth in Section 3.01.
 
          "Expense Fund" has the meaning set forth in Annex I hereto.
 
          "FDIC" means the Federal Deposit Insurance Corporation.
 
          "FHLBSF" means the Federal Home Loan Bank of San Francisco.
 
          "Governmental Authority" means any court, administrative agency or
     commission or other federal, state or local governmental authority or
     instrumentality.
 
          "HOLA" means the Home Owners' Loan Act, as amended.
 
          "Home Savings" means Home Savings of America, FSB.
 
          "Indemnified Party" has the meaning set forth in Section 6.12(a).
 
          "Insurance Amount" has the meaning set forth in Section 6.12(b).
 
          "Insurance Policies" has the meaning set forth in Section 5.03(t).
 
          "IRS" has the meaning set forth in Section 5.03(m).
 
          "Liens" means any charge, mortgage, pledge, security interest,
     restriction, claim, lien, or encumbrance.
 
          "Litigation Trustees" has the meaning set forth in Annex I hereto.
 
          "Material Adverse Effect" means, with respect to Ahmanson or Coast,
     any effect that (i) is material and adverse to the financial position,
     results of operations or business of Ahmanson and its Subsidiaries taken as
     a whole or Coast and its Subsidiaries taken as a whole, respectively, or
     (ii) would materially impair the ability of either Ahmanson or Coast to
     perform its obligations under this Agreement or otherwise materially impede
     the consummation of the Merger and the other transactions contemplated by
     this Agreement, provided that Material Adverse Effect shall not be deemed
     to include a change in condition resulting from a general downturn in the
     California economy.
 
          "Merger" has the meaning set forth in Section 2.01.
 
          "Merger Consideration" has the meaning set forth in Section 3.01.
 
          "Multiemployer Plans" has the meaning set forth in Section 5.03(m).
 
          "New Certificate" has the meaning set forth in Section 3.04.
 
          "NYSE" means the New York Stock Exchange, Inc.
 
          "Old Certificate" has the meaning set forth in Section 3.04.
 
          "OTS" means the Office of Thrift Supervision.
 
          "PBGC" means the Pension Benefit Guaranty Corporation.
 
          "Pension Plan" has the meaning set forth in Section 5.03(m).
 
                                       A-3
<PAGE>   92
 
          "Person" means any individual, savings association, bank, corporation,
     limited liability company, partnership, association, joint-stock company,
     business trust or unincorporated organization.
 
          "Previously Disclosed" by a party means information set forth in its
     Disclosure Schedule.
 
          "Proxy Statement" has the meaning set forth in Section 6.03.
 
          "Registration Statements" has the meaning set forth in Section 6.03.
 
          "Regulatory Authorities" has the meaning set forth in Section 5.03(i).
 
          "Regulatory Documents" means documents filed with the SEC or the OTS,
     as applicable, of the types referred to in Section 5.03(g) and Section
     5.04(g).
 
          "Replacement Option" has the meaning set forth in Section 3.06.
 
          "Representatives" means, with respect to any Person, such Person's
     directors, officers, employees, legal or financial advisors or any
     representatives of such legal or financial advisors.
 
          "Rights" means, with respect to any Person, securities or obligations
     convertible into or exercisable or exchangeable for, or giving any person
     any right to subscribe for or acquire, or any options, calls or commitments
     relating to, or any stock appreciation right or other instrument the value
     of which is determined in whole or in part by reference to the market price
     or value of, shares of capital stock of such person.
 
          "SAIF" means the Savings Association Insurance Fund of the Federal
     Deposit Insurance Corporation. "SEC" means the Securities and Exchange
     Commission.
 
          "Securities Act" means the Securities Act of 1933, as amended, and the
     rules and regulations thereunder.
 
          "Subsidiary" and "Significant Subsidiary" have the meanings ascribed
     to them in Rule 1-02 of Regulation S-X of the SEC.
 
          "Surviving Corporation" has the meaning set forth in Section 2.01.
 
          "Takeover Laws" has the meaning set forth in Section 5.03(o).
 
          "Tax" and "Taxes" means all federal, state, local or foreign taxes,
     charges, fees, levies or other assessments, however denominated, including,
     without limitation, all net income, gross income, gains, gross receipts,
     sales, use, ad valorem, goods and services, capital, production, transfer,
     franchise, windfall profits, license, withholding, payroll, employment,
     disability, employer health, excise, estimated, severance, stamp,
     occupation, property, environmental, unemployment or other taxes, custom
     duties, fees, assessments or charges of any kind whatsoever, together with
     any interest and any penalties, additions to tax or additional amounts
     imposed by any taxing authority whether arising before, on or after the
     Effective Date.
 
          "Tax Returns" means any return, amended return or other report
     (including elections, declarations, disclosures, schedules, estimates and
     information returns) required to be filed with respect to any Tax.
 
          "Treasury Stock" shall mean shares of Coast Stock held by Coast or any
     of its Subsidiaries or by Ahmanson or any of its Subsidiaries, in each case
     other than in a fiduciary (including custodial or agency) capacity or as a
     result of debts previously contracted in good faith.
 
          "Trust Agreement" has the meaning set forth in Annex I hereto.
 
          "Trust Indenture Act" means the Trust Indenture Act of 1939, as
     amended, and the rules and regulations thereunder.
 
                                       A-4
<PAGE>   93
 
                                   ARTICLE II
 
                                   THE MERGER
 
     2.01  The Merger. (a) At the Effective Time, Coast shall merge with and
into Ahmanson (the "Merger"), the separate corporate existence of Coast shall
cease and Ahmanson shall survive and continue to exist as a Delaware corporation
(Ahmanson, as the surviving corporation in the Merger, sometimes being referred
to herein as the "Surviving Corporation"). Ahmanson may at any time prior to the
mailing of the Proxy Statement change the method of effecting the combination
with Coast (including, without limitation, the provisions of this Article II) if
and to the extent it deems such change to be necessary, appropriate or
desirable; provided, however, that no such change shall (i) alter or change the
amount or kind of consideration to be issued to holders of Coast Common Stock as
provided for in this Agreement, (ii) adversely affect the tax treatment of
Coast's stockholders as a result of the transactions contemplated hereby or any
payments made with respect to CPR Certificates or (iii) materially impede or
delay consummation of the transactions contemplated by this Agreement.
 
          (b) Subject to the satisfaction or waiver of the conditions set forth
     in Article VII, the Merger shall become effective upon the occurrence of
     the filing in the office of the Secretary of State of Delaware (the
     "Delaware Secretary") of a certificate of merger in accordance with Section
     251 of the DGCL or such later date and time as may be set forth in such
     certificate. The Merger shall have the effects prescribed in the DGCL.
 
          (c) Articles of Incorporation and By-Laws. The articles of
     incorporation and by-laws of Ahmanson immediately after the Merger shall be
     those of Ahmanson as in effect immediately prior to the Effective Time.
 
          (d) Directors and Officers of the Surviving Corporation. Subject to
     Section 6.16, the directors and officers of Ahmanson immediately after the
     Merger shall be the directors and officers of Ahmanson immediately prior to
     the Effective Time, until such time as their successors shall be duly
     elected and qualified.
 
     2.02  Effective Date and Effective Time. Subject to the satisfaction or
waiver of the conditions set forth in Article VII, the parties shall cause the
effective date of the Merger (the "Effective Date") to occur on (i) the fifth
business day to occur after the last of the conditions set forth in Section 7.01
shall have been satisfied or waived in accordance with the terms of this
Agreement (or, at the election of Ahmanson, on the last business day of the
month in which such day occurs or, if such last business day occurs on one of
the last five business days of such month, on the last business day of the
succeeding month) or (ii) such other date to which the parties may agree in
writing. The time on the Effective Date when the Merger shall become effective
is referred to as the "Effective Time."
 
                                  ARTICLE III
 
                       CONSIDERATION; EXCHANGE PROCEDURES
 
     3.01  Merger Consideration. Subject to the provisions of this Agreement, at
the Effective Time, and except in the case of the second paragraph of (a) below,
automatically by virtue of the Merger and without any action on the part of any
Person:
 
          (a) Outstanding Coast Common Stock and Coast Rights. Each share
     (excluding (i) Treasury Stock and (ii) shares held by holders of Coast
     Common Stock (each a "Dissenting Shareholder") who perfect their rights to
     dissent under the DGCL (the "Dissenters' Shares")) of Coast Common Stock
     issued and outstanding immediately prior to the Effective Time, together
     with each associated Coast Right, shall become and be converted into the
     right to receive 0.8082 of a share of Ahmanson Common Stock (the "Exchange
     Ratio") (with the appropriate number of Ahmanson Rights as provided in the
     Ahmanson Rights Agreement, whether or not such Ahmanson Rights shall still
     be attached to such shares). The Exchange Ratio shall be subject to
     adjustment as set forth in Section 3.05.
 
                                       A-5
<PAGE>   94
 
     Ahmanson shall enter into the Commitment with the CPR Trust at or prior to
the Effective Time and effective at the Effective Time. The shares of Ahmanson
Common Stock to be issued hereunder and the entering into of the Commitment
shall constitute the "Merger Consideration."
 
          (b) Outstanding Ahmanson Stock. Each share of Ahmanson Stock issued
     and outstanding immediately prior to the Effective Time shall remain issued
     and outstanding and unaffected by the Merger.
 
          (c) Treasury Shares. Each share of Coast Stock held as Treasury Stock
     immediately prior to the Effective Time shall be canceled and retired at
     the Effective Time and no consideration shall be issued in exchange
     therefor.
 
     3.02  Rights as Stockholders; Stock Transfers. At the Effective Time,
holders of Coast Common Stock shall cease to be, and shall have no rights as,
stockholders of Coast, other than to receive any dividend or other distribution
with respect to such Coast Common Stock with a record date occurring prior to
the Effective Time and the consideration provided under this Article III. After
the Effective Time, there shall be no transfers on the stock transfer books of
Coast or the Surviving Corporation of shares of Coast Stock.
 
     3.03  Fractional Shares. Notwithstanding any other provision hereof, no
fractional shares of Ahmanson Common Stock and no certificates or scrip
therefor, or other evidence of ownership thereof, will be issued in the Merger;
instead, Ahmanson shall pay to each holder of Coast Common Stock who would
otherwise be entitled to a fractional share of Ahmanson Common Stock (after
taking into account all Old Certificates delivered by such holder) an amount in
cash (without interest) determined by multiplying such fraction by the average
of the last sale prices of Ahmanson Common Stock, as reported by the NYSE
Composite Transactions Reporting System (as reported in The Wall Street Journal
or, if not reported therein, in another authoritative source), for the five NYSE
trading days immediately preceding the Effective Date.
 
     3.04  Exchange Procedures.
 
          (a) At or prior to the Effective Time, Ahmanson shall deposit, or
     shall cause to be deposited, with a depository institution of recognized
     standing selected by Ahmanson (in such capacity, the "Exchange Agent"), for
     the benefit of the holders of certificates formerly representing shares of
     Coast Common Stock ("Old Certificates") to be exchanged in accordance with
     this Article III, certificates representing the shares of Ahmanson Common
     Stock ("New Certificates") to which the holders of the Old Certificates are
     entitled pursuant to this Agreement, together with an estimated amount of
     cash to be paid pursuant to this Article III in exchange for outstanding
     shares of Coast Common Stock.
 
          (b) As promptly as practicable after the Effective Date, Ahmanson
     shall send or cause to be sent to each former holder of record of shares of
     Coast Common Stock immediately prior to the Effective Time transmittal
     materials for use in exchanging such stockholder's Old Certificates for the
     consideration set forth in this Article III. Ahmanson shall cause the New
     Certificates and/or any check in respect of any fractional share interests
     or dividends or distributions which such person shall be entitled to
     receive to be delivered to such stockholder upon delivery to the Exchange
     Agent of Old Certificates representing such shares of Coast Common Stock
     (or indemnity reasonably satisfactory to Ahmanson and the Exchange Agent,
     if any of such certificates are lost, stolen or destroyed) owned by such
     stockholder. No interest will be paid on any such cash to be paid in lieu
     of fractional share interests or in respect of dividends or distributions
     which any such person shall be entitled to receive pursuant to this Article
     III upon such delivery.
 
          (c) Notwithstanding the foregoing, neither the Exchange Agent nor any
     party hereto shall be liable to any former holder of Coast Common Stock for
     any amount properly delivered to a public official pursuant to applicable
     abandoned property, escheat or similar laws.
 
          (d) At the election of Ahmanson, no dividends or other distributions
     with respect to Ahmanson Common Stock with a record date occurring after
     the Effective Time shall be paid to the holder of any unsurrendered Old
     Certificate representing shares of Coast Common Stock converted in the
     Merger into the right to receive shares of such Ahmanson Common Stock. Upon
     surrender of Old Certificates (or
 
                                       A-6
<PAGE>   95
 
     indemnity reasonably satisfactory to Ahmanson and the Exchange Agent, if
     any of such certificates are lost, stolen or destroyed) in accordance with
     this Section 3.04, the record holder thereof shall be entitled to receive
     any such dividends or other distributions, without any interest thereon,
     which theretofore had become payable with respect to shares of Ahmanson
     Common Stock such holder had the right to receive upon surrender of Old
     Certificates (or delivery of such indemnity).
 
     3.05  Anti-Dilution Provisions. In the event Ahmanson changes (or
establishes a record date for changing) the number or kind of shares of Ahmanson
Common Stock issued and outstanding prior to the Effective Date as a result of a
stock split, stock dividend, recapitalization, reclassification, reorganization
or similar transaction with respect to the outstanding Ahmanson Common Stock and
the record date therefor shall be prior to the Effective Date, the Exchange
Ratio shall be proportionately adjusted in such manner as Coast and Ahmanson
shall agree, which adjustment may include, as appropriate, the issuance of
securities, property or cash on the same basis as that on which any of the
foregoing shall have been issued, distributed or paid to the holders of Ahmanson
Common Stock generally.
 
     3.06  Options, Performance Shares and Stock Appreciation Rights. (a) At the
Effective Time, each outstanding option to purchase shares of Coast Common Stock
under the Coast Stock Plans (each, a "Coast Stock Option"), whether vested or
unvested, shall be converted into an option (a "Replacement Option") to acquire,
on the same terms and conditions as were applicable under such Coast Stock
Option, (a) the number of shares of Ahmanson Common Stock equal to (i) the
number of shares of Coast Common Stock subject to the Coast Stock Option,
multiplied by (ii) the Exchange Ratio (such product rounded down to the nearest
whole number), at an exercise price per share (rounded up to the nearest whole
cent) equal to (A) the aggregate exercise price for the shares of Coast Common
Stock which were purchasable pursuant to such Coast Stock Option divided by (B)
the number of full shares of Ahmanson Common Stock subject to such Replacement
Option in accordance with the foregoing and (b) one CPR Certificate for each
share of Coast Common Stock that would have been issuable upon exercise in full
of such Coast Stock Option. At or prior to the Effective Time, Coast shall take
all necessary action, if any, including obtaining any necessary consents from
optionees, with respect to the Coast Stock Plans to permit the replacement of
the outstanding Coast Stock Options by Replacement Options pursuant to this
Section and to permit Ahmanson to assume the Coast Stock Plans. At the Effective
Time, Ahmanson shall assume the Coast Stock Plans; provided, that such
assumption shall be only in respect of the Replacement Options and that Ahmanson
shall have no obligation with respect to any awards under the Coast Stock Plans
other than the Replacement Options and shall have no obligation to make any
additional grants or awards under such assumed Coast Stock Plans.
 
          (b) Immediately prior to the Effective Time, each outstanding
     performance share award under the Coast Performance Share Award Plan shall
     be canceled and only entitle the holder thereof to receive for each share
     of Coast Common Stock with respect to such award (i) one CPR Certificate
     and (ii) an amount in cash equal to the difference between (A) the result
     of multiplying the Exchange Ratio by the average of the last sale prices of
     one share of Ahmanson Stock, as reported by the NYSE Composite Transactions
     Reporting System (as reported in The Wall Street Journal or, if not
     reported therein, in another authoritative source) for the five NYSE
     trading days immediately prior to the Effective Date and (B) the base price
     under such award. Prior to the Effective Date, Coast shall take all
     necessary action with respect to such cancellation, including obtaining any
     necessary consents from the holders of such awards.
 
          (c) Immediately prior to the Effective Time, each outstanding stock
     appreciation right under the Coast Stock Plans shall be canceled and only
     entitle the holder thereof to receive for each share of Coast Stock with
     respect to such stock appreciation right (i) one CPR Certificate and (ii)
     an amount in cash equal to the difference between (A) the result of
     multiplying the Exchange Ratio by the average of the last sale prices of
     one share of Ahmanson Stock, as reported by the NYSE Composite Transactions
     Reporting System (as reported in The Wall Street Journal or, if not
     reported therein, in another authoritative source) for the five NYSE
     trading days immediately prior to the Effective Date and (B) the grant
     price of such stock appreciation right. Prior to the Effective Date, Coast
     shall take all necessary action with respect to such cancellation,
     including obtaining any necessary consents from the holders of such stock
     appreciation rights.
 
                                       A-7
<PAGE>   96
 
          (d) If the necessary consents referred to in paragraphs (b) and (c)
     above are not obtained, the holders who do not consent shall only be
     entitled to (i) with respect to each outstanding performance share award
     under the Coast Performance Share Award Plan an amount in cash equal to the
     result of multiplying (A) the difference between the average of the last
     sale prices of one share of Coast Stock, as reported by the NYSE Composite
     Transactions Reporting System (as reported in The Wall Street Journal or,
     if not reported therein, in another authoritative source) for the five NYSE
     trading days immediately prior to the Effective Date and the base price
     under such award by (B) the total number of shares of Coast Stock with
     respect to such award and (ii) with respect to each outstanding stock
     appreciation right under the Coast Stock Plans, an amount in cash equal to
     the result of multiplying (A) the difference between the average of the
     last sale prices of one share of Coast Stock, as reported by the NYSE
     Composite Transactions Reporting System (as reported in The Wall Street
     Journal or, if not reported therein, in another authoritative source) for
     the five NYSE trading days immediately prior to the Effective Date and the
     grant price of such stock appreciation right by (B) the total number of
     shares of Coast Stock with respect to such stock appreciation right. All
     CPR Certificates with respect to the performance share awards and stock
     appreciation rights referred to in this Section shall be issued to
     Ahmanson. In the event that between the date hereof and the Effective Date
     any performance share awards or stock appreciation rights are exercised,
     Ahmanson will be entitled to retain any CPR Certificates that would
     otherwise have been issuable with respect to such performance share awards
     or stock appreciation rights upon such exercise at the Effective Date.
 
     3.07  Dissenters Rights. Any Dissenting Shareholder who shall be entitled
to be paid the "fair value" of his or her Dissenters' Shares, as provided in
Section 262 of the DGCL, shall not be entitled to the Merger Consideration in
respect thereof provided for under Section 3.01(a) unless and until such
Dissenting Shareholder shall have failed to perfect or shall have withdrawn or
lost such Dissenting Shareholder's right to dissent from the Merger under the
DGCL, and shall be entitled to receive only the payment provided for by Section
262 of the DGCL with respect to such Dissenters' Shares. If any Dissenting
Shareholder shall fail to perfect or shall have been withdrawn or lost such
right to dissent, the Dissenters' Shares held by such Dissenting Shareholder
shall thereupon be treated as though such Dissenters' Shares had been converted
into the right to receive the Merger Consideration pursuant to Section 3.01(a)
hereof.
 
                                   ARTICLE IV
 
                          ACTIONS PENDING ACQUISITION
 
     4.01  Forebearances of Coast. From the date hereof until the Effective
Time, except as expressly contemplated by this Agreement or as set forth in
paragraph 4.01 of Coast's Disclosure Schedule, without the prior written consent
of Ahmanson, Coast will not, and will cause each of its Subsidiaries not to:
 
          (a) Ordinary Course. Conduct the business of Coast and its
     Subsidiaries other than in the ordinary and usual course or fail to use
     reasonable efforts to preserve intact their business organizations and
     assets and maintain their rights, franchises and existing relations with
     customers, suppliers, employees and business associates, or take any action
     reasonably likely to have an adverse effect upon Coast's ability to perform
     any of its material obligations under this Agreement.
 
          (b) Capital Stock. Other than pursuant to Rights Previously Disclosed
     and outstanding on the date hereof, (i) issue, sell or otherwise permit to
     become outstanding, or authorize the creation of, any additional shares of
     Coast Stock or any Rights, (ii) enter into any agreement with respect to
     the foregoing, or (iii) permit any additional shares of Coast Stock to
     become subject to new grants of employee or director stock options, other
     Rights or similar stock-based employee rights.
 
          (c) Dividends, Etc. (a) Make, declare, pay or set aside for payment
     any dividend (other than dividends from wholly owned Subsidiaries to Coast
     or another wholly owned Subsidiary of Coast) on or in respect of, or
     declare or make any distribution on any shares of Coast Stock or (b)
     directly or indirectly adjust, split, combine, redeem, reclassify, purchase
     or otherwise acquire, any shares of its capital stock.
 
                                       A-8
<PAGE>   97
 
          (d) Compensation; Employment Agreements; Etc. Enter into or amend or
     renew any employment, consulting, severance or similar agreements or
     arrangements with any director, officer or employee of Coast or its
     Subsidiaries, or hire any new employees at the rank of senior vice
     president or above, or grant any salary or wage increase or increase any
     employee benefit (including incentive or bonus payments), except (i) for
     normal individual increases in compensation to employees (other than any
     senior vice presidents or any employees ranking senior to senior vice
     presidents) in the ordinary course of business consistent with past
     practice as Previously Disclosed, (ii) for other changes that are required
     by applicable law, (iii) to satisfy Previously Disclosed contractual
     obligations existing as of the date hereof, or (iv) for grants of awards to
     newly hired employees consistent with past practice as Previously
     Disclosed, (v) agreements to provide retention bonuses to employees made
     pursuant to Section 6.13(b), (vi) the annual rollover of executive
     employment agreements Previously Disclosed or (vii) agreements to provide
     bonuses for the 1997 calendar year consistent with past practice up to an
     aggregate of $1.9 million.
 
          (e) Benefit Plans. Enter into, establish, adopt or amend (except (i)
     as may be required by applicable law, (ii) to satisfy Previously Disclosed
     contractual obligations existing as of the date hereof or (iii) as
     otherwise provided herein) any pension, retirement, stock option, stock
     purchase, savings, profit sharing, deferred compensation, consulting,
     bonus, group insurance or other employee benefit, incentive or welfare
     contract, plan or arrangement, or any trust agreement (or similar
     arrangement) related thereto, in respect of any director, officer or
     employee of Coast or its Subsidiaries, or take any action to accelerate the
     vesting or exercisability of stock options, restricted stock or other
     compensation or benefits payable thereunder.
 
          (f) Dispositions. Except as Previously Disclosed, sell, transfer,
     mortgage, encumber or otherwise dispose of or discontinue any of its
     assets, deposits, business or properties except in the ordinary course of
     business and in a transaction that is not material to it and its
     Subsidiaries taken as a whole.
 
          (g) Acquisitions. Except as Previously Disclosed, acquire (other than
     by way of foreclosures or acquisitions of control in a bona fide fiduciary
     capacity or in satisfaction of debts previously contracted in good faith,
     in each case in the ordinary and usual course of business consistent with
     past practice) all or any portion of, the assets, business, deposits or
     properties of any other entity except in the ordinary course of business
     and in a transaction that is not material to it and its Subsidiaries taken
     as a whole.
 
          (h) Governing Documents. Amend the Coast Certificate, Coast By-laws or
     the certificate of incorporation or by-laws (or similar governing
     documents) of any of Coast's Subsidiaries.
 
          (i) Accounting Methods. Implement or adopt any change in its
     accounting principles, practices or methods, other than as may be required
     by generally accepted accounting principles.
 
          (j) Contracts. (i) Amend, or take any action adverse to Ahmanson with
     respect to, the Coast Rights Agreement or (ii), except in the ordinary
     course of business consistent with past practice or with the consent of
     Ahmanson (which consent shall not be unreasonably withheld or delayed),
     enter into or terminate any contract material to its assets, business or
     operations or amend or modify in any material respect any such existing
     material contract.
 
          (k) Claims. Except in the ordinary course of business consistent with
     past practice or with the consent of Ahmanson (which consent shall not be
     unreasonably withheld or delayed), settle any claim, action or proceeding
     against it, except for any claim, action or proceeding involving solely
     money damages in an amount, individually or in the aggregate for all such
     settlements, that is not material to Coast and its Subsidiaries, taken as a
     whole and that does not create precedent for claims that are reasonably
     likely to be material to Coast and its Subsidiaries taken as a whole.
 
          (l) Adverse Actions. (a) Take any action while knowing that such
     action would, or is reasonably likely to, prevent or impede the Merger from
     qualifying as a reorganization within the meaning of Section 368 of the
     Code; or (b) take any action that is intended or is known to be reasonably
     likely to result in (i) any of its representations and warranties set forth
     in this Agreement being or becoming untrue in any material respect at any
     time at or prior to the Effective Time, (ii) any of the conditions to
 
                                       A-9
<PAGE>   98
 
     the Merger set forth in Article VII not being satisfied or (iii) a material
     violation of any provision of this Agreement except, in each case, as may
     be required by applicable law or regulation.
 
          (m) Risk Management. Except as required by applicable law or
     regulation or with the consent of Ahmanson (which consent shall not be
     unreasonably withheld or delayed), (i) implement or adopt any material
     change in its interest rate and other risk management policies, procedures
     or practices or (ii) fail to follow in all material respects its existing
     policies or practices with respect to managing its exposure to interest
     rate and other risk.
 
          (n) Indebtedness. Incur any indebtedness for borrowed money other than
     in the ordinary course of business.
 
          (o) Commitments. Agree or commit to do any of the foregoing.
 
     4.02  Forebearances of Ahmanson. From the date hereof until the Effective
Time, except as expressly contemplated by this Agreement, without the prior
written consent of Coast, Ahmanson will not:
 
          (a) Dividends. Make, declare, pay or set aside for payment any
     dividends other than quarterly dividends in an amount, and with record and
     payment dates, consistent with past practice (provided that Ahmanson may
     raise its regular quarterly dividend rate by an amount not exceeding 20%).
 
          (b) Adverse Actions. (a) Take any action while knowing that such
     action would, or is reasonably likely to, prevent or impede the Merger from
     qualifying as a reorganization within the meaning of Section 368 of the
     Code; (b) repurchase any Ahmanson Stock such that an Ahmanson stockholder
     vote would be required for consummation of the Merger or which would have
     the effect of a recapitalization of Ahmanson or at prices reflecting a
     significant premium to the prices at which the Ahmanson Common Stock is
     then trading; (c) take any action that is intended or is known to be
     reasonably likely to result in (i) any of its representations and
     warranties set forth in this Agreement being or becoming untrue in any
     material respect at any time at or prior to the Effective Time, (ii) any of
     the conditions to the Merger set forth in Article VII not being satisfied
     or (iii) a material violation of any provision of this Agreement except, in
     each case, as may be required by applicable law or regulation; or
 
          (c) Commitments. Agree or commit to do any of the foregoing.
 
                                   ARTICLE V
 
                         REPRESENTATIONS AND WARRANTIES
 
     5.01  Disclosure Schedules. On or prior to the date hereof, Coast has
delivered to Ahmanson a schedule (its "Disclosure Schedule") setting forth,
among other things, items the disclosure of which is necessary or appropriate
either in response to an express disclosure requirement contained in a provision
hereof or as an exception to one or more representations or warranties contained
in Section 5.03 or to one or more of its covenants contained in Article IV;
provided, that the mere inclusion of an item in a Disclosure Schedule as an
exception to a representation or warranty shall not be deemed an admission by
Coast that such item represents a material exception or fact, event or
circumstance or that such item is reasonably likely to result in a Material
Adverse Effect. Coast represents and warrants that its Disclosure Schedule is
true and correct in all material respects and does not omit any item or
information material to the applicable paragraph in Section 5.03 and required to
be disclosed therein.
 
     5.02  Standard. No representation or warranty of Coast or Ahmanson
contained in Section 5.03 or 5.04, shall be deemed untrue or incorrect, and no
party hereto shall be deemed to have breached a representation or warranty, as a
consequence of the existence of any fact, event or circumstance unless such
fact, circumstance or event, individually or taken together with all other
facts, events or circumstances inconsistent with any representation or warranty
contained in Section 5.03 or 5.04 has had or is reasonably likely to have a
Material Adverse Effect on the party making such representation or warranty.
 
     5.03  Representations and Warranties of Coast. Subject to Sections 5.01 and
5.02 and except as Previously Disclosed in the applicable paragraph of its
Disclosure Schedule, or any other paragraph of the
 
                                      A-10
<PAGE>   99
 
Disclosure Schedule so long as it is clear from the context of the disclosure
that the disclosure in such other paragraph of the Disclosure Schedule is also
applicable to the paragraph of this Section 5.03 in question, Coast hereby
represents and warrants to Ahmanson:
 
          (a) Organization, Standing and Authority. Coast is a corporation duly
     organized, validly existing and in good standing under the laws of the
     State of Delaware. Coast is duly qualified to do business and is in good
     standing in the states of the United States and any foreign jurisdictions
     where its ownership or leasing of property or assets or the conduct of its
     business requires it to be so qualified. Coast is duly registered as a
     savings and loan holding company under HOLA. Coast Federal is a qualified
     thrift lender pursuant to Section 10(m) of HOLA and its deposits are
     insured by the FDIC through the SAIF to the fullest extent permitted by
     law. Coast Federal is a member in good standing of the FHLBSF.
 
          (b) Coast Stock. As of the date hereof, the authorized capital stock
     of Coast consists solely of (i) 100,000,000 shares of Coast Common Stock,
     of which no more than 18,645,327 shares are outstanding as of the date
     hereof and (ii) 50,000,000 shares of Coast Preferred Stock, of which no
     shares are outstanding as of the date hereof. As of the date hereof, no
     shares of Coast Common Stock and no shares of Coast Preferred Stock were
     held in treasury by Coast or otherwise owned by Coast or its Subsidiaries.
     The outstanding shares of Coast Common Stock have been duly authorized and
     are validly issued and outstanding, fully paid and nonassessable, and
     subject to no preemptive rights (and were not issued in violation of any
     preemptive rights). As of the date hereof, except as Previously Disclosed,
     there are no shares of Coast Stock authorized and reserved for issuance,
     Coast does not have any Rights issued or outstanding with respect to Coast
     Stock, and Coast does not have any commitment to authorize, issue or sell
     any Coast Stock or Rights. The number of shares of Coast Common Stock which
     are issuable and reserved for issuance upon exercise of Coast Stock Options
     as of the date hereof (and the exercise price thereof) are Previously
     Disclosed in Coast's Disclosure Schedule.
 
          (c) Subsidiaries. (i)(A) Coast has Previously Disclosed in its
     Disclosure Schedule a list of all of its Subsidiaries together with the
     jurisdiction of organization of each such Subsidiary, (B) except as
     Previously Disclosed, it owns, directly or indirectly, all the issued and
     outstanding equity securities of each of its Subsidiaries, (C) no equity
     securities of any of its Subsidiaries are or may become required to be
     issued (other than to it or its wholly-owned Subsidiaries) by reason of any
     Right or otherwise, (D) there are no contracts, commitments, understandings
     or arrangements by which any of such Subsidiaries is or may be bound to
     sell or otherwise transfer any equity securities of any such Subsidiaries
     (other than to it or its wholly-owned Subsidiaries), (E) there are no
     contracts, commitments, understandings, or arrangements relating to its
     rights to vote or to dispose of such securities and (F) all the equity
     securities of each Subsidiary held by Coast or its Subsidiaries are fully
     paid and nonassessable and are owned by Coast or its Subsidiaries free and
     clear of any Liens.
 
             (ii) Coast does not own beneficially, directly or indirectly, any
        equity securities or similar interests of any Person (other than in a
        fiduciary capacity or in connection with the foreclosure of security
        interests or as a result of similar enforcement remedies in connection
        with loans made in the ordinary course of business), or any interest in
        a partnership or joint venture of any kind, other than in its
        Subsidiaries.
 
             (iii) Each of Coast's Subsidiaries has been duly organized and is
        validly existing in good standing under the laws of the jurisdiction of
        its organization, and is duly qualified to do business and in good
        standing in the jurisdictions where its ownership or leasing of property
        or the conduct of its business requires it to be so qualified.
 
          (d) Corporate Power. Coast and each of its Subsidiaries has the
     corporate power and authority to carry on its business as it is now being
     conducted and to own all its properties and assets; and Coast has the
     corporate power and authority to execute, deliver and perform its
     obligations under this Agreement and to consummate the transactions
     contemplated hereby.
 
          (e) Corporate Authority. Subject in the case of this Agreement to
     receipt of the requisite approval of the agreement of merger set forth in
     this Agreement by the holders of a majority of the outstanding
 
                                      A-11
<PAGE>   100
 
     shares of Coast Common Stock entitled to vote thereon (which is the only
     stockholder vote required thereon), this Agreement and the transactions
     contemplated hereby have been authorized by all necessary corporate action
     of Coast and the Coast Board on or prior to the date hereof. This Agreement
     is a valid and legally binding obligation of Coast, enforceable in
     accordance with its terms (except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
     transfer and similar laws of general applicability relating to or affecting
     creditors' rights or by general equity principles). The Coast Board has
     received the written opinion of Goldman, Sachs & Co. to the effect that as
     of the date hereof the consideration to be received by the holders of Coast
     Common Stock in the Merger is fair to the holders of Coast Common Stock
     from a financial point of view.
 
          (f) Regulatory Approvals; No Defaults. (i) No consents or approvals
     of, or filings or registrations with, any Governmental Authority or with
     any third party are required to be made or obtained by Coast or any of its
     Subsidiaries in connection with the execution, delivery or performance by
     Coast of this Agreement or to consummate the Merger except for (A) filings
     and approvals of applications with and by the OTS, (B) filings with the SEC
     and state securities authorities and the approval of this Agreement by the
     stockholders of Coast, and (C) the filing of a certificate of merger with
     the Delaware Secretary pursuant to the DGCL. As of the date hereof, Coast
     is not aware of any reason why the approvals set forth in Section 7.01(b)
     will not be received without the imposition of a condition, restriction or
     requirement of the type described in Section 7.01(b).
 
             (ii) Subject to receipt of the regulatory approvals referred to in
        the preceding paragraph, and expiration of related waiting periods, and
        required filings under federal and state securities laws, the execution,
        delivery and performance of this Agreement and the consummation of the
        transactions contemplated hereby do not and will not (A) constitute a
        breach or violation of, or a default under, or give rise to any Lien,
        any acceleration of remedies or any right of termination under, any law,
        rule or regulation or any judgment, decree, order, governmental permit
        or license, or agreement, indenture or instrument of Coast or of any of
        its Subsidiaries or to which Coast or any of its Subsidiaries or
        properties is subject or bound, (B) constitute a breach or violation of,
        or a default under, the Coast Certificate or the Coast By-Laws, or (C)
        require any consent or approval under any such law, rule, regulation,
        judgment, decree, order, governmental permit or license, agreement,
        indenture or instrument.
 
          (g) Financial Reports and Regulatory Documents. (i) Coast's Annual
     Reports on Form 10-K for the fiscal years ended December 31, 1994, 1995 and
     1996, and all other reports, registration statements, definitive proxy
     statements or information statements filed or to be filed by it or any of
     its Subsidiaries subsequent to December 31, 1994 under the Securities Act,
     under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act or under the
     securities regulations of the OTS, in the form filed or to be filed
     (collectively, Coast's "Regulatory Documents") with the SEC or the OTS, as
     applicable, as of the date filed, (A) complied or will comply in all
     material respects as to form with the applicable requirements under the
     Securities Act, the Exchange Act or the securities regulations of the OTS,
     as the case may be, and (B) did not and will not contain any untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements therein, in the light
     of the circumstances under which they were made, not misleading; and each
     of the consolidated balance sheets contained in or incorporated by
     reference into any such Regulatory Document (including the related notes
     and schedules thereto) fairly presents, or will fairly present, the
     consolidated financial position of Coast and its Subsidiaries as of its
     date, and each of the consolidated statements of income and changes in
     stockholders' equity and cash flows or equivalent statements in such
     Regulatory Documents (including any related notes and schedules thereto)
     fairly presents, or will fairly present, the consolidated results of
     operations, changes in stockholders' equity and changes in cash flows, as
     the case may be, of Coast and its Subsidiaries for the periods to which
     they relate, in each case in accordance with generally accepted accounting
     principles consistently applied during the periods involved, except in each
     case as may be noted therein, subject to normal year-end audit adjustments
     and the lack of complete footnote disclosure in the case of unaudited
     statements.
 
                                      A-12
<PAGE>   101
 
             (ii) Except as Previously Disclosed in its Disclosure Schedule,
        since December 31, 1996, Coast and its Subsidiaries have not incurred
        any liability other than in the ordinary course of business consistent
        with past practice (other than liabilities (A) with respect to expenses
        related to this Agreement and the transactions contemplated hereby and
        (B) with respect to other possible merger transactions all of which have
        been expensed or reserved for).
 
             (iii) Since December 31, 1996, (A) Coast and its Subsidiaries have
        conducted their respective businesses in the ordinary and usual course
        consistent with past practice (excluding the incurrence of expenses
        related to this Agreement and the transactions contemplated hereby and
        other possible merger transactions) and (B) no event has occurred or
        circumstance arisen that, individually or taken together with all other
        facts, circumstances and events (described in any paragraph of Section
        5.03 or otherwise), is reasonably likely to have a Material Adverse
        Effect with respect to Coast.
 
          (h) Litigation. No litigation, claim or other proceeding before any
     court or governmental agency is pending against Coast or any of its
     Subsidiaries and, to Coast's knowledge, no such litigation, claim or other
     proceeding has been threatened.
 
          (i) Regulatory Matters. (i) Neither Coast nor any of its Subsidiaries
     or properties is a party to or is subject to any order, decree, agreement,
     memorandum of understanding or similar arrangement with, or a commitment
     letter or similar submission to, or extraordinary supervisory letter from,
     any federal or state governmental agency or authority charged with the
     supervision or regulation of financial institutions or issuers of
     securities or engaged in the insurance of deposits (including, without
     limitation, the OTS and the FDIC) or the supervision or regulation of it or
     any of its Subsidiaries (collectively, the "Regulatory Authorities").
 
             (ii) Neither Coast nor any of its Subsidiaries has been advised by
        any Regulatory Authority that such Regulatory Authority is contemplating
        issuing or requesting (or is considering the appropriateness of issuing
        or requesting) any such order, decree, agreement, memorandum of
        understanding, commitment letter, supervisory letter or similar
        submission.
 
          (j) Compliance with Laws. Coast and each of its Subsidiaries:
 
             (i) is in compliance with all applicable federal, state, local and
        foreign statutes, laws, regulations, ordinances, rules, judgments,
        orders or decrees applicable thereto or to the employees conducting such
        businesses, including, without limitation, the Equal Credit Opportunity
        Act, the Fair Housing Act, the Community Reinvestment Act, the Home
        Mortgage Disclosure Act and all other applicable fair lending laws and
        other laws relating to discriminatory business practices;
 
             (ii) has all permits, licenses, authorizations, orders and
        approvals of, and has made all filings, applications and registrations
        with, all Governmental Authorities that are required in order to permit
        them to own or lease their properties and to conduct their businesses
        substantially as presently conducted; all such permits, licenses,
        certificates of authority, orders and approvals are in full force and
        effect; and, to Coast's knowledge, no suspension or cancellation of any
        of them is threatened; and
 
             (iii) has received, since December 31, 1996, no notification or
        communication from any Governmental Authority (A) asserting that Coast
        or any of its Subsidiaries is not in compliance with any of the
        statutes, regulations, or ordinances which such Governmental Authority
        enforces or (B) threatening to revoke any license, franchise, permit, or
        governmental authorization (nor, to Coast's knowledge, do any grounds
        for any of the foregoing exist).
 
          (k) Material Contracts; Defaults. Except for those agreements and
     other documents filed as exhibits to its Regulatory Documents, neither
     Coast nor any of its Subsidiaries is a party to, bound by or subject to any
     agreement, contract, arrangement, commitment or understanding (whether
     written or oral) (i) that is a "material contract" within the meaning of
     Item 601(b)(10) of the SEC's Regulation S-K or (ii) that materially
     restricts the conduct of business by it or any of its Subsidiaries.
 
                                      A-13
<PAGE>   102
 
     Neither Coast nor any of its Subsidiaries is in default in any material
     respect under any material contract, agreement, commitment, arrangement,
     lease, insurance policy or other instrument to which it is a party, by
     which its respective assets, business, or operations may be bound or
     affected, or under which it or its respective assets, business, or
     operations receives benefits, or under any other contract if such default
     could reasonably be expected to have a Material Adverse Effect on Coast,
     and in either case there has not occurred any event that, with the lapse of
     time or the giving of notice or both, would constitute such a default.
 
          (l) No Brokers. No action has been taken by Coast that would give rise
     to any valid claim against any party hereto for a brokerage commission,
     finder's fee or other like payment with respect to the transactions
     contemplated by this Agreement, excluding a Previously Disclosed fee to be
     paid to Goldman, Sachs & Co.
 
          (m) Employee Benefit Plans. (i) Section 5.03(m)(i) of Coast's
     Disclosure Schedule contains a complete and accurate list of all existing
     bonus, incentive, deferred compensation, pension, retirement,
     profit-sharing, thrift, savings, employee stock ownership, stock bonus,
     stock purchase, restricted stock, stock option, severance, welfare and
     fringe benefit plans, employment or severance agreements and all similar
     practices, policies and arrangements in which any employee or former
     employee (the "Employees"), consultant or former consultant (the
     "Consultants") or director or former director (the "Directors") of Coast or
     any of its Subsidiaries participates or to which any such Employees,
     Consultants or Directors are a party (the "Compensation and Benefit
     Plans"). Neither Coast nor any of its Subsidiaries has any commitment to
     create any additional Compensation and Benefit Plan or to modify or change
     any existing Compensation and Benefit Plan.
 
             (ii) Each Compensation and Benefit Plan has been operated and
        administered in all material respects in accordance with its terms and
        with applicable law, including, but not limited to, ERISA, the Code, the
        Securities Act, the Exchange Act, the Age Discrimination in Employment
        Act, or any regulations or rules promulgated thereunder, and all
        filings, disclosures and notices required by ERISA, the Code, the
        Securities Act, the Exchange Act, the Age Discrimination in Employment
        Act and any other applicable law have been timely made. Each
        Compensation and Benefit Plan which is an "employee pension benefit
        plan" within the meaning of Section 3(2) of ERISA (a "Pension Plan") and
        which is intended to be qualified under Section 401(a) of the Code has
        received a favorable determination letter (including a determination
        that the related trust under such Compensation and Benefit Plan is
        exempt from tax under Section 501(a) of the Code) from the Internal
        Revenue Service ("IRS") for "TRA" (as defined in Rev. Proc. 93-39), or
        will file for such determination letter prior to the expiration of the
        remedial amendment period for such Compensation and Benefit Plan, and
        Coast is not aware of any circumstances likely to result in revocation
        of any such favorable determination letter. There is no material pending
        or, to the knowledge of Coast, threatened legal action, suit or claim
        relating to the Compensation and Benefit Plans. Neither Coast nor any of
        its Subsidiaries has engaged in a transaction, or omitted to take any
        action, with respect to any Compensation and Benefit Plan that would
        reasonably be expected to subject Coast or any of its Subsidiaries to a
        tax or penalty imposed by either Section 4975 of the Code or Section 502
        of ERISA, assuming for purposes of Section 4975 of the Code that the
        taxable period of any such transaction expired as of the date hereof.
 
             (iii) No liability (other than for payment of premiums to the PBGC
        which have been made or will be made on a timely basis) under Title IV
        of ERISA has been or is expected to be incurred by Coast or any of its
        Subsidiaries with respect to any ongoing, frozen or terminated
        "single-employer plan", within the meaning of Section 4001(a)(15) of
        ERISA, currently or formerly maintained by any of them, or any
        single-employer plan of any entity (an "ERISA Affiliate") which is
        considered one employer with Coast under Section 4001(a)(14) of ERISA or
        Section 414(b) or (c) of the Code (an "ERISA Affiliate Plan"). None of
        Coast, any of its Subsidiaries or any ERISA Affiliate has contributed,
        or has been obligated to contribute, to a multiemployer plan under
        Subtitle E of Title IV of ERISA during the preceding five calendar
        years. No notice of a "reportable event," within the meaning of Section
        4043 of ERISA for which the 30-day reporting requirement has not
 
                                      A-14
<PAGE>   103
 
        been waived, has been required to be filed for any Compensation and
        Benefit Plan or by any ERISA Affiliate Plan within the 12-month period
        ending on the date hereof, and no such notice will be required to be
        filed as a result of the transactions contemplated by this Agreement.
        The PBGC has not instituted proceedings to terminate any Pension Plan or
        ERISA Affiliate Plan and, to Coast's knowledge, no condition exists that
        presents a material risk that such proceedings will be instituted. To
        the knowledge of Coast, there is no pending investigation or enforcement
        action by the PBGC, the Department of Labor or IRS or any other
        governmental agency with respect to any Compensation and Benefit Plan.
        Under each Pension Plan and ERISA Affiliate Plan, as of the date of the
        most recent actuarial valuation performed prior to the date of this
        Agreement, the actuarially determined present value of all "benefit
        liabilities," within the meaning of Section 4001(a)(16) of ERISA (as
        determined on the basis of the actuarial assumptions contained in such
        actuarial valuation of such Pension Plan or ERISA Affiliate Plan), did
        not exceed the then current value of the assets of such Pension Plan or
        ERISA Affiliate Plan and since such date there has been neither an
        adverse change in the financial condition of such Pension Plan or ERISA
        Affiliate Plan nor any amendment or other change to such Pension Plan or
        ERISA Affiliate Plan that would increase the amount of benefits
        thereunder which in either case reasonably could be expected to change
        such result.
 
             (iv) All contributions required to be made under the terms of any
        Compensation and Benefit Plan or ERISA Affiliate Plan or any employee
        benefit arrangements under any collective bargaining agreement to which
        Coast or any of its Subsidiaries is a party have been timely made or
        have been reflected on Coast's financial statements to the extent
        required by generally accepted accounting principles. Neither any
        Pension Plan nor any ERISA Affiliate Plan has an "accumulated funding
        deficiency" (whether or not waived) within the meaning of Section 412 of
        the Code or Section 302 of ERISA and all required payments to the PBGC
        with respect to each Pension Plan or ERISA Affiliate Plan have been made
        on or before their due dates. None of Coast, any of its Subsidiaries or
        any ERISA Affiliate (x) has provided, or would reasonably be expected to
        be required to provide, security to any Pension Plan or to any ERISA
        Affiliate Plan pursuant to Section 401(a)(29) of the Code, and (y) has
        taken any action, or omitted to take any action, that has resulted, or
        would reasonably be expected to result, in the imposition of a lien
        under Section 412(n) of the Code or pursuant to ERISA.
 
             (v) Neither Coast nor any of its Subsidiaries has any obligations
        to provide retiree health and life insurance or other retiree death
        benefits under any Compensation and Benefit Plan, other than benefits
        mandated by Section 4980B of the Code, and each such Compensation and
        Benefit Plan may be amended or terminated without incurring liability
        thereunder. There has been no communication to Employees by Coast or any
        of its Subsidiaries that would reasonably be expected to promise or
        guarantee such Employees retiree health or life insurance or other
        retiree death benefits on a permanent basis.
 
             (vi) Coast and its Subsidiaries do not maintain any Compensation
        and Benefit Plans covering foreign Employees.
 
             (vii) With respect to each Compensation and Benefit Plan, if
        applicable, Coast has provided or made available to Ahmanson, true and
        complete copies of its existing (A) Compensation and Benefit Plan
        documents and amendments thereto and (B) trust instruments and insurance
        contracts.
 
             (viii) The consummation of the transactions contemplated by this
        Agreement would not, directly or indirectly (including, without
        limitation, as a result of any termination of employment prior to or
        following the Effective Time) reasonably be expected to (A) entitle any
        Employee, Consultant or Director to any payment (including severance pay
        or similar compensation) or any increase in compensation, (B) result in
        the vesting or acceleration of any benefits under any Compensation and
        Benefit Plan or (C) result in any material increase in benefits payable
        under any Compensation and Benefit Plan.
 
                                      A-15
<PAGE>   104
 
             (ix) Neither Coast nor any of its Subsidiaries maintains any
        compensation plans, programs or arrangements the payments under which
        would not reasonably be expected to be deductible as a result of the
        limitations under Section 162(m) of the Code and the regulations issued
        thereunder.
 
             (x) As a result, directly or indirectly, of the transactions
        contemplated by this Agreement (including, without limitation, as a
        result of any termination of employment prior to or following the
        Effective Time), none of Ahmanson, Coast or the Surviving Corporation,
        or any of their respective Subsidiaries will be obligated to make a
        payment that would be characterized as an "excess parachute payment" to
        an employee or consultant of Coast who is a "disqualified individual"
        (as such terms are defined in Section 280G of the Code), without regard
        to whether such payment is reasonable compensation for personal services
        performed or to be performed in the future.
 
          (n) Labor Matters. Neither Coast nor any of its Subsidiaries is a
     party to or is bound by any collective bargaining agreement, contract or
     other agreement or understanding with a labor union or labor organization,
     nor is Coast or any of its Subsidiaries the subject of a proceeding
     asserting that it or any such Subsidiary has committed an unfair labor
     practice (within the meaning of the National Labor Relations Act) or
     seeking to compel Coast or any such Subsidiary to bargain with any labor
     organization as to wages or conditions of employment, nor is there any
     strike or other labor dispute involving it or any of its Subsidiaries
     pending or, to Coast's knowledge, threatened, nor is Coast aware of any
     activity involving its or any of its Subsidiaries' employees seeking to
     certify a collective bargaining unit or engaging in other organizational
     activity.
 
          (o) Takeover Laws; Dissenters Rights. Coast has taken all action
     required to be taken by it in order to exempt this Agreement, and the
     transactions contemplated hereby from, and this Agreement and the
     transactions contemplated hereby are exempt from, the requirements of any
     "moratorium," "control share," "fair price," "affiliate transaction,"
     "business combination" or other antitakeover laws and regulations of any
     state (collectively, "Takeover Laws"), including, without limitation, the
     State of Delaware, and including, without limitation, Section 203 of the
     DGCL.
 
          (p) Environmental Matters. To the best knowledge of Coast, neither the
     conduct nor operation of Coast or its Subsidiaries nor any condition of any
     property presently or previously owned, leased or operated by any of them
     (including, without limitation, in a fiduciary or agency capacity), or on
     which any of them holds a Lien, violates or violated Environmental Laws and
     no condition has existed or event has occurred with respect to any of them
     or any such property that, with notice or the passage of time, or both, is
     reasonably likely to result in liability under Environmental Laws. Neither
     Coast nor any of its Subsidiaries has received any notice from any person
     or entity that Coast or its Subsidiaries or the operation or condition of
     any property ever owned, leased, operated, or held as collateral or in a
     fiduciary capacity by any of them are or were in violation of or otherwise
     are alleged to have liability under any Environmental Law, including, but
     not limited to, responsibility (or potential responsibility) for the
     cleanup or other remediation of any pollutants, contaminants, or hazardous
     or toxic wastes, substances or materials at, on, beneath, or originating
     from any such property.
 
          (q) Tax Matters. (i)(A) All federal, state, local and foreign Tax
     Returns (including information returns) required to be filed by or on
     behalf of Coast or its Subsidiaries have been prepared in good faith and
     duly and timely filed, and all such filed Tax Returns are complete and
     accurate in all material respects. (B) Coast and each of its Subsidiaries
     have paid in full all Taxes due (including interest and penalties) or have
     provided adequate reserves for any such Taxes in the financial statements
     of Coast in accordance with generally accepted accounting principles,
     whether or not shown as being due on any of the Tax Returns referred to in
     clause (i)(A). (C) Neither Coast nor any of its Subsidiaries has received
     any memorandum or opinion from legal counsel that was sought in order to
     satisfy the reasonable cause exception (set forth in Section 6664(c) of the
     Code) applicable to the penalties for certain underpayments of Taxes set
     forth in Sections 6662 through 6664 of the Code. (D) There is no pending or
     threatened audit, examination, assessment or proposed assessment of a
     deficiency, or refund litigation with respect to any Taxes of Coast or its
     Subsidiaries. (E) All Taxes, interest, additions and penalties due with
     respect to completed and settled examinations or concluded litigation
     relating to Taxes of Coast or
 
                                      A-16
<PAGE>   105
 
     its Subsidiaries have been paid in full or adequate provision has been made
     for any such Taxes (in accordance with generally accepted accounting
     principles) on the financial statements of Coast. (F) Neither Coast nor its
     Subsidiaries has executed an extension or waiver of any statute of
     limitations on the assessment or collection of any Tax due that is
     currently in effect. (G) No power of attorney has been granted by or with
     respect to Coast or any of its Subsidiaries with respect to any matter
     relating to Taxes. (H) Neither Coast nor any of its Subsidiaries has made
     or will make a material election as to Taxes during the period from January
     1, 1997 through the Effective Time, other than elections made on tax
     returns filed for the year ended on December 31, 1996.
 
             (ii)(A) No liens or other security interests have been imposed on
        any assets of Coast or its Subsidiaries in connection with any failure
        (or alleged failure) to pay any Tax. (B) Coast and its Subsidiaries have
        timely withheld, and paid over to the relevant governmental authority or
        other appropriate payee, all Taxes required to have been withheld and
        paid in connection with amounts paid or owing to any employee,
        independent contractor, creditor, stockholder, or other person. (C)
        Neither Coast nor any of its Subsidiaries is a party to any tax
        allocation or sharing agreement under which it has obligations to a
        party other than Coast or its Subsidiaries, is or has been a member of
        an affiliated group filing consolidated or combined tax returns (other
        than a group the common parent of which is or was Coast) or otherwise
        has any liability for the Taxes of any person (other than Coast or its
        Subsidiaries). (D) Neither Coast nor any of its Subsidiaries has any
        deferred intercompany gain or loss arising as a result of a deferred
        intercompany transaction within the meaning of Treasury Regulation
        Section 1.1502-13 (or similar provision under state, local or foreign
        law) or any excess loss accounts within the meaning of Treasury
        Regulation Section 1.1502-19. (E) Coast is not and has not been a United
        States real property holding corporation (as defined in Section
        897(c)(2) of the Code) during the applicable period specified in Section
        897(c)(1)(ii) of the Code.
 
             (iii) As of the date hereof, neither Coast nor any of its
        Subsidiaries has any reason to believe that any conditions exist that
        might prevent or impede the Merger from qualifying as a reorganization
        within the meaning of Section 368 of the Code, or otherwise prevent the
        conditions in Section 7.02 from being met.
 
          (r) Risk Management Instruments. All interest rate swaps, caps,
     floors, option agreements, futures and forward contracts and other similar
     risk management arrangements, whether entered into for Coast's own account,
     or for the account of one or more of Coast's Subsidiaries or their
     customers (all of which are listed on Coast's Disclosure Schedule), were
     entered into in accordance with all applicable laws, rules, regulations and
     regulatory policies and with counterparties believed to be financially
     responsible at the time; each of them constitutes the valid and legally
     binding obligation of Coast or one of its Subsidiaries, enforceable in
     accordance with its terms (except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
     transfer and similar laws of general applicability relating to or affecting
     creditors' rights or by general equity principles), and are in full force
     and effect. Neither Coast nor its Subsidiaries, nor to Coast's knowledge,
     any other party thereto, is in breach of any of its obligations under any
     such agreement or arrangement.
 
          (s) Books and Records. The books and records of Coast and its
     Subsidiaries have been fully, properly and accurately maintained in all
     material respects, and there are no material inaccuracies or discrepancies
     of any kind contained or reflected therein, and they fairly present the
     financial position of Coast and its Subsidiaries.
 
          (t) Insurance. Coast's Disclosure Schedule sets forth all of the
     insurance policies, binders, or bonds maintained by Coast or its
     Subsidiaries ("Insurance Policies"). Coast and its Subsidiaries are insured
     with reputable insurers against such risks and in such amounts as the
     management of Coast reasonably has determined to be prudent in accordance
     with industry practices. All the Insurance Policies are in full force and
     effect; Coast and its Subsidiaries are not in material default thereunder;
     and all claims thereunder have been filed in due and timely fashion.
 
                                      A-17
<PAGE>   106
 
          (u) Disclosure. The representations and warranties contained in this
     Section 5.03 do not contain any untrue statement of a material fact or omit
     to state any material fact necessary in order to make the statements and
     information contained in this Section 5.03 not misleading.
 
     5.04 Representations and Warranties of Ahmanson. Subject to Section 5.02,
Ahmanson hereby represents and warrants to Coast as follows:
 
          (a) Organization, Standing and Authority. Ahmanson is a corporation
     duly organized, validly existing and in good standing under the laws of the
     State of Delaware. Ahmanson is duly qualified to do business and is in good
     standing in the states of the United States and foreign jurisdictions where
     its ownership or leasing of property or assets or the conduct of its
     business requires it to be so qualified. Ahmanson has in effect all
     federal, state, local, and foreign governmental authorizations necessary
     for it to own or lease its properties and assets and to carry on its
     business as it is now conducted. Ahmanson is duly registered as a savings
     and loan holding company under HOLA.
 
          (b) Ahmanson Stock. (i) As of the date hereof, the authorized capital
     stock of Ahmanson consists solely of 220,000,000 shares of Ahmanson Common
     Stock, of which no more than 94,441,674 shares were outstanding as of the
     date hereof, and 10,000,000 shares of Ahmanson Preferred Stock, of which no
     more than 780,000 shares of 8.40% Series C preferred stock and 575,000
     shares of 6% Cumulative Convertible Series D preferred stock were
     outstanding as of the date hereof. As of the date hereof, except for Rights
     issued pursuant to the Ahmanson Rights Agreement, Ahmanson's 1996
     Nonemployee Directors' Stock Incentive Plan, Ahmanson's 1993 Stock
     Incentive Plan, Ahmanson's 1988 Directors' Stock Incentive Plan and
     Ahmanson's 1984 Stock Incentive Plan or upon conversion of Ahmanson's 6%
     Cumulative Convertible Series D preferred stock, Ahmanson does not have any
     Rights issued or outstanding with respect to Ahmanson Stock and Ahmanson
     does not have any commitment to authorize, issue or sell any Ahmanson Stock
     or Rights, except pursuant to this Agreement.
 
             (ii) The shares of Ahmanson Common Stock to be issued in exchange
        for shares of Coast Common Stock in the Merger, when issued in
        accordance with the terms of this Agreement, will be duly authorized,
        validly issued, fully paid and nonassessable and not subject to
        pre-emptive rights.
 
          (c) Subsidiaries. Each of Ahmanson's Significant Subsidiaries has been
     duly organized and is validly existing in good standing under the laws of
     the jurisdiction of its organization, and is duly qualified to do business
     and in good standing in the jurisdictions where its ownership or leasing of
     property or the conduct of its business requires it to be so qualified and
     it owns, directly or indirectly, all the issued and outstanding equity
     securities of each of its Significant Subsidiaries.
 
          (d) Corporate Power. Ahmanson and each of its Significant Subsidiaries
     has the corporate power and authority to carry on its business as it is now
     being conducted and to own all its properties and assets; and Ahmanson has
     the corporate power and authority to execute, deliver and perform its
     obligations under this Agreement and to consummate the transactions
     contemplated hereby.
 
          (e) Corporate Authority. (i) This Agreement and the transactions
     contemplated hereby have been authorized by all necessary corporate action
     of Ahmanson and the Ahmanson Board. This Agreement is a valid and legally
     binding agreement of Ahmanson enforceable in accordance with its terms
     (except as enforceability may be limited by applicable bankruptcy,
     insolvency, reorganization, moratorium, fraudulent transfer and similar
     laws of general applicability relating to or affecting creditors' rights or
     by general equity principles). No Ahmanson stockholder approval is required
     for this Agreement and the transactions contemplated hereby under the DGCL,
     Ahmanson's certificate of incorporation or Ahmanson's by-laws or the rules
     of the NYSE.
 
             (ii) The entering into of the Commitment has been authorized by all
        necessary corporate action of Ahmanson. The entering into of the
        Commitment will not (A) constitute a breach or violation of, or a
        default under, or give rise to any Lien, any acceleration of remedies or
        any right of termination under, any law, rule or regulation or any
        judgment, decree, order, governmental permit or license, or agreement,
        indenture or instrument of Ahmanson or of any of its Subsidiaries or to
        which Ahmanson or any of its Subsidiaries or properties is subject or
        bound, (B) constitute a breach
 
                                      A-18
<PAGE>   107
 
        or violation of, or a default under, the certificate of incorporation or
        by-laws of Ahmanson, or (C) require any consent or approval under any
        such law, rule, regulation, judgment, decree, order, governmental permit
        or license, agreement, indenture or instrument.
 
          (f) Regulatory Approvals; No Defaults. (i) No consents or approvals
     of, or filings or registrations with, any Governmental Authority or with
     any third party are required to be made or obtained by Ahmanson or any of
     its Subsidiaries in connection with the execution, delivery or performance
     by Ahmanson of this Agreement or to consummate the Merger except for (A)
     the filings and approvals of applications with and by the OTS; (B) approval
     of the listing on the NYSE of Ahmanson Common Stock to be issued in the
     Merger; (C) the filing and declaration of effectiveness of the Ahmanson
     Registration Statement; (D) the filing of a certificate of merger with the
     Delaware Secretary pursuant to the DGCL; and (E) such filings as are
     required to be made or approvals as are required to be obtained under the
     securities or "Blue Sky" laws of various states in connection with the
     issuance of Ahmanson Stock in the Merger. As of the date hereof, Ahmanson
     is not aware of any reason why the approvals set forth in Section 7.01(b)
     will not be received without the imposition of a condition, restriction or
     requirement of the type described in Section 7.01(b).
 
             (ii) Subject to receipt of the regulatory approvals referred to in
        the preceding paragraph and expiration of the related waiting periods,
        and required filings under federal and state securities laws, the
        execution, delivery and performance of this Agreement and the
        consummation of the transactions contemplated hereby do not and will not
        (A) constitute a breach or violation of, or a default under, or give
        rise to any Lien, any acceleration of remedies or any right of
        termination under, any law, rule or regulation or any judgment, decree,
        order, governmental permit or license, or agreement, indenture or
        instrument of Ahmanson or of any of its Subsidiaries or to which
        Ahmanson or any of its Subsidiaries or properties is subject or bound,
        (B) constitute a breach or violation of, or a default under, the
        certificate of incorporation or by-laws (or similar governing documents)
        of Ahmanson or any of its Subsidiaries, or (C) require any consent or
        approval under any such law, rule, regulation, judgment, decree, order,
        governmental permit or license, agreement, indenture or instrument.
 
          (g) Financial Reports and Regulatory Documents; Material Adverse
     Effect. (i) Ahmanson's Regulatory Documents, as of the date filed, (A)
     complied or will comply in all material respects as to form with the
     applicable requirements under the Securities Act or the Exchange Act, as
     the case may be, and (B) did not and will not contain any untrue statement
     of a material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein, in the light of the
     circumstances under which they were made, not misleading; and each of the
     balance sheets contained in or incorporated by reference into any such
     Regulatory Document (including the related notes and schedules thereto)
     fairly presents, or will fairly present, the financial position of Ahmanson
     and its Subsidiaries as of its date, and each of the statements of income
     and changes in stockholders' equity and cash flows or equivalent statements
     in such Regulatory Documents (including any related notes and schedules
     thereto) fairly presents, or will fairly present, the results of
     operations, changes in stockholders' equity and changes in cash flows, as
     the case may be, of Ahmanson and its Subsidiaries for the periods to which
     they relate, in each case in accordance with generally accepted accounting
     principles consistently applied during the periods involved, except in each
     case as may be noted therein, subject to normal year-end audit adjustments
     and the lack of complete footnote disclosure in the case of unaudited
     statements.
 
             (ii) Since December 31, 1996, no event has occurred or circumstance
        arisen that, individually or taken together with all other facts,
        circumstances and events (described in any paragraph of Section 5.04 or
        otherwise), is reasonably likely to have a Material Adverse Effect with
        respect to it.
 
     (h) Litigation; Regulatory Action. (i) Other than as set forth in its
Regulatory Documents filed on or before the date hereof, no litigation, claim or
other proceeding before any Governmental Authority is pending against Ahmanson
or any of its Subsidiaries and, to the best of Ahmanson's knowledge, no such
litigation, claim or other proceeding has been threatened.
 
             (ii) Neither Ahmanson nor any of its Subsidiaries or properties is
        a party to or is subject to any order, decree, agreement, memorandum of
        understanding or similar arrangement with, or a
 
                                      A-19
<PAGE>   108
 
        commitment letter or similar submission to, or extraordinary supervisory
        letter from a Regulatory Authority, nor has Ahmanson or any of its
        Subsidiaries been advised by a Regulatory Authority that such agency is
        contemplating issuing or requesting (or is considering the
        appropriateness of issuing or requesting) any such order, decree,
        agreement, memorandum of understanding, commitment letter, supervisory
        letter or similar submission.
 
     (i) Compliance with Laws. Ahmanson and each of its Subsidiaries:
 
          (i) is in compliance with all applicable federal, state, local and
     foreign statutes, laws, regulations, ordinances, rules, judgments, orders
     or decrees applicable thereto or to the employees conducting such
     businesses, including, without limitation, the Equal Credit Opportunity
     Act, the Fair Housing Act, the Community Reinvestment Act, the Home
     Mortgage Disclosure Act and all other applicable fair lending laws and
     other laws relating to discriminatory business practices;
 
             (ii) has all permits, licenses, authorizations, orders and
        approvals of, and has made all filings, applications and registrations
        with, all Governmental Authorities that are required in order to permit
        them to conduct their businesses substantially as presently conducted;
        all such permits, licenses, certificates of authority, orders and
        approvals are in full force and effect and, to the best of its
        knowledge, no suspension or cancellation of any of them is threatened;
        and
 
             (iii) has received, since December 31, 1996, no notification or
        communication from any Governmental Authority (A) asserting that
        Ahmanson or any of its Subsidiaries is not in compliance with any of the
        statues, regulations, or ordinances which such Governmental Authority
        enforces or (B) threatening to revoke any license, franchise, permit, or
        governmental authorization (nor, to Ahmanson's knowledge, do any grounds
        for any of the foregoing exist).
 
          (j) No Brokers. No action has been taken by Ahmanson that would give
     rise to any valid claim against any party hereto for a brokerage
     commission, finder's fee or other like payment with respect to the
     transactions contemplated by this Agreement, excluding a fee to be paid to
     Merrill Lynch, Pierce, Fenner & Smith Incorporated.
 
          (k) Tax Matters. As of the date hereof, neither Ahmanson nor any of
     its Subsidiaries has any reason to believe that any conditions exist that
     might prevent or impede the Merger from qualifying as a reorganization
     within the meaning of Section 368 of the Code, or otherwise prevent the
     conditions in Section 7.03 from being met.
 
          (l) Disclosure. The representations and warranties contained in this
     Section 5.04 do not contain any untrue statement of a material fact or omit
     to state any material fact necessary in order to make the statements and
     information contained in this Section 5.04 not misleading.
 
                                   ARTICLE VI
 
                                   COVENANTS
 
     6.01  Reasonable Best Efforts. Subject to the terms and conditions of this
Agreement, each of Coast and Ahmanson agrees to use its reasonable best efforts
in good faith to take, or cause to be taken, all actions, and to do, or cause to
be done, all things necessary, proper or desirable, or advisable under
applicable laws, so as to permit consummation of the Merger as promptly as
practicable and otherwise to enable consummation of the transactions
contemplated hereby and shall cooperate fully with the other party hereto to
that end.
 
     6.02  Stockholder Approval. Coast agrees to take in accordance with
applicable law and its certificate of incorporation and by-laws all action
necessary to convene a meeting of its stockholders to consider and vote upon the
approval and adoption of this Agreement and the transactions contemplated hereby
(including the approval of the establishment of the CPR Trust, the engagement of
the Litigation Trustees (including the terms of their engagement) and the terms
of the Commitment and the rights of holders of Trust Certificates) and any other
matters required to be approved by Coast's stockholders for consummation of the
Merger (including any adjournment or postponement, the "Coast Meeting"), as
promptly as practicable after the
 
                                      A-20
<PAGE>   109
 
Registration Statements are declared effective. Subject to the proviso in the
first sentence of Section 6.06, the Coast Board shall recommend such approval,
and Coast shall take all reasonable, lawful action to solicit such approval by
its stockholders.
 
     6.03 Registration Statements. (a) Ahmanson agrees to prepare a registration
statement on Form S-4 or other applicable form (the "Ahmanson Registration
Statement") to be filed by Ahmanson with the SEC in connection with the issuance
of Ahmanson Common Stock in the Merger (including the proxy statement and
prospectus and other proxy solicitation materials of Coast constituting a part
thereof (the "Proxy Statement") and all related documents). Coast agrees to
cooperate, and to cause its Subsidiaries to cooperate, with Ahmanson, its
counsel and its accountants, in the preparation of the Ahmanson Registration
Statement and the Proxy Statement; and Coast agrees to file the Proxy Statement
in preliminary form with the SEC as promptly as reasonably practicable, and
Ahmanson agrees to file the Ahmanson Registration Statement with the SEC as soon
as reasonably practicable after any SEC comments with respect to the preliminary
Proxy Statement are resolved. Each of Coast and Ahmanson agrees to use all
reasonable efforts to cause the Ahmanson Registration Statement to be declared
effective under the Securities Act as promptly as reasonably practicable after
filing thereof. Ahmanson also agrees to use all reasonable efforts to obtain all
necessary state securities law or "Blue Sky" permits and approvals required to
carry out the transactions contemplated by this Agreement. Coast agrees to
furnish to Ahmanson all information concerning Coast, its Subsidiaries,
officers, directors and stockholders as may be reasonably requested in
connection with the foregoing. Coast agrees to prepare a registration statement
on Form S-1 or other applicable form (the "CPR Trust Registration Statement"
and, together with the Ahmanson Registration Statement, the "Registration
Statements") to be filed by the CPR Trust with the SEC in connection with the
distribution of the CPR Certificates (including the prospectus constituting a
part thereof (the "CPR Prospectus") and all related documents). Coast agrees to
cause the CPR Trust Registration Statement to be filed with the SEC as soon as
reasonably practicable after the date hereof. Coast agrees to use all reasonable
efforts to cause the CPR Trust Registration Statement to be declared effective
under the Securities Act as promptly as reasonably practicable after filing
thereof and to cause the Trust Agreement to be qualified under the Trust
Indenture Act. Coast also agrees to use all reasonable efforts to obtain all
necessary state securities law or "Blue Sky" permits and approvals required to
carry out the distribution of the CPR Certificates by Coast. Ahmanson agrees to
furnish to Coast all information concerning Ahmanson, its Subsidiaries,
officers, directors and stockholders as may be reasonably requested in
connection with the foregoing.
 
          (b) Each of Coast and Ahmanson agrees, as to itself and its
     Subsidiaries, that none of the information supplied or to be supplied by it
     for inclusion or incorporation by reference in the Registration Statements
     will, at the time the Registration Statements and each amendment or
     supplement thereto, if any, becomes effective under the Securities Act,
     contain any untrue statement of a material fact or omit to state any
     material fact required to be stated therein or necessary to make the
     statements therein not misleading, the Proxy Statement and any amendment or
     supplement thereto will, at the date of mailing to stockholders and at the
     time of the Coast Meeting contain any untrue statement of a material fact
     or omit to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading or any statement
     which, in the light of the circumstances under which such statement is
     made, will be false or misleading with respect to any material fact, or
     which will omit to state any material fact necessary in order to make the
     statements therein not false or misleading or necessary to correct any
     statement in any earlier statement in the Proxy Statement or any amendment
     or supplement thereto and the CPR Prospectus and any amendment or
     supplement thereto will, as of its date, contain any untrue statement of a
     material fact or omit to state any material fact required to be stated
     therein or necessary to make the statements therein not misleading or any
     statement which, in the light of the circumstances under which such
     statement is made, will be false or misleading with respect to any material
     fact, or which will omit to state any material fact necessary in order to
     make the statements therein not false or misleading or necessary to correct
     any statement in any earlier statement in the CPR Prospectus or any
     amendment or supplement thereto. Each of Coast and Ahmanson further agrees
     that if it shall become aware prior to the Effective Date of any
     information furnished by it that would cause any of the statements in the
     Proxy Statement, CPR Prospectus, CPR Trust Registration Statement or
     Ahmanson Registration Statement to be false or misleading with respect to
     any material fact, or to omit
 
                                      A-21
<PAGE>   110
 
     to state any material fact necessary to make the statements therein not
     false or misleading, to promptly inform the other party thereof and to take
     the necessary steps to correct the Proxy Statement, CPR Prospectus, CPR
     Trust Registration Statement or the Ahmanson Registration Statement.
 
          (c) Each of Ahmanson and Coast agrees to advise the other party,
     promptly after Ahmanson or Coast, as the case may be, receives notice
     thereof, of the time when the Ahmanson Registration Statement or the CPR
     Trust Registration Statement, as the case may be, has become effective or
     any supplement or amendment has been filed, of the issuance of any stop
     order or the suspension of the qualification of Ahmanson Common Stock or
     the CPR Certificates as the case may be, for offering or sale in any
     jurisdiction, of the initiation or threat of any proceeding for any such
     purpose, or of any request by the SEC for the amendment or supplement of
     the Ahmanson Registration Statement or the CPR Trust Registration
     Statement, as the case may be, or for additional information.
 
     6.04  Press Releases. Each of Coast and Ahmanson agrees that it will not,
without prior consultation with the other party, issue any press release or
written statement for general circulation relating to the transactions
contemplated hereby, except as otherwise required by applicable law or
regulation or NYSE rules. Each of Ahmanson and Coast will agree upon the joint
initial press release made with respect to the transactions contemplated hereby.
 
     6.05  Access; Information. (a) Each of Coast and Ahmanson agrees that upon
reasonable notice and subject to applicable laws relating to the exchange of
information, it shall afford the other party and the other party's officers,
employees, counsel, accountants and other authorized representatives, such
access during normal business hours throughout the period prior to the Effective
Time to the books, records (including, without limitation, tax returns and work
papers of independent auditors), properties, personnel and to such other
information as any party may reasonably request and, during such period, it
shall furnish promptly to such other party (i) a copy of each material report,
schedule and other document filed by it pursuant to the requirements of federal
or state securities or banking laws, and (ii) all other information concerning
the business, properties and personnel of it as the other may reasonably
request.
 
          (b) Each agrees that it will not, and will cause its representatives
     not to, use any information obtained pursuant to this Section 6.05 (as well
     as any other information obtained prior to the date hereof in connection
     with the entering into of this Agreement) for any purpose unrelated to the
     consummation of the transactions contemplated by this Agreement. Subject to
     the requirements of law, each party will keep confidential, and will cause
     its representatives to keep confidential, all information and documents
     obtained pursuant to this Section 6.05 (as well as any other information
     obtained prior to the date hereof in connection with the entering into of
     this Agreement) unless such information (i) was already known to such
     party, (ii) becomes available to such party from other sources not known by
     such party to be bound by a confidentiality obligation, (iii) is disclosed
     with the prior written approval of the party to which such information
     pertains or (iv) is or becomes readily ascertainable from published
     information or trade sources. In the event that this Agreement is
     terminated or the transactions contemplated by this Agreement shall
     otherwise fail to be consummated, each party shall promptly cause all
     copies of documents or extracts thereof containing information and data as
     to another party hereto to be returned to the party which furnished the
     same (or confirm in writing that all such copies have been destroyed). No
     investigation by either party of the business and affairs of the other
     shall affect or be deemed to modify or waive any representation, warranty,
     covenant or agreement in this Agreement, or the conditions to either
     party's obligation to consummate the transactions contemplated by this
     Agreement.
 
          (c) Except as contemplated by this Agreement and following termination
     of this Agreement, each party hereto agrees that for two years from
     September 18, 1997 it (and its affiliates) will not, alone or with others,
     in any manner, (a) acquire, agree to acquire, or make any offer or proposal
     (other than a confidential request to the Chairman of the Board for
     permission to make an offer or proposal) to acquire beneficial ownership of
     any securities or material properties of the other party (and its
     Subsidiaries), unless such acquisition or agreement or the making of such
     offer or proposal, shall have been expressly first approved by the other
     party's Board of Directors or (b) solicit proxies from stockholders of the
     other party.
 
                                      A-22
<PAGE>   111
 
     6.06  Acquisition Proposals. Coast agrees that it shall not, and shall
cause its Subsidiaries and its and its Subsidiaries' officers, directors,
agents, advisors and affiliates not to, solicit or encourage inquiries or
proposals with respect to, or engage in any negotiations concerning, or provide
any confidential information to, or have any discussions with, any person
relating to, any Acquisition Proposal or waive any provision of or amend the
terms of the Coast Rights Agreement in respect of an Acquisition Proposal;
provided, however, that nothing in this Agreement shall (x) require the Coast
Board to recommend stockholder approval of the Merger following an Acquisition
Proposal, (y) prevent Coast or the Coast Board from (i) engaging in any
discussions or negotiations with, or providing any information to, any Person in
response to an unsolicited bona fide written Acquisition Proposal by any such
Person or (ii) recommending such an unsolicited bona fide written Acquisition
Proposal to the holders of Coast Common Stock or (z) prevent Coast from waiving
any provision of or amending the terms of the Coast Rights Agreement in respect
of an Acquisition Proposal, if and only if, with respect to the actions
described in clause (x), (y) or (z), as applicable, (A) the Coast Board
concludes in good faith that the Acquisition Proposal, if consummated, would
result in a transaction more favorable to holders of Coast Common Stock than the
transaction contemplated by this Agreement; (B) the Coast Board determines in
good faith based upon the advice of outside counsel that such action is legally
necessary for it to act in a manner consistent with its fiduciary duties under
applicable law; and (C) prior to providing any information or data to any person
or entering into discussions or negotiations with any Person, the Coast Board
notifies Ahmanson immediately of such inquiries, proposals or offers received
by, any such information requested from, or any such discussions or negotiations
sought to be initiated or continued with Coast or any Subsidiary thereof. Coast
shall immediately cease and cause to be terminated any activities, discussions
or negotiations conducted prior to the date of this Agreement with any parties
other than Ahmanson with respect to any of the foregoing and shall use its
reasonable best efforts to enforce any confidentiality or similar agreement
relating to an Acquisition Proposal. Coast shall promptly (within 24 hours)
advise Ahmanson following the receipt by Coast of any Acquisition Proposal and
the substance thereof (including the identity of the person making such
Acquisition Proposal), and advise Ahmanson of any developments with respect to
such Acquisition Proposal immediately upon the occurrence thereof.
 
     6.07  Affiliate Agreements. (a) Not later than the 15th day prior to the
mailing of the Proxy Statement, Coast shall deliver to Ahmanson a schedule of
each person that, to the best of its knowledge, is or is reasonably likely to
be, as of the date of the Coast Meeting, deemed to be an "affiliate" of Coast
(each, a "Coast Affiliate") as that term is used in Rule 145 under the
Securities Act or SEC Accounting Series Releases 130 and 135.
 
          (b) Coast shall use its reasonable best efforts to cause each person
     who may be deemed to be a Coast Affiliate to execute and deliver to
     Ahmanson on or before the date of mailing of the Proxy Statement an
     agreement in the form attached hereto as Exhibit A.
 
     6.08  Takeover Laws. No party hereto shall take any action that would cause
the transactions contemplated by this Agreement to be subject to requirements
imposed by any Takeover Law and each of them shall take all necessary steps
within its control to exempt (or ensure the continued exemption of) the
transactions contemplated by this Agreement from, or if necessary challenge the
validity or applicability of, any applicable Takeover Law, as now or hereafter
in effect.
 
     6.09  Certain Policies. Prior to the Effective Date, Coast shall,
consistent with generally accepted accounting principles and on a basis mutually
satisfactory to it and Ahmanson, modify and change its loan, litigation and real
estate valuation policies and practices (including loan classifications and
levels of reserves) so as to be applied on a basis that is consistent with that
of Ahmanson; provided, however, that Coast shall not be obligated to take any
such action pursuant to this Section 6.09 unless and until Ahmanson acknowledges
that all conditions to its obligation to consummate the Merger have been
satisfied.
 
     6.10  NYSE Listing. Ahmanson agrees to use its reasonable best efforts to
list, prior to the Effective Date, on the NYSE, subject to official notice of
issuance, the shares of Ahmanson Common Stock to be issued to the holders of
Coast Common Stock in the Merger.
 
     6.11  Regulatory Applications. (a) Ahmanson and Coast and their respective
Subsidiaries shall cooperate and use their respective reasonable best efforts to
prepare all documentation, to effect all filings and
 
                                      A-23
<PAGE>   112
 
to obtain all permits, consents, approvals and authorizations of all third
parties and Governmental Authorities necessary to consummate the transactions
contemplated by this Agreement. Each of Ahmanson and Coast shall have the right
to review in advance, and to the extent practicable each will consult with the
other, in each case subject to applicable laws relating to the exchange of
information, with respect to all material written information submitted to any
third party or any Governmental Authority in connection with the transactions
contemplated by this Agreement. In exercising the foregoing right, each of the
parties hereto agrees to act reasonably and as promptly as practicable. Each
party hereto agrees that it will consult with the other party hereto with
respect to the obtaining of all material permits, consents, approvals and
authorizations of all third parties and Governmental Authorities necessary or
advisable to consummate the transactions contemplated by this Agreement and each
party will keep the other party appraised of the status of material matters
relating to completion of the transactions contemplated hereby.
 
          (b) Each party agrees, upon request, to furnish the other party with
     all information concerning itself, its Subsidiaries, directors, officers
     and stockholders and such other matters as may be reasonably necessary or
     advisable in connection with any filing, notice or application made by or
     on behalf of such other party or any of its Subsidiaries to any third party
     or Governmental Authority.
 
     6.12  Indemnification. (a) Following the Effective Date, Ahmanson shall
indemnify, defend and hold harmless the present directors and officers of Coast
and its Subsidiaries (each, an "Indemnified Party") against all costs or
expenses (including reasonable attorneys' fees), judgments, fines, losses,
claims, damages or liabilities (collectively, "Costs") as incurred, in
connection with any claim, action, suit, proceeding or investigation, whether
civil, criminal, administrative or investigative, arising out of actions or
omissions occurring at or prior to the Effective Time (including, without
limitation, the transactions contemplated by this Agreement) to the fullest
extent that Coast is permitted to indemnify (and advance expenses to) its
directors and officers under the laws of the State of Delaware, the Coast
Certificate and the Coast By-Laws as in effect on the date hereof; provided that
any determination required to be made with respect to whether an officer's or
director's conduct complies with the standards set forth under Delaware law, the
Coast Certificate and the Coast By-Laws shall be made by independent counsel
(which shall not be counsel that provides material services to Ahmanson)
selected by Ahmanson and reasonably acceptable to such officer or director.
 
          (b) For a period of four years from the Effective Time, Ahmanson shall
     use its reasonable best efforts to provide that portion of director's and
     officer's liability insurance that serves to reimburse the present and
     former officers and directors of Coast or any of its Subsidiaries
     (determined as of the Effective Time) (as opposed to Coast) with respect to
     claims against such directors and officers arising from facts or events
     occurring at or prior to the Effective Time (including the transactions
     contemplated by this Agreement) which insurance shall contain at least the
     same coverage and amounts, and contain terms and conditions no less
     advantageous, as that coverage currently provided by Coast; provided,
     however, that in no event shall Ahmanson be required to expend more than
     200% of the Previously Disclosed current amount expended by Coast (the
     "Insurance Amount") to maintain or procure such directors and officers
     insurance coverage; provided, further, that if Ahmanson is unable to
     maintain or obtain the insurance called for by this Section 6.12(b),
     Ahmanson shall use its reasonable best efforts to obtain as much comparable
     insurance as is available for the Insurance Amount; provided, further, that
     officers and directors of Coast or any Subsidiary may be required to make
     application and provide customary representations and warranties to
     Ahmanson's insurance carrier for the purpose of obtaining such insurance.
 
          (c) Any Indemnified Party wishing to claim indemnification under
     Section 6.12(a), upon learning of any claim, action, suit, proceeding or
     investigation described above, shall promptly notify Ahmanson thereof;
     provided that the failure so to notify shall not affect the obligations of
     Ahmanson under Section 6.12(a) unless and to the extent that Ahmanson is
     actually prejudiced as a result of such failure.
 
          (d) If Ahmanson or any of its successors or assigns shall consolidate
     with or merge into any other entity and shall not be the continuing or
     surviving entity of such consolidation or merger or shall transfer all or
     substantially all of its assets to any other entity, then and in each case,
     Ahmanson shall cause proper
 
                                      A-24
<PAGE>   113
 
     provision to be made so that the successors and assigns of Ahmanson shall
     assume the obligations set forth in this Section 6.12.
 
          (e) The provisions of this Section 6.12 are intended to be for the
     benefit of, and shall be enforceable by, each Indemnified Party and his or
     her heirs and representatives.
 
     6.13  Benefit Plan; Retention Bonuses. (a) Ahmanson shall, from and after
the Effective Time, (i) honor in accordance with their terms all employment or
severance agreements entered into prior to the date hereof and Previously
Disclosed, (ii) provide former employees of Coast who remain as employees of
Ahmanson with employee benefit plans no less favorable in the aggregate than
those provided to similarly situated employees of Ahmanson, (iii) provide
employees of Coast who remain as employees of Ahmanson credit for years of
service with Coast or any of its subsidiaries prior to the Effective Time for
the purpose of eligibility and vesting and (iv) cause any and all pre-existing
condition limitations (to the extent such limitations did not apply to a
pre-existing condition under comparable Compensation and Benefit Plans) and
eligibility waiting periods under group health plans of Ahmanson to be waived
with respect to former employees of Coast who remain as employees of Ahmanson
(and their eligible dependents) and who become participants in such group health
plans. Nothing in this Agreement shall limit or restrict the right of Ahmanson
to (A) terminate the employment of any employee at any time for any reason
whatsoever, with or without cause, and (B) modify, amend or terminate any
employee benefit or other plans of Ahmanson. Ahmanson acknowledges that the
Merger constitutes a change in control under the terms of the plans and
agreements listed in Coast's Disclosure Schedule under the heading "Disclosures
with respect to Section 5.03(m)(i): Employee Benefit Plans."
 
          (b) Prior to the Effective Time, Coast may agree to pay up to
     $2,000,000 as retention bonuses, payable upon the day 180 days following
     the Effective Date or on such earlier day as Ahmanson may determine or upon
     the earlier termination of the applicable employee by Ahmanson without
     cause, and to be allocated primarily among non-executive employees of
     Coast. The allocation of all such payments shall be determined in
     consultation with Ahmanson and shall be subject to the approval of Ahmanson
     in its sole discretion.
 
     6.14  Accountants' Letters. Each of Coast and Ahmanson shall use its
reasonable best efforts to cause to be delivered to the other party, and to
Ahmanson's directors and officers who sign the Registration Statement, a letter
of KPMG Peat Marwick LLP, independent auditors for each of Coast and Ahmanson,
dated (i) the date on which the Registration Statement shall become effective
and (ii) a date shortly prior to the Effective Date, and addressed to such other
party, and such directors and officers, in form and substance customary for
"comfort" letters delivered by independent accountants in accordance with
Statement of Accounting Standards No. 72.
 
     6.15  Notification of Certain Matters. Each of Coast and Ahmanson shall
give prompt notice to the other of any fact, event or circumstance known to it
that (i) is reasonably likely, individually or taken together with all other
facts, events and circumstances known to it, to result in any Material Adverse
Effect with respect to it or (ii) would cause or constitute a material breach of
any of its representations, warranties, covenants or agreements contained
herein.
 
     6.16  Officers and Directors. Ahmanson agrees to cause Mr. Ray Martin to be
elected or appointed as a director of Ahmanson at, or as promptly as practicable
after, the Effective Time. Coast shall cause such executive officers and
directors of Coast Federal as Ahmanson shall specify in writing to cease to be
executive officers and directors of Coast Federal prior to the Effective Date.
 
     6.17  CPR Trust. Coast agrees to take all actions necessary to cause the
CPR Trust to be formed. In addition, Coast agrees to take all actions necessary
to cause the issuance of the CPR Certificates by the CPR Trust to Coast and to
distribute such CPR Certificates to the stockholders of Coast with a record date
and payment date on the Effective Date immediately prior to the Effective Time;
provided, however, that Coast shall not be required to cause the CPR Trust to
issue such CPR Certificates or be required to so distribute the CPR Certificates
until all conditions to the Merger, other than such distribution, have been
satisfied or waived. Except as set forth in this Section, the terms of the CPR
Trust and the CPR Certificates shall be as set forth
 
                                      A-25
<PAGE>   114
 
in Annex I. Coast agrees to cause the CPR Trust immediately prior to the
Effective Time to deliver to Coast a number of CPR Certificates sufficient for
the delivery of CPR Certificates required pursuant to Section 3.06. Ahmanson
agrees to return to the CPR Trust any CPR Certificates with respect to
Replacement Options that expire prior to exercise.
 
                                  ARTICLE VII
 
                    CONDITIONS TO CONSUMMATION OF THE MERGER
 
     7.01  Conditions to Each Party's Obligation to Effect the Merger. The
respective obligation of each of Ahmanson and Coast to consummate the Merger is
subject to the fulfillment or written waiver by Ahmanson and Coast prior to the
Effective Time of each of the following conditions:
 
          (a) Stockholder Approvals. This Agreement and the transactions
     contemplated hereby (including the approval of the establishment of the CPR
     Trust, the engagement of the Litigation Trustees (including their terms of
     engagement) and the terms of the Commitment and the rights of holders of
     Trust Certificates) and the Merger shall have been duly adopted by the
     requisite vote of the stockholders of Coast.
 
          (b) Regulatory Approvals. All regulatory approvals required to
     consummate the transactions contemplated hereby, shall have been obtained
     and shall remain in full force and effect and all statutory waiting periods
     in respect thereof shall have expired and no such approvals shall contain
     any conditions, restrictions or requirements which would reasonably be
     expected to (i) following the Effective Time, have a Material Adverse
     Effect on the Surviving Corporation and its Subsidiaries taken as a whole
     or (ii) reduce the benefits of the transactions contemplated hereby to such
     a degree that Ahmanson would not have entered into this Agreement had such
     conditions, restrictions or requirements been known at the date hereof.
 
          (c) No Injunction. No Governmental Authority of competent jurisdiction
     shall have enacted, issued, promulgated, enforced or entered any statute,
     rule, regulation, judgment, decree, injunction or other order (whether
     temporary, preliminary or permanent) which is in effect and prohibits
     consummation of the transactions contemplated by this Agreement.
 
          (d) Registration Statements; Trust Indenture Act. The Registration
     Statements shall have become effective under the Securities Act and no stop
     order suspending the effectiveness of the Registration Statements shall
     have been issued and be in effect and no proceedings for that purpose shall
     have been initiated or threatened by the SEC and not withdrawn. If
     required, the Trust Agreement shall have been duly qualified under the
     Trust Indenture Act.
 
          (e) Listing. The shares of Ahmanson Common Stock to be issued in the
     Merger shall have been approved for listing on the NYSE, subject to
     official notice of issuance.
 
     7.02  Conditions to Obligation of Coast. The obligation of Coast to
consummate the Merger is also subject to the fulfillment or written waiver by
Coast prior to the Effective Time of each of the following conditions:
 
          (a) Representations and Warranties. Subject to Sections 5.01 and 5.02,
     the representations and warranties of Ahmanson set forth in this Agreement
     shall be true and correct as of the date of this Agreement and as of the
     Effective Date as though made on and as of the Effective Date (except that
     representations and warranties that by their terms speak as of the date of
     this Agreement or some other date shall be true and correct as of such
     date), and Coast shall have received a certificate, dated the Effective
     Date, signed on behalf of Ahmanson by the Chief Executive Officer and the
     Chief Financial Officer of Ahmanson to such effect.
 
          (b) Performance of Obligations of Ahmanson. Ahmanson shall have
     performed in all material respects all obligations required to be performed
     by it under this Agreement at or prior to the Effective Time, and Coast
     shall have received a certificate, dated the Effective Date, signed on
     behalf of Ahmanson by the Chief Executive Officer and the Chief Financial
     Officer of Ahmanson to such effect.
 
                                      A-26
<PAGE>   115
 
          (c) Opinion of Coast's Counsel. Coast shall have received an opinion
     of Cleary, Gottlieb, Steen & Hamilton, special counsel to Coast, dated the
     Effective Date, to the effect that, on the basis of facts, representations
     and assumptions set forth in such opinion, (A) the Merger constitutes a
     "reorganization" within the meaning of Section 368 of the Code that,
     accordingly, (i) no gain or loss will be recognized by Coast as a result of
     the Merger and (ii) no gain or loss will be recognized by a stockholder of
     Coast who receives shares of Ahmanson Common Stock in exchange for shares
     of Coast Common Stock, except (x) with respect to cash received in lieu of
     fractional share interests and (y) for gain that may be recognized in an
     amount not exceeding the fair market value at the time of the Merger of
     such stockholder's CPR Certificates (which represent such stockholder's
     share of the Commitment Amount), and (B) the CPR Trust will not itself be
     subject to any material federal income taxes. In rendering its opinion,
     such counsel may require and rely upon representations contained in letters
     from Coast, Ahmanson and stockholders of Coast. The foregoing opinion will
     not apply to stockholders or persons receiving Ahmanson Common Stock or CPR
     Certificates as compensation.
 
          (d) Accountants' Letters. Coast and Mr. Martin shall have received the
     letters referred to in Section 6.14 from KPMG Peat Marwick LLP, Ahmanson's
     independent auditors.
 
          (e) Commitment. Ahmanson shall have executed and delivered the
     Commitment and made the transfer to the CPR Trust with respect to the
     Expense Fund.
 
     7.03  Conditions to Obligation of Ahmanson. The obligation of Ahmanson to
consummate the Merger is also subject to the fulfillment or written waiver by
Ahmanson prior to the Effective Time of each of the following conditions:
 
          (a) Representations and Warranties. The representations and warranties
     of Coast set forth in this Agreement shall be true and correct as of the
     date of this Agreement and as of the Effective Date as though made on and
     as of the Effective Date (except that representations and warranties that
     by their terms speak as of the date of this Agreement or some other date
     shall be true and correct as of such date) and Ahmanson shall have received
     a certificate, dated the Effective Date, signed on behalf of Coast by the
     Chief Executive Officer and the Chief Financial Officer of Coast to such
     effect.
 
          (b) Performance of Obligations of Coast. Coast shall have performed in
     all material respects all obligations required to be performed by it under
     this Agreement at or prior to the Effective Time, and Ahmanson shall have
     received a certificate, dated the Effective Date, signed on behalf of Coast
     by the Chief Executive Officer and the Chief Financial Officer of Coast to
     such effect.
 
          (c) Opinion of Ahmanson's Counsel. Ahmanson shall have received an
     opinion of Sullivan & Cromwell, special counsel to Ahmanson, dated the
     Effective Date, to the effect that, on the basis of facts, representations
     and assumptions set forth in such opinion, the Merger constitutes a
     reorganization under Section 368(a)(1)(A) of the Code and no gain or income
     will be recognized by Ahmanson in the Merger. In rendering its opinion,
     Sullivan & Cromwell may require and rely upon representations contained in
     letters from Coast, Ahmanson and stockholders of Coast.
 
          (d) Accountants' Letters. Ahmanson and its directors and officers who
     sign the Registration Statement shall have received the letters referred to
     in Section 6.14 from KPMG Peat Marwick LLP, Coast's independent auditors.
 
          (e) Dissenters' Shares. Holders of no more than 5% of the outstanding
     shares of Coast Common Stock shall have given notice that their shares of
     Coast Common Stock be treated as Dissenters' Shares.
 
          (f) CPR Trust. Coast shall have established the CPR Trust and shall
     have caused the CPR Trust to issue the CPR Certificates to Coast and shall
     have distributed the CPR Certificates to the stockholders of Coast as
     required by Section 6.17 hereof.
 
                                      A-27
<PAGE>   116
 
                                  ARTICLE VIII
 
                                  TERMINATION
 
     8.01  Termination. This Agreement may be terminated, and the Acquisition
may be abandoned:
 
          (a) Mutual Consent. At any time prior to the Effective Time, by the
     mutual consent of Ahmanson and Coast, if the Board of Directors of each so
     determines by vote of a majority of the members of its entire Board.
 
          (b) Breach. At any time prior to the Effective Time, by Ahmanson or
     Coast, if its Board of Directors so determines by vote of a majority of the
     members of its entire Board, in the event of either: (i) a breach by the
     other party of any representation or warranty contained herein (subject if
     applicable to the standard set forth in Section 5.02), which breach cannot
     be or has not been cured within 20 calendar days after the giving of
     written notice to the breaching party of such breach; or (ii) a breach by
     the other party of any of the covenants or agreements contained herein,
     which breach cannot be or has not been cured within 20 calendar days after
     the giving of written notice to the breaching party of such breach,
     provided that such breach (whether under (i) or (ii)) would be reasonably
     likely, individually or in the aggregate with other breaches, to result in
     a Material Adverse Effect.
 
          (c) Delay. At any time prior to the Effective Time, by Ahmanson or
     Coast, if its Board of Directors so determines by vote of a majority of the
     members of its entire Board, in the event that the Merger is not
     consummated by June 30, 1998, except to the extent that the failure of the
     Merger then to be consummated arises out of or results from the knowing
     action or inaction of the party seeking to terminate pursuant to this
     Section 8.01(c), which action or inaction is in violation of its
     obligations under this Agreement.
 
          (d) No Approval. By Coast or Ahmanson, if its Board of Directors so
     determines by a vote of a majority of the members of its entire Board, in
     the event (i) the approval of any Governmental Authority required for
     consummation of the Merger and the other transactions contemplated by this
     Agreement shall have been denied by final nonappealable action of such
     Governmental Authority or (ii) the stockholder approval required by Section
     7.01(a) herein is not obtained at the Coast Meeting.
 
          (e) Failure to Recommend, Etc. At any time prior to the Coast Meeting,
     by Ahmanson if the Coast Board shall have failed to make its recommendation
     referred to in Section 6.02, withdrawn such recommendation or modified or
     changed such recommendation in a manner adverse in any respect to the
     interests of Ahmanson.
 
     8.02  Effect of Termination and Abandonment. (a) In the event of
termination of this Agreement and the abandonment of the Merger pursuant to this
Article VIII, subject to the provisions of Section 8.02(b), no party to this
Agreement shall have any liability or further obligation to any other party
hereunder except that termination will not relieve a breaching party from
liability for any breach of this Agreement giving rise to such termination.
 
          (b) If (a) this Agreement shall be terminated (i) by Ahmanson pursuant
     to Section 8.01(b) or Section 8.01(e) and, at the time of the occurrence of
     the circumstance permitting termination pursuant to such Section, there
     shall exist an Acquisition Proposal with respect to Coast or any of its
     Subsidiaries, or (ii) by Coast pursuant to Section 8.01(d)(ii) and, at the
     time of the occurrence of the circumstance permitting termination pursuant
     to such Section, there shall exist an Acquisition Proposal with respect to
     Coast or any of its Subsidiaries, and (b) within 12 months after any such
     termination Coast or any of its Subsidiaries enters into a definitive
     agreement with respect to an Acquisition Proposal, Coast shall promptly pay
     to Ahmanson a termination fee equal to $35 million.
 
                                      A-28
<PAGE>   117
 
                                   ARTICLE IX
 
                                 MISCELLANEOUS
 
     9.01  Survival. No representations, warranties, agreements and covenants
contained in this Agreement shall survive the Effective Time (other than Section
6.12, the penultimate sentence of Section 6.17 and this Article IX which shall
survive the Effective Time).
 
     9.02  Waiver; Amendment. Prior to the Effective Time, any provision of this
Agreement may be (i) waived by the party benefitted by the provision, or (ii)
amended or modified at any time, by an agreement in writing between the parties
hereto executed in the same manner as this Agreement, except that after the
Coast Meeting, this Agreement may not be amended if it would violate the DGCL or
reduce the consideration to be received by Coast stockholders in the Merger.
 
     9.03  Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to constitute an original.
 
     9.04  Governing Law. This Agreement shall be governed by, and interpreted
in accordance with, the laws of the State of California applicable to contracts
made and to be performed entirely within such State (except to the extent that
mandatory provisions of Federal law or of the DGCL are applicable).
 
     9.05  Expenses. Each party hereto will bear all expenses incurred by it in
connection with this Agreement and the transactions contemplated hereby, except
that printing expenses and SEC fees shall be shared equally between Coast and
Ahmanson. Coast's expenses in connection with the transactions contemplated by
this Agreement, including without limitation fees of legal counsel and financial
advisors (but excluding expenses of any litigation relating to the transactions
contemplated by this Agreement, printing and mailing expenses, SEC and Blue Sky
filing fees and accountants' fees) shall not exceed the amounts set forth in
paragraph 9.05 of Coast's Disclosure Schedule.
 
     9.06  Notices. All notices, requests and other communications hereunder to
a party shall be in writing and shall be deemed given if personally delivered,
telecopied (with confirmation) or mailed by registered or certified mail (return
receipt requested) to such party at its address set forth below or such other
address as such party may specify by notice to the parties hereto.
 
     If to Coast, to:
 
       Coast Savings Financial, Inc.
        1000 Wilshire Boulevard
        Los Angeles, California 90017-2457
        Attention: Ray Martin
        Facsimile: (213) 688-0837
 
     With copies to:
 
       Cleary, Gottlieb, Steen & Hamilton
        One Liberty Plaza
        New York, New York 10006
        Attention: Victor Lewkow
        Facsimile: (212) 225-3999
 
        and
 
        Mayer, Brown & Platt
        350 South Grand Avenue
        Los Angeles, California 90017-1503
        Attention: James R. Walther
        Facsimile: (213) 625-0248
 
                                      A-29
<PAGE>   118
 
     If to Ahmanson, to:
 
       H. F. Ahmanson & Company
        4900 Rivergrade Road
        Irwindale, California 91706
        Attention: Madeleine Kleiner
        Facsimile: (626) 814-6750
 
     With a copy to:
 
       Sullivan & Cromwell
        444 S. Flower Street, 12th Floor
        Los Angeles, California 90071
        Attention: Alison S. Ressler
        Facsimile: (213) 683-0457
 
     9.07  Entire Understanding; No Third Party Beneficiaries. This Agreement,
including the Exhibits, Schedules and Annexes to this Agreement represents the
entire understanding of the parties hereto with reference to the transactions
contemplated hereby and thereby and this Agreement supersedes any and all other
oral or written agreements heretofore made prior to October 5, 1997. Except for
Section 6.12, nothing in this Agreement expressed or implied is intended to
confer upon any person, other than the parties hereto or their respective
successors, any rights, remedies, obligations or liabilities under or by reason
of this Agreement.
 
     9.08  Interpretation; Effect. When a reference is made in this Agreement to
Sections, Exhibits, Schedules or Annexes, such reference shall be to a Section
of, or Exhibit, Schedule or Annex to, this Agreement unless otherwise indicated.
The table of contents and headings contained in this Agreement are for reference
purposes only and are not part of this Agreement. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation." No provision of this Agreement shall
be construed to require Coast, Ahmanson or any of their respective Subsidiaries,
affiliates or directors to take any action or omit to take any action which
action or omission would violate applicable law (whether statutory or common
law), rule or regulation.
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in counterparts by their duly authorized officers, all as of the day
and year first above written.
 
                                          COAST SAVINGS FINANCIAL, INC.
 
                                          By:        /s/ RAY MARTIN
                                            ------------------------------------
                                            Name: Ray Martin
                                            Title: Chairman and Chief Executive
                                              Officer
 
                                          H. F. AHMANSON & COMPANY
 
                                          By:   /s/ MADELEINE A. KLEINER
                                            ------------------------------------
   
                                            Name: Madeleine A. Kleiner
    
   
                                            Title: Senior Executive Vice
                                              President and
    
   
                                                 Chief Administrative Officer
    
 
                                      A-30
<PAGE>   119
 
   
                                                                      APPENDIX C
    
 
   
     COMMITMENT AGREEMENT, dated as of             , 1998 (this "Agreement"), by
and between H. F. Ahmanson & Company, a Delaware corporation ("Ahmanson"), and
the Coast Federal Litigation Contingent Payment Right Trust (the "CPR Trust"), a
Delaware business trust (the "CPR Trust").
    
 
   
                                    RECITALS
    
 
   
     WHEREAS, Ahmanson has entered into an Amended and Restated Agreement and
Plan of Merger, dated as of October 5, 1997 (the "Merger Agreement"), by and
between Ahmanson and Coast Savings Financial, Inc. ("Coast");
    
 
   
     WHEREAS, prior to or simultaneously with the execution of this Agreement,
Ahmanson will have deposited or will deposit the Expense Fund in a non-interest
bearing demand-deposit account in the name of the CPR Trust at Home Savings; and
    
 
   
     WHEREAS, pursuant to the Merger Agreement, Ahmanson has agreed to enter
into this Agreement;
    
 
   
     NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein the parties agree as follows:
    
 
   
                                   ARTICLE I
    
 
   
                              CERTAIN DEFINITIONS
    
 
   
     1.01  Certain Definitions. (a) The following terms are used in this
Agreement with the meanings set forth below:
    
 
   
          "Accountant" has the meaning set forth in Section 2.02 hereof.
    
 
   
          "Ahmanson" has the meaning set forth in the preamble to this
     Agreement.
    
 
   
          "Ahmanson Certificate" has the meaning set forth in Section 2.02
     hereof.
    
 
   
          "Ahmanson Group" means Ahmanson, Coast Federal or Home Savings or any
     of their affiliates.
    
 
   
          "Ahmanson Indemnified Parties" has the meaning set forth in Section
     2.07 hereof.
    
 
   
          "Assumed Tax Benefit" means an amount equal to the tax benefit that
     would be allowed to the Ahmanson Group under Section 483(a) computed as set
     forth in Section 2.03 hereof.
    
 
   
          "Assumed Tax Liability" means an amount equal to the income (including
     franchise) tax liability of the Ahmanson Group (not giving effect to any
     deductions attributable to payments of the Commitment Amount) attributable
     to the receipt of the Litigation Proceeds computed as set forth in Section
     2.03 hereof.
    
 
   
          "Cash Proceeds" means any cash payment actually received by the
     Ahmanson Group pursuant to a final, nonappealable judgment or a final
     settlement of the Litigation.
    
 
   
          "Coast" has the meaning set forth in the recitals to this Agreement.
    
 
   
          "Coast Federal" means Coast Federal Bank, Federal Savings Bank.
    
 
   
          "Code" means the Internal Revenue Code of 1986, as amended.
    
 
   
          "Commitment Amount" means the Litigation Proceeds minus the
     Reimbursements plus the Assumed Tax Benefit.
    
 
   
          "Controlled Subsidiary" means any person at least 80% of the
     outstanding shares of Voting Stock (except for directors' qualifying
     shares) of which is at the time owned directly or indirectly by Ahmanson.
    
 
                                       C-1
<PAGE>   120
 
   
          "CPR Calculation Certificate" has the meaning set forth in Section
     2.02 hereof.
    
 
   
          "CPR Trust" has the meaning set forth in the preamble to this
     Agreement.
    
 
   
          "CPR Trust Agreement" means the Amended and Restated Declaration of
     Trust, dated as of             , 1998, among Coast, the Litigation Trustees
     and the other trustees named therein.
    
 
   
          "Damages" has the meaning set forth in Section 2.07 hereof.
    
 
   
          "Determination" means (a) a determination that Litigation Proceeds are
     not includible in gross income in whole or in part or (b) a determination
     that no deduction is allowed (or that any allowed deduction is limited) in
     respect of payments of the Commitment Amount under Section 483(a) in whole
     or in part. With respect to clause (a), no such Determination shall be
     deemed to be made unless it is made prior to the earlier of (x) thirty days
     before the date of filing by the Ahmanson Group of the federal tax return
     for the taxable year in which the Litigation Proceeds are assumed to be
     includible in gross income or (y) the receipt by the Ahmanson Group of the
     Litigation Proceeds. With respect to clause (b), no such Determination
     shall be deemed to be made with respect to any payment of the Commitment
     Amount unless such Determination is made prior to (A) the end of the 30th
     day following the delivery to the CPR Trust of the Ahmanson Certificate
     with respect to such payment of the Commitment Amount, if the CPR Trust
     does not deliver a Notice of Objection within such 30-day period with
     respect to such Ahmanson Certificate, or (B) the Resolution with respect to
     such payment of the Commitment Amount, if the CPR Trust delivers a Notice
     of Objection within the 30-day period referred to in clause (A) above with
     respect to such Ahmanson Certificate.
    
 
   
          "Due Date" has the meaning set forth in Section 2.02 hereof.
    
 
   
          "Expense Fund" means the $     million that Ahmanson is depositing
     simultaneously with the effectiveness of this Agreement in a non-interest
     bearing demand-deposit account in the name of the CPR Trust at Home
     Savings.
    
 
   
          "FHLBSF" means the Federal Home Loan Bank of San Francisco.
    
 
   
          "FIRREA" means the Financial Institutions Reform, Recovery and
     Enforcement Act of 1989.
    
 
   
          "Home Savings" means Home Savings of America, FSB.
    
 
   
          "IRS" means the Internal Revenue Service.
    
 
   
          "Litigation" means Coast Federal Bank, FSB v. United States, No.
     92-466C (United States Court of Claims, filed July 9, 1992).
    
 
   
          "Litigation Proceeds" means any and all Cash Proceeds and Non-Cash
     Proceeds.
    
 
   
          "Non-Cash Proceeds" means the non-cash payments, if any, actually
     received by the Ahmanson Group pursuant to a final, non-appealable judgment
     or a final settlement of the Litigation.
    
 
   
          "Notice of Agreement" has the meaning set forth in Section 2.02
     hereof.
    
 
   
          "Notice of Objection" has the meaning set forth in Section 2.02
     hereof.
    
 
   
          "Officer's Certificate" means a certificate from the chief financial
     officer of Home Savings specifying that portion of the Litigation Proceeds
     that cannot be paid due to regulatory restrictions and the applicable law,
     regulation or other action of a regulatory authority that is the source of
     the regulatory restrictions described in Section 2.03 hereof.
    
 
   
          "Opinion of Counsel" means an opinion of outside counsel substantially
     to the effect that the distribution by Home Savings of the Litigation
     Proceeds or the applicable portion thereof, as the case may be, would
     result in the violation of the applicable law, regulation or other action
     of a regulatory authority that is the source of the regulatory restrictions
     described in Section 2.03 hereof.
    
 
   
          "Proceeds Notice" has the meaning set forth in Section 2.02 hereof.
    
 
                                       C-2
<PAGE>   121
 
   
          "Reference Rate" means the reference rate or an equivalent rate
     announced from time to time of the Bank of America or any successor (or, if
     no successor remains in existence or publicly announces a rate, the
     commercial bank with the largest amount of deposits in the State of
     California as of the most recent year end prior to the applicable date for
     which information is publicly available and which publicly announces such a
     rate, as determined in good faith by Ahmanson's Board of Directors), as in
     effect from time to time.
    
 
   
          "Regulatory Document" means either (i) a copy of written documentation
     from the applicable regulatory authority to the effect that Home Savings
     may not distribute the Litigation Proceeds, or any portion thereof, to
     Ahmanson, or (ii), prior to the expiration of any applicable prior notice
     or application period following Home Savings' submission to the applicable
     regulatory authority of a notice or application for approval of a
     distribution of the Litigation Proceeds to Ahmanson, an officer's
     certificate from the chief financial officer of Home Savings certifying
     that Home Savings has submitted such a notice or application and that Home
     Savings has not received any written documentation from such regulatory
     authority to the effect that Home Savings may make such distribution.
    
 
   
          "Reimbursements" means an amount equal to (i) the Expense Fund plus
     (ii) interest on the portions of the Expense Fund withdrawn by the CPR
     Trust calculated from the time of any such withdrawal at an annual interest
     rate equal to the Reference Rate plus 250 basis points, compounded
     quarterly plus (iii) the Assumed Tax Liability plus (iv) in the event
     Litigation Proceeds are required to be included in income for federal
     income tax purposes in a taxable year prior to the year such proceeds are
     received in cash (because of either the accrual of Cash Proceeds before the
     payment thereof or the time required to liquidate Non-Cash Proceeds),
     interest at an annual interest rate equal to the Reference Rate plus 250
     basis points from the date of payment of taxes on such income to the date
     of receipt of cash.
    
 
   
          "Resolution" has the meaning set forth in Section 2.02 hereof.
    
 
   
          "Section 483(a)" means Section 483(a) of the Code.
    
 
   
          "Tax Assumptions" means (i), if there is no Determination, the
     following assumptions or (ii), if there is a Determination, the following
     assumptions as modified by such Determination:
    
 
   
             (a) The Litigation Proceeds will be includible in gross income as
        ordinary income in full.
    
 
   
             (b) Payments of the Commitment Amount will not be deductible except
        that Section 483(a) will apply to payments of the Commitment Amount,
        other than those allocable to CPR Certificates issued on exercise of
        employee options or otherwise in a transaction that is not a sale or
        exchange, and payments of the Commitment Amount will be deductible to
        the extent treated by Section 483(a) as interest expense; it being
        understood that it is not intended that the distribution of the CPR
        Certificates immediately prior to the Effective Time of the Merger will
        result in the characterization of such distribution as not constituting
        "a sale or exchange."
    
 
   
             (c) The income tax liability attributable to the assumed inclusion
        of all or a portion of the Litigation Proceeds in gross income as
        ordinary income and the benefit of any deduction assumed to be allowed
        under Section 483(a) shall be (i) the product of the amount of such
        income or deduction and the highest statutory rate of federal income tax
        applicable to corporations for the year in which the income is assumed
        to be included or the deduction is assumed to be realized plus (ii) the
        product of such income or deduction and the net combined marginal rate
        of state and local income (or franchise) tax of the relevant member or
        members of the Ahmanson Group for the year in which the income is
        assumed to be included and the deduction is assumed to be realized, net
        of the federal income tax benefit (calculated based on the rate in
        clause (i)) of such state or local income (or franchise) tax. The
        relevant member or members of the Ahmanson Group shall be the member or
        members that is or are assumed to include the Litigation Proceeds in
        income or is or are assumed to be allowed a deduction under Section
        483(a).
    
 
   
             (d) Any benefit from any deduction allowable to the Ahmanson Group
        under paragraph (c) of these assumptions for payments of the Commitment
        Amount shall be assumed to be realized (i) when those payments are made
        to the extent those payments do not exceed the Litigation
    
 
                                       C-3
<PAGE>   122
 
   
        Proceeds included in income for the same taxable year, or (ii) otherwise
        when, taking into account other deductions or losses or credits of the
        Ahmanson Group, the deduction would reduce the tax otherwise payable or
        result in a refund of tax already paid.
    
 
   
             (e) Ahmanson will be entitled to rely on a written opinion of
        either Sullivan & Cromwell or another nationally recognized law firm
        with expertise on the matter on which the opinion is sought (with a copy
        of such opinion to the Litigation Trustees) that is selected by Ahmanson
        and (unless such law firm is principal outside tax counsel to Ahmanson)
        reasonably acceptable to the Litigation Trustees in determining whether
        there has been a Determination and in otherwise applying the Tax
        Assumptions to determine the income (including franchise) tax liability
        of the Ahmanson Group attributable to the receipt of the Litigation
        Proceeds and payments of the Commitment Amount and any tax benefit
        attributable to payments of the Commitment Amount.
    
 
   
             (f) If the Assumed Tax Liability or the Assumed Tax Benefit cannot
        be computed at the time of the receipt of the Cash Proceeds or a payment
        of the Commitment Amount because of the absence of information as to tax
        rates and other factors described in the definition of Assumed Tax
        Liability or the definition of Assumed Tax Benefit, as the case may be,
        the Ahmanson Group shall compute a tentative Assumed Tax Liability or a
        tentative Assumed Tax Benefit, as the case may be, based on such
        assumptions, which are consistent with respect to the Assumed Tax
        Liability and the Assumed Tax Benefit, that in the reasonable opinion of
        the Ahmanson Group would protect the Ahmanson Group against any risk of
        loss. The payment of the Commitment Amount shall be based on such
        tentative Assumed Tax Liability or such tentative Assumed Tax Benefit
        computation, as the case may be. As soon as feasible, but in no event
        later than 12 months after the end of the taxable year in which the
        Commitment Amount is paid based on the tentative Assumed Tax Liability
        and Assumed Tax Benefit, the Ahmanson Group shall recompute the Assumed
        Tax Liability or the Assumed Tax Benefit, as the case may be, and pay to
        the CPR Trust any excess of the re-computed Commitment Amount over the
        Commitment Amount that was initially calculated plus interest for the
        period over which the payment was deferred at a rate equal to Home
        Savings' cost of funds as submitted monthly to the FHLBSF.
    
 
   
          "Trustees" means the Delaware trustee, the institutional trustee and
     the Litigation Trustees to the CPR Trust.
    
 
   
          "Voting Stock" means, with respect to any person, stock of any class
     or classes, however designated, having ordinary voting power for the
     election of a majority of the board of such person, other than stock having
     such power only by reason of the happening of a contingency.
    
 
   
             (a) Any capitalized terms used but not defined herein shall have
        the meanings ascribed to such terms in the Merger Agreement.
    
 
   
                                   ARTICLE II
    
 
   
                                 THE COMMITMENT
    
 
   
     2.01 The Commitment. (a) Ahmanson shall pay to the CPR Trust the Commitment
Amount within the time specified under Section 2.02 hereof. In the event that
the Ahmanson Group receives the Litigation Proceeds in staggered payments, the
procedures described in this Article II with respect to the calculation and
payment of the Commitment Amount will apply in full force to each such staggered
payment of the Commitment Amount.
    
 
   
     2.02 Payment Procedures. (a) Proceeds Notice; Ahmanson Certificate. Within
10 days of the receipt by the Ahmanson Group of any Litigation Proceeds,
Ahmanson will deliver to the Litigation Trustees a written notice (the "Proceeds
Notice") specifying that such Litigation Proceeds have been received and
describing the type and amount of any Non-Cash Proceeds received. Within 10 days
of the delivery of the Proceeds Notice, the Litigation Trustees shall deliver to
Ahmanson written instructions to liquidate the Non-Cash Proceeds
    
 
                                       C-4
<PAGE>   123
 
   
received. If so instructed, Ahmanson will then liquidate or cause to be
liquidated the Non-Cash Proceeds in accordance with the instructions.
    
 
   
     As promptly as practicable but in no event later than 30 days after the
later of the receipt by Ahmanson of such Litigation Proceeds and of the
liquidation by Ahmanson of Non-Cash Proceeds, Ahmanson will deliver to the
Litigation Trustees a certificate (the "Ahmanson Certificate") setting forth the
calculation of the portion of the Commitment Amount with respect to such
Litigation Proceeds, which Ahmanson Certificate shall be valid and binding
absent manifest error. The Ahmanson Certificate shall set forth each of the
items required under this Agreement to calculate the Commitment Amount,
including the amount of Litigation Proceeds and the amount of (and calculation
of) each component of the Reimbursements and the assumptions underlying the
determination of each item and shall be substantially in the form of Exhibit A
hereto, and Ahmanson shall attach to the Ahmanson Certificate financial and
other documentation reasonably sufficient to support each item and assumption
used to calculate the Commitment Amount. Within 30 days of delivery of the
Ahmanson Certificate, the CPR Trust will give written notice specifying whether
it agrees or objects (a "Notice of Agreement" and a "Notice of Objection",
respectively) to the calculation in the Ahmanson Certificate of the portion of
the Commitment Amount with respect to such Litigation Proceeds. If the CPR Trust
delivers a Notice of Agreement, Ahmanson will then deliver the portion of the
Commitment Amount with respect to such Litigation Proceeds to the institutional
trustee for the CPR Trust within 5 business days of such Notice of Agreement. If
the CPR Trust delivers a Notice of Objection within such 30-day period, Ahmanson
will deliver such portion of the Commitment Amount only upon a Resolution.
    
 
   
          (b) Dispute Resolution. If the CPR Trust delivers a Notice of
     Objection within such 30-day period, the CPR Trust shall as promptly as
     practicable following delivery of the Notice of Objection deliver to
     Ahmanson a certificate (the "CPR Calculation Certificate") setting forth
     its calculation of such portion of the Commitment Amount. The CPR
     Calculation Certificate shall set forth each of the items required under
     this Agreement to calculate such portion of the Commitment Amount,
     including the amount of Litigation Proceeds and the amount of (and
     calculation of) each component of the Reimbursements and the assumptions
     underlying the determination of each item and shall be substantially in the
     form of Exhibit A hereto, and the CPR Trust shall attach to the CPR
     Calculation Certificate financial and other documentation reasonably
     sufficient to support each item and assumption used to calculate such
     portion of the Commitment Amount. If Ahmanson does not agree with the CPR
     Trust's calculation of such portion of the Commitment Amount, then within
     10 business days of the delivery by the CPR Trust of the CPR Calculation
     Certificate, Ahmanson and the CPR Trust shall submit the calculation of
     such portion of the Commitment Amount to a mutually agreed upon independent
     certified public accountant (the "Accountant"). If Ahmanson and the CPR
     Trust cannot agree upon such independent certified public accountant, then
     Ahmanson and the CPR Trust agree that the Accountant shall be Price
     Waterhouse. The Accountant shall be instructed to determine whether the
     calculation set forth in the Ahmanson Certificate contained manifest error
     and the Accountant shall be instructed to conclude (i) that the calculation
     set forth in the Ahmanson Certificate does not contain manifest error so
     long as the calculation is a reasonable calculation of such portion of the
     Commitment Amount based upon a reasonable interpretation of the provisions
     of this Agreement and (ii) that the calculation set forth in the Ahmanson
     Certificate contains manifest error if the calculation is not a "reasonable
     calculation of such portion of the Commitment Amount based upon a
     reasonable interpretation of the provisions of this Agreement." If the
     Accountant determines (a) that the calculation set forth in the Ahmanson
     Certificate did not contain manifest error, such portion of the Commitment
     Amount shall be as calculated in the Ahmanson Certificate or (b) that the
     calculation set forth in the Ahmanson Certificate did contain manifest
     error, the Accountant shall recompute such portion of the Commitment Amount
     based upon the formulae and definitions set forth in this Agreement and the
     Accountant's calculation shall be binding on both parties hereto (in either
     of case (i) or (ii), a "Resolution"). In the event it is determined that
     Ahmanson's calculation contained manifest error, in addition to such
     portion of the Commitment Amount, Ahmanson shall pay to the CPR Trust
     interest on such portion of the Commitment Amount calculated from the date
     that the CPR Trust delivered its Notice of Objection at an annual interest
     rate equal to the Reference Rate plus 250 basis points. Ahmanson and the
     CPR Trust shall share equally the expenses of the Accountant in connection
     with the performance of its duties described herein. If the CPR
    
 
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     Trust delivers a Notice of Objection with respect the payment of any
     portion of the Commitment Amount within the applicable 30-day period and
     prior to the Resolution there is a Determination to the effect that no
     deduction is allowed (or that any allowed deduction is limited) in respect
     of payments of the Commitment Amount under Section 483(a) in whole or in
     part, then Ahmanson shall have the right to deliver a new Ahmanson
     Certificate with a new calculation of that portion of the Commitment
     Amount, and the previously delivered Ahmanson Certificate with respect to
     that portion of the Commitment Amount shall be considered null and void;
     provided, however, that if Ahmanson delivers such a new Ahmanson
     Certificate, Ahmanson shall be required to pay interest on that portion of
     the Commitment Amount from the date of delivery of the first Ahmanson
     Certificate relating to such portion of the Commitment Amount to the date
     of delivery of the new Ahmanson Certificate relating to such portion of the
     Commitment Amount at a rate equal to Home Savings' cost of funds as
     submitted monthly to the FHLBSF. The same procedures described in this
     Section 2.02(b) for the resolution of any disputes with respect to the
     calculation contained in an Ahmanson Certificate will apply equally to the
     calculation in the new Ahmanson Certificate with respect to such portion of
     the Commitment Amount.
    
 
   
          (c) Timing of Payments. Ahmanson shall pay to the CPR Trust the
     portion of the Commitment Amount with respect to the relevant Litigation
     Proceeds (i) if the CPR Trust does not deliver a Notice of Objection to the
     Ahmanson Certificate with respect to such portion of the Commitment Amount
     within the 30-day period described above, within 5 business days of the
     earlier of the delivery of the Notice of Agreement with respect to such
     Ahmanson Certificate or the 30th day following the delivery by Ahmanson of
     such Ahmanson Certificate or (ii) if the CPR Trust does deliver a Notice of
     Objection with respect to such Ahmanson Certificate within the 30-day
     period described above, within 5 business days of the Resolution with
     respect to such portion of the Commitment Amount (each, a "Due Date"). If
     Ahmanson does not pay such portion of the Commitment Amount by the
     appropriate Due Date, Ahmanson shall be obligated to pay to the CPR Trust
     such portion of the Commitment Amount plus interest on such portion of the
     Commitment Amount from the Due Date until the date such portion of the
     Commitment Amount is paid, calculated at an annual interest rate equal to
     the Reference Rate plus 250 basis points.
    
 
   
          (d) Regulatory Restrictions. (i) Notwithstanding the foregoing,
     Ahmanson shall not be obligated to pay the Commitment Amount or any portion
     thereof at the Due Date and shall be deemed not to be in default of this
     Agreement and not to have violated its obligations hereunder by virtue of
     not having paid the Commitment Amount or such portion thereof (A) to the
     extent that Home Savings is not permitted due to regulatory restrictions to
     distribute to Ahmanson the Litigation Proceeds or such portion thereof and
     (B) if prior to the Due Date, Ahmanson shall have delivered to the CPR
     Trust an Officer's Certificate and either (y) an Opinion of Counsel or (z)
     a Regulatory Document. Ahmanson shall be entitled not to pay the Commitment
     Amount or any portion thereof as specified in the immediately preceding
     sentence with the consequences specified in the immediately preceding
     sentence for a period of 2 years from the Due Date on which the Commitment
     Amount or such portion thereof would otherwise have been payable so long as
     (I) Home Savings continues not to be permitted to distribute such portion
     of the Litigation Proceeds to Ahmanson due to regulatory restrictions and
     (II) Ahmanson delivers on a quarterly basis beginning with the first full
     fiscal quarter following the Due Date an Officer's Certificate and either
     (y) an Opinion of Counsel or (z) a Regulatory Document.
    
 
   
             (ii) Notwithstanding the foregoing, Ahmanson shall be deemed to be
        in default of this Agreement at any time specified under Section
        2.02(d)(i) hereof when payment of the Commitment Amount or such portion
        thereof would otherwise be due but when Ahmanson would be entitled not
        to make such payment and would be deemed not to be in default due to the
        regulatory restrictions described therein if, at such time, there shall
        exist a default under any mortgage, indenture or instrument under which
        there may be issued or by which there may be secured or evidenced any
        indebtedness for money borrowed by Ahmanson (but not including any such
        mortgage, indenture or instrument pursuant to which the creditor's
        remedy is limited to foreclosure of collateral), whether such
        indebtedness now exists or shall hereafter be created, which default
        shall constitute a failure to pay principal of such indebtedness in an
        amount exceeding $50 million when
    
 
                                       C-6
<PAGE>   125
 
   
        due and payable after the expiration of any applicable grace period with
        respect thereto or shall have resulted in such indebtedness in an
        aggregate principal amount exceeding $50 million becoming or being
        declared due and payable prior to the date on which it would otherwise
        have become due and payable, without such indebtedness being discharged,
        or such acceleration having been rescinded or annulled, within a period
        of 35 days after the occurrence of the event that gave rise to such
        default provided that any such event of default shall not be deemed to
        have occurred so long as Ahmanson is contesting the validity thereof in
        good faith by appropriate proceedings.
    
 
   
             (iii) Ahmanson shall be obligated to pay the Commitment Amount or
        such portion thereof at such time as such regulatory restrictions no
        longer exist, and interest on the Commitment Amount or such portion
        thereof, as the case may be, from the Due Date until the date the
        Commitment Amount or such portion thereof is paid, calculated at an
        annual interest rate equal to the Reference Rate plus 250 basis points.
    
 
   
             (iv) In the event that Home Savings is not permitted due to
        regulatory restrictions to distribute to Ahmanson the Litigation
        Proceeds as described in Section 2.02(d)(i) hereof, Ahmanson agrees to
        use its reasonable best efforts, or to cause Home Savings to use its
        reasonable best efforts, to obtain regulatory approval for the
        distribution to Ahmanson of such Litigation Proceeds.
    
 
   
          (e) Payment of Reconciliation Amount. As promptly as practicable but
     in no event later than 30 days after the recomputation of the Assumed Tax
     Liability and the Assumed Tax Benefit pursuant to paragraph (f) of the
     definition of "Tax Assumptions" herein, Ahmanson shall pay to the CPR Trust
     any excess of the re-computed Commitment Amount or portion thereof over the
     Commitment Amount or portion thereof that was initially calculated plus
     interest for the period over which the payment was deferred at a rate of
     Home Savings' cost of funds as submitted monthly to the FHLBSF. Along with
     such payment, Ahmanson shall provide to the CPR Trust an Ahmanson
     Certificate setting forth the re-calculation of the Commitment Amount or
     portion thereof, which Ahmanson Certificate shall be valid and binding
     absent manifest error. The standards and procedures applicable to Ahmanson
     Certificates and the calculation of the Commitment Amount and portions
     thereof set forth in this Section 2.02 shall apply in full force to any
     Ahmanson Certificate delivered pursuant to this paragraph (e); provided,
     however, that the CPR Trust shall have no right to object to any item set
     forth in an Ahmanson Certificate delivered pursuant to this paragraph (e)
     if such item has not changed from the prior Ahmanson Certificate delivered
     with respect to the same portion of the Commitment Amount.
    
 
   
     2.03 Agreements With Respect to Federal Income Tax. (a) Regardless of any
position taken by the Ahmanson Group on any tax return or in any claim for
refund with respect to the receipt of the Litigation Proceeds or payments of the
Commitment Amount (or of the actual payment or actual receipt of any taxes with
respect thereto), the Assumed Tax Liability shall, (i) if there is no
Determination, be computed based on the Tax Assumptions and (ii) if there is a
Determination to the effect that Litigation Proceeds are not includable in gross
income in whole or in part, be computed on the basis of the Tax Assumptions as
such Tax Assumptions are modified by such Determination.
    
 
   
          (b) Regardless of any position taken by the Ahmanson Group on any tax
     return or in any claim for refund with respect to the receipt of the
     Litigation Proceeds or payments of the Commitment Amount (or of the actual
     payment or actual receipt of any taxes with respect thereto), the Assumed
     Tax Benefit shall, (i) if there is no Determination, be computed based on
     the Tax Assumptions and (ii) if there is a Determination that no deduction
     is allowed (or that any allowed deduction is limited) with respect to the
     application of Section 483(a) to payments of the Commitment Amount, be
     computed on the basis of the Tax Assumptions as such Tax Assumptions are
     modified by such Determination.
    
 
   
          (c) A Determination that Litigation Proceeds are not includable in
     gross income in whole or in part will be deemed to be made on the earlier
     of (i) the date of a final judicial determination to such effect, binding
     upon Coast Federal (or its successor), is made in the Litigation, (ii) the
     date a final agreement to which Ahmanson is a party with the federal
     government to such effect is entered into at the direction of the
     Litigation Trustees as part of the resolution of the Litigation or a
     related IRS ruling to such effect issued to a member of the Ahmanson Group
     in connection with such agreement (it being understood that
    
 
                                       C-7
<PAGE>   126
 
   
     the Ahmanson Group shall be under no obligation to seek such a ruling or
     refund or enter into such an agreement; provided that if requested the
     Ahmanson Group will enter into such an agreement if such agreement does not
     impose any liability or obligation whatsoever (other than a standard
     settlement release relating only to the Litigation or other related claims
     that Coast or Coast Federal or Coast's stockholders might have been able to
     bring as of immediately prior to the Merger) on the Ahmanson Group or
     adversely affect or restrict the conduct of its business or adversely
     affect its tax posture with respect to other matters) and (iii) the
     effective date of a law, regulation or IRS ruling to such effect that
     applies to Ahmanson or taxpayers generally, and would be applicable to
     claims against the federal government arising out of capital credits
     affected by FIRREA. Notwithstanding the foregoing, no such Determination
     shall be deemed to be made unless it is made prior to the earlier of (x)
     thirty days before the date of filing by the Ahmanson Group of the federal
     tax return for the taxable year in which the Litigation Proceeds are
     assumed to be includible in gross income or (y) the receipt by the Ahmanson
     Group of the Litigation Proceeds.
    
 
   
          (d) A Determination with respect to the application of Section 483(a)
     to payments of the Commitment Amount will be deemed to be made on the
     earlier of (i) the date a final judicial determination to such effect
     binding upon Ahmanson is made in the Litigation, (ii) the date a final
     agreement to which Ahmanson is a party with the federal government to such
     effect is entered into at the direction of the Litigation Trustees as part
     of the resolution of the Litigation or a related IRS ruling to such effect
     issued to a member of the Ahmanson Group in connection with such agreement
     (it being understood that the Ahmanson Group shall be under no obligation
     to seek such a ruling or refund or enter into such an agreement; provided
     that if requested the Ahmanson Group will enter into such an agreement if
     such agreement does not impose any liability or obligation whatsoever
     (other than a standard settlement release relating only to the Litigation
     or other related claims that Coast or Coast Federal or Coast's stockholders
     might have been able to bring as of immediately prior to the Merger) on the
     Ahmanson Group or adversely affect or restrict the conduct of its business
     or adversely affect its tax posture with respect to other matters) and
     (iii) the effective date of a law, regulation or IRS ruling or a judicial
     decision to such effect that applies to Ahmanson or taxpayers generally. A
     deduction shall be considered allowed under Section 483(a) to the extent
     that a deduction is allowed, in an amount up to the deduction calculated
     under Section 483(a), under another substantially equivalent provision.
     Notwithstanding the foregoing, no such Determination shall be deemed to be
     made with respect to any payment of the Commitment Amount unless such
     Determination is made prior to (A) the end of the 30th day following the
     delivery to the CPR Trust of the Ahmanson Certificate with respect to such
     payment of the Commitment Amount, if the CPR Trust does not deliver a
     Notice of Objection within such 30-day period with respect to such Ahmanson
     Certificate, or (B) the Resolution with respect to such payment of the
     Commitment Amount, if the CPR Trust delivers a Notice of Objection within
     such 30-day period with respect to such Ahmanson Certificate. Subject to a
     Determination, the parties intend to treat a portion of each payment of the
     Commitment Amount as interest to the extent such payment is treated as
     interest under Section 483(a).
    
 
   
     2.04  Ranking. This Agreement shall rank pari passu with other senior
indebtedness of Ahmanson.
    
 
   
     2.05  Restrictions on Sale or Pledge of Stock of Home Savings. (a) Ahmanson
(i) shall not (A) sell, transfer or otherwise dispose of any shares of any
series of Voting Stock of Home Savings or (B) permit Home Savings to issue, sell
or otherwise dispose of shares of its Voting Stock unless in either case Home
Savings remains a Controlled Subsidiary, and (ii) shall not permit Home Savings
to (A) merge or consolidate unless the surviving entity is Ahmanson or a
Controlled Subsidiary or (B) convey or transfer its properties and assets
substantially as an entirety to any person, except to Ahmanson or a Controlled
Subsidiary.
    
 
   
          (b) Ahmanson shall not create, assume, incur or suffer to exist, as
     security for indebtedness for borrowed money, any mortgage, pledge,
     encumbrance, lien or charge of any kind upon the Voting Stock of Home
     Savings (other than directors' qualifying shares) without effectively
     providing that the CPR Certificates shall be secured equally and ratably
     with (or prior to) such indebtedness; provided, however, that Ahmanson may
     create, assume, incur or suffer to exist any such mortgage, pledge,
     encumbrance, lien or charge without regard to the foregoing provisions so
     long as after giving effect thereto Ahmanson will
    
 
                                       C-8
<PAGE>   127
 
   
     own directly or indirectly at least 80% of the Voting Stock of Home Savings
     then issued and outstanding, free and clear of any such mortgage, pledge,
     encumbrance, lien or charge.
    
 
   
          (c) Notwithstanding the foregoing, Ahmanson may avoid the restrictions
     described in the previous two paragraphs if prior to any such transaction
     Home Savings shall have unconditionally guaranteed payment when due of the
     Commitment Amount, if any, Home Savings shall have obtained all regulatory
     approvals, if any, required to permit the guarantee of the payment of the
     Commitment Amount, and Ahmanson shall have delivered to the institutional
     trustee for the CPR Trust an opinion of counsel stating that the guarantee
     of the payment of the Commitment Amount by Home Savings has been duly
     authorized, executed and delivered and constitutes a valid, legally binding
     and enforceable obligation of Home Savings.
    
 
   
     2.06  No Assignment of Claim. Ahmanson will not, and will not permit Coast
Federal or Home Savings to, "assign" (within the meaning of 31 U.S.C. sec.3727)
any interest in the Litigation. The parties acknowledge that any merger of
Ahmanson or Home Savings with any other party shall not be deemed to be or to
effect an assignment (within the meaning of 31 U.S.C. sec.3727) of the
Litigation.
    
 
   
     2.07  Indemnification. (a) The CPR Trust agrees to indemnify and advance
expenses, without requirement of bond or other security, to Ahmanson, Home
Savings, and their respective affiliates, officers, directors, employees and
agents (such persons and entities, the "Ahmanson Indemnified Parties" and,
individually, an "Ahmanson Indemnified Party"), against any and all losses,
liabilities, damages, judgments, demands, suits, claims, assessments, charges,
fines, penalties, costs and expenses, including reasonable attorney's fees and
expenses and other costs and expenses associated with defense of a claim or
incurred in obtaining indemnification hereunder, whether or not in a formal
proceeding ("Damages") (other than in connection with claims by stockholders of
Ahmanson against Ahmanson's directors with respect to actions taken at or prior
to the Merger), arising out of or relating to (i) any matter whatsoever and (ii)
with respect to claims brought by any other party, any matter relating to the
CPR Trust, the CPR Certificates, the CPR Certificate Distribution, the
Litigation and any actions taken by the Litigation Trustees (including actions
taken by the Litigation Trustees in their capacity as officers or directors of
Coast or Ahmanson so long as such actions relate to the CPR Trust including,
without limitation, the negotiation of the terms of the CPR Trust and the CPR
Certificates and the approval of the establishment of the CPR Trust and the CPR
Certificate Distribution and related transactions, but otherwise excluding
actions taken by the Litigation Trustees in such capacities), other than with
respect to Damages arising from claims against (i) Ahmanson for breach of this
Agreement, (ii) Ahmanson for breach after the Effective Time of its obligations
as successor to Coast under the CPR Trust Agreement, (iii) Ahmanson for failure
to deliver any CPR Certificate when due or to return to the CPR Trust for
cancellation of any CPR Certificate required to be returned when so required,
(iv) Ahmanson for failure to deposit the Expense Fund in a non-interest bearing
demand-deposit account in the name of the CPR Trust at Home Savings at the
Effective Time or (iv) Home Savings for breach of any depositary relationship
obligations it may have with respect to the Expense Fund. Promptly after receipt
by an Ahmanson Indemnified Party of notice of the commencement of any action,
such Ahmanson Indemnified Party shall, if a claim in respect thereof is to be
made against the CPR Trust, notify the CPR Trust of the commencement thereof;
but the omission so to notify the CPR Trust shall not relieve the CPR Trust from
any liability which it may have to any Ahmanson Indemnified Party otherwise than
under the immediately preceding sentence.
    
 
   
     If the indemnification provided for in this Section 2.07 is unavailable to
or insufficient to hold harmless an Ahmanson Indemnified Party under the first
sentence of this Section 2.07 in respect of any Damages referred to therein,
then the CPR Trust shall contribute to the amount paid or payable by such
Ahmanson Indemnified Party as a result of such Damages .
    
 
   
     2.08  Return of Excess Expense Fund. If the amount of the Litigation
Proceeds is such that there would be no Commitment Amount payable hereunder to
the CPR Trust and if at the time of receipt of the Litigation Proceeds by the
Ahmanson Group (or at the time of a final judicial determination that there will
be no Litigation Proceeds) there are amounts remaining in the Expense Fund, the
CPR Trust shall promptly return to Ahmanson such amounts less expenses
(including obligations to compensate the Trustees) incurred
    
 
                                       C-9
<PAGE>   128
 
   
by the CPR Trust through the time of receipt of the Litigation Proceeds by the
Ahmanson Group (or the time of such final judicial determination) and expenses
necessary, in the reasonable judgment of the Litigation Trustees, to terminate
the CPR Trust pursuant to the terms of the CPR Trust Agreement. Alternatively,
Ahmanson shall have the right to cause Home Savings to off-set such amounts
remaining in the Expense Fund deposited with Home Savings against the amounts
due to Ahmanson under this Section 2.08.
    
 
   
                                  ARTICLE III
    
 
   
                                 MISCELLANEOUS
    
 
   
     3.01  Waiver; Amendment. Any provision of this Agreement may be (i) waived
by the party benefitted by the provision, or (ii) amended or modified at any
time, by an agreement in writing between the parties hereto executed in the same
manner as this Agreement.
    
 
   
     3.02  Counterparts. This Commitment may be executed in one or more
counterparts, each of which shall be deemed to constitute an original.
    
 
   
     3.03  Governing Law. This Commitment shall be governed by, and interpreted
in accordance with, the laws of the State of California applicable to contracts
made and to be performed entirely within such State.
    
 
   
     3.04  Notices. All notices, requests and other communications hereunder to
a party shall be in writing and shall be deemed given if personally delivered,
telecopied (with confirmation) or mailed by registered or certified mail (return
receipt requested) to Ahmanson at its address set forth in the Merger Agreement
or to the CPR Trust to its address set forth below or such other address as such
party may specify by notice to the parties hereto.
    
 
   
     If to the CPR Trust to:
    
   
        E.A. Delle Donne Corporate Center
    
   
        Montgomery Building
    
   
        1011 Centre Road, Suite 200
    
   
        Wilmington, Delaware 19805-1266
    
   
        Attention: Lisa Wilkins
    
   
        Facsimile: (302) 636-3300
    
 
   
     With copies to:
    
   
        Bankers Trust Company
    
   
        Four Albany Street
    
   
        New York, New York 10006
    
   
        Attention: Kevin Weeks
    
   
        Facsimile: (212) 250-6961
    
 
   
        and
    
 
   
        Cleary, Gottlieb, Steen & Hamilton
    
   
        One Liberty Plaza
    
   
        New York, New York 10006
    
   
        Attention: Victor Lewkow
    
   
        Facsimile: (212) 225-3999
    
 
   
        and
    
 
   
        Mayer, Brown & Platt
    
   
        350 South Grand Avenue
    
   
        Los Angeles, California 90017-1503
    
   
        Attention: James R. Walther
    
   
        Facsimile: (213) 625-0248
    
 
   
     3.05  Entire Understanding. This Agreement and the Merger Agreement
represent the entire understanding of the parties hereto with reference to the
transactions contemplated hereby and thereby and this
    
 
                                      C-10
<PAGE>   129
 
   
Agreement supersedes any and all other oral or written agreements heretofore
made except for the Merger Agreement.
    
 
   
     3.06  No Third-Party Beneficiaries; Limitation on Liability. Except as
provided below, nothing in this Agreement expressed or implied is intended to
confer upon any person, other than the parties hereto or their respective
successors, any rights, remedies, obligations or liabilities under or by reason
of this Agreement. None of Ahmanson, Home Savings, their respective affiliates,
officers, directors, employees or agents shall have any liability to the CPR
Trust, the Litigation Trustees, any other trustee under the CPR Trust Agreement
or the holders of CPR Certificates. Without limiting the generality of the
foregoing, the holders of the CPR Certificates, the Trust and the trustees of
the Trust shall have no rights to enforce, institute or maintain any suit,
action or proceeding against Ahmanson, Home Savings, its affiliates, officers,
directors, employees or agents relating to the entering into of this Agreement,
the distribution of the CPR Certificates, the Litigation or the performance by
the Litigation Trustees of their duties as Litigation Trustees. Notwithstanding
the foregoing, the CPR Trust (or the Litigation Trustees on behalf of the CPR
Trust) may enforce, institute or maintain a suit, action or proceeding against
(i) Ahmanson for breach of this Agreement, (ii) Ahmanson for breach after the
Effective Time of its obligations as successor to Coast under the CPR Agreement,
(iii) Ahmanson for failure to deliver any CPR Certificate when due or to return
to the CPR Trust for cancellation of any CPR Certificate required to be returned
pursuant to the Merger Agreement when so required, (iv) Ahmanson for failure to
deposit the Expense Fund at the Effective Time in a non-interest bearing demand
deposit account in the name of the CPR Trust at Home Savings or (v) Home Savings
for breach of any depository relationship obligations it may have with respect
to the Expense Fund.
    
 
   
     3.07  No Other Obligations. Except as expressly set forth herein (or in any
other documents to which Ahmanson has succeeded as a matter of law), Ahmanson
shall have no other obligations to the CPR Trust, the Litigation Trustees or the
holders of CPR Certificates. Without limiting the generality of the foregoing
and except as provided in the Merger Agreement, Ahmanson shall have no
obligation to advance funds to the CPR Trust, the Litigation Trustees or the
holders of CPR Certificates. The CPR Trust hereby acknowledges that it has no
interest in any Litigation Proceeds received by the Ahmanson Group except to the
extent of the obligation of Ahmanson hereunder to pay to the CPR Trust the
Commitment Amount.
    
 
   
                                    *  *  *
    
 
                                      C-11
<PAGE>   130
 
   
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in counterparts by their duly authorized officers, all as of the day
and year first above written.
    
 
   
                                          CPR TRUST
    
 
   
                                          By:
    
   
 
    
   
                                            ------------------------------------
    
   
                                            Name:
    
   
                                            Title:
    
 
   
                                          H. F. AHMANSON & COMPANY
    
 
   
                                          By:
    
   
 
    
   
                                            ------------------------------------
    
   
                                            Name:
    
   
                                            Title:
    
 
                                      C-12
<PAGE>   131
 
   
                                                                      APPENDIX D
    
   
   Goldman, Sachs & Co. Y 85 Broad Street Y New York, New York 10004
    
   
   Tel: 212-902-1000
    
 
   
PERSONAL AND CONFIDENTIAL
    
 
   
Board of Directors
    
   
Coast Savings Financial, Inc.
    
   
1000 Wilshire Boulevard
    
   
Los Angeles, California 90017-2457
    
 
   
Ladies and Gentlemen:
    
 
   
     You have requested our opinion as to the fairness from a financial point of
view to the holders of the outstanding shares of Common Stock, par value $.01
par share (the "Shares"), of Coast Savings Financial, Inc. (the "Company") of
the Consideration (as defined below) to be received for Shares pursuant to the
merger (the "Merger") contemplated by the Amended and Restated Agreement and
Plan of Merger, dated as of October 5, 1997, by and between H. F. Ahmanson &
Company ("Ahmanson") and the Company (the "Agreement"). Pursuant to the
Agreement, the Company will merge with and into Ahmanson and (i) each
outstanding Share will be converted into 0.8082 shares of Common Stock, par
value $.01 per share (the "Ahmanson Shares"), of Ahmanson (the "Stock
Consideration"), and (ii) each holder of Contingent Payment Right Certificates
(the "CPR Certificates"), issued to holders of Shares immediately prior to the
Merger, will receive a proportionate interest in the net payments received by
the Coast Federal Litigation Contingent Payment Rights Trust (the "CPR Trust")
from Ahmanson, pursuant to a contractual commitment by Ahmanson and the CPR
Trust executed upon consummation of the Merger, of the proceeds (net of taxes,
calculated according to certain assumptions, and expenses) of any recovery on
certain pending litigation (the "Lawsuit") by the Company against the U.S.
Government (such proportionate interest together with the Stock Consideration,
the "Consideration").
    
 
   
     Goldman, Sachs & Co., as part of its investment banking business, is
continually engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings, secondary distributions of listed and unlisted securities, private
placements and valuations for estate, corporate and other purposes. We are
familiar with the Company having acted as its financial advisor in connection
with, and having participated in certain of the negotiations leading to, the
Agreement. We also have provided certain investment banking services to Ahmanson
from time to time, including having acted as lead underwriter in its offering of
$150,000,000 in 8.36% Capital Securities in November 1996, and may provide
investment banking services to Ahmanson in the future.
    
 
   
     In connection with this opinion, we have reviewed, among other things, the
Agreement; the Registration Statement of Ahmanson on Form S-4 and the Proxy
Statement/Prospectus relating to the Merger; the CPR Trust Registration
Statement on Form S-4 relating to the issuance of the CPR Certificates; Annual
Reports to Stockholders and Annual Reports on Form 10-K of the Company and
Ahmanson for the five years ended December 31, 1996; certain interim reports to
stockholders and Quarterly Reports on Form 10-Q of the Company and Ahmanson;
certain other communications from the Company and Ahmanson to their respective
stockholders; and certain internal financial analyses and forecasts for the
Company and Ahmanson prepared by their respective management including forecasts
of certain cost savings (the "Synergies") expected by Ahmanson to be achieved as
a result of the Merger and including share repurchase and capital management
policies expected to be fulfilled by Ahmanson following the Merger. We also have
held discussions with members of the senior managements of the Company and
Ahmanson regarding the past and current business operations, regulatory
relationships, financial condition and future prospects of their respective
companies and each senior management's assessment of the Synergies. In addition,
we have reviewed the reported price and trading activity for the Shares and the
Ahmanson Shares, compared certain financial and stock market information for the
Company and Ahmanson with similar information for certain
    
 
                                       D-1
<PAGE>   132
 
   
other companies the securities of which are publicly traded, reviewed the
financial terms of certain recent business combinations in the thrift industry
specifically and in other industries generally and performed such other studies
and analyses as we considered appropriate.
    
 
   
     We have relied upon the accuracy and completeness of all of the financial
and other information reviewed by us and have assumed such accuracy and
completeness for purposes of rendering this opinion. In that regard, we have
assumed, with your consent, that the financial forecasts of the Company and
Ahmanson, including, without limitation, the Synergies, the financial impact of
the anticipated share repurchase and capital management policies, and the
projections regarding under-performing and non-performing assets and net
charge-offs, have been reasonably prepared on a basis reflecting the best
currently available judgments and estimates of the Company and Ahmanson and that
such forecasts will be realized in the amounts and at the times contemplated
thereby. We are not experts in the evaluation of loan and lease portfolios for
purposes of assessing the adequacy of allowances for losses with respect thereto
and have assumed, with your consent, that such allowances for each of the
Company and Ahmanson are in the aggregate adequate to cover such losses. In
addition, we have not reviewed individual credit files nor have we made an
independent evaluation or appraisal of the assets and liabilities of the Company
or Ahmanson or any of their respective subsidiaries and we have not been
furnished with any such evaluation or appraisal. We also have assumed, with your
consent, that obtaining any necessary regulatory approvals and third party
consents for the Merger will not have an adverse affect on the Company, Ahmanson
or the combined company pursuant to the Merger. Our advisory services and the
opinion expressed herein are provided for the information and assistance of the
Board of Directors of the Company in connection with its consideration of the
Merger and such opinion does not constitute a recommendation as to how any
holder of Shares should vote with respect to the Merger.
    
 
   
     We are not legal experts and are not expressing any opinion herein as to
the potential outcome of the Lawsuit nor are we expressing any opinion herein as
to the prices at which the CPR Certificates may trade if and when they are
issued.
    
 
   
     Based upon and subject to the foregoing and based upon such other matters
as we consider relevant, it is our opinion that as of the date hereof the
Consideration to be received by the holders of Shares pursuant to the Agreement
is fair from a financial point of view to the holders of Shares receiving such
consideration.
    
 
   
Very truly yours,
    
 
                                       D-2
<PAGE>   133
 
                                                                      APPENDIX E
 
              SECTION 262 OF THE DELAWARE GENERAL CORPORATION LAW
 
                               APPRAISAL RIGHTS.
 
     (a) Any stockholder of a corporation of this State who holds shares of
stock on the date of the making of a demand pursuant to subsection (d) of this
section with respect to such shares, who continuously holds such shares through
the effective date of the merger or consolidation, who has otherwise complied
with subsection (d) of this section and who has neither voted in favor of the
merger or consolidation nor consented thereto in writing pursuant to sec.228 of
this title shall be entitled to an appraisal by the Court of Chancery of the
fair value of the stockholder's shares of stock under the circumstances
described in subsections (b) and (c) of this section. As used in this section,
the word "stockholder" means a holder of record of stock in a stock corporation
and also a member of record of a nonstock corporation; the words "stock" and
"share" mean and include what is ordinarily meant by those words and also
membership or membership interest of a member of a nonstock corporation; and the
words "depository receipt" mean a receipt or other instrument issued by a
depository representing an interest in one or more shares, or fractions thereof,
solely of stock of a corporation, which stock is deposited with the depository.
 
     (b) Appraisal rights shall be available for the shares of any class or
series of stock of a constituent corporation in a merger or consolidation to be
effected pursuant to sec.251 (other than a merger effected pursuant to
sec.251(g) of this title), sec.252, sec.254, sec.257, sec.258, sec.263 or
sec.264 of this title:
 
          (1) Provided, however, that no appraisal rights under this section
     shall be available for the shares of any class or series of stock, which
     stock, or depository receipts in respect thereof, at the record date fixed
     to determine the stockholders entitled to receive notice of and to vote at
     the meeting of stockholders to act upon the agreement of merger or
     consolidation, were either (i) listed on a national securities exchange or
     designated as a national market system security on an interdealer quotation
     system by the National Association of Securities Dealers, Inc. or (ii) held
     of record by more than 2,000 holders; and further provided that no
     appraisal rights shall be available for any shares of stock of the
     constituent corporation surviving a merger if the merger did not require
     for its approval the vote of the stockholders of the surviving corporation
     as provided in subsection (f) of sec.251 of this title.
 
          (2) Notwithstanding paragraph (1) of this subsection, appraisal rights
     under this section shall be available for the shares of any class or series
     of stock of a constituent corporation if the holders thereof are required
     by the terms of an agreement of merger or consolidation pursuant to
     sec.sec.251, 252, 254, 257, 258, 263 and 264 of this title to accept for
     such stock anything except:
 
             a. Shares of stock of the corporation surviving or resulting from
        such merger or consolidation, or depository receipts in respect thereof;
 
             b. Shares of stock of any other corporation, or depository receipts
        in respect thereof, which shares of stock (or depository receipts in
        respect thereof) or depositary receipts at the effective date of the
        merger or consolidation will be either listed on a national securities
        exchange or designated as a national market system security on an
        interdealer quotation system by the National Association of Securities
        Dealers, Inc. or held of record by more than 2,000 holders;
 
             c. Cash in lieu of fractional shares or fractional depository
        receipts described in the foregoing subparagraphs a. and b. of this
        paragraph; or
 
             d. Any combination of the shares of stock, depository receipts and
        cash in lieu of fractional shares or fractional depository receipts
        described in the foregoing subparagraphs a., b. and c. of this
        paragraph.
 
          (3) In the event all of the stock of a subsidiary Delaware corporation
     party to a merger effected under sec.253 of this title is not owned by the
     parent corporation immediately prior to the merger, appraisal rights shall
     be available for the shares of the subsidiary Delaware corporation.
 
                                       E-1
<PAGE>   134
 
     (c) Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets of
the corporation. If the certificate of incorporation contains such a provision,
the procedures of this section, including those set forth in subsections (d) and
(e) of this section, shall apply as nearly as is practicable.
 
     (d) Appraisal rights shall be perfected as follows:
 
          (1) If a proposed merger or consolidation for which appraisal rights
     are provided under this section is to be submitted for approval at a
     meeting of stockholders, the corporation, not less than 20 days prior to
     the meeting, shall notify each of its stockholders who was such on the
     record date for such meeting with respect to shares for which appraisal
     rights are available pursuant to subsections (b) or (c) hereof that
     appraisal rights are available for any or all of the shares of the
     constituent corporations, and shall include in such notice a copy of this
     section. Each stockholder electing to demand the appraisal of his shares
     shall deliver to the corporation, before the taking of the vote on the
     merger or consolidation, a written demand for appraisal of his shares. Such
     demand will be sufficient if it reasonably informs the corporation of the
     identity of the stockholder and that the stockholder intends thereby to
     demand the appraisal of his shares. A proxy or vote against the merger or
     consolidation shall not constitute such a demand. A stockholder electing to
     take such action must do so by a separate written demand as herein
     provided. Within 10 days after the effective date of such merger or
     consolidation, the surviving or resulting corporation shall notify each
     stockholder of each constituent corporation who has complied with this
     subsection and has not voted in favor of or consented to the merger or
     consolidation of the date that the merger or consolidation has become
     effective; or
 
          (2) If the merger or consolidation was approved pursuant to sec.228 or
     253 of this title, each constituent corporation, either before the
     effective date of the merger or consolidation or within ten days
     thereafter, shall notify each of the holders of any class or series of
     stock of such constituent corporation who are entitled to appraisal rights
     of the approval of the merger or consolidation and that appraisal rights
     are available for any or all shares of such class or series of stock of
     such constituent corporation, and shall include in such notice a copy of
     this section; provided that, if the notice is given on or after the
     effective date of the merger or consolidation, such notice shall be given
     by the surviving or resulting corporation to all such holders of any class
     or series of stock of a constituent corporation that are entitled to
     appraisal rights. Such notice may, and, if given on or after the effective
     date of the merger or consolidation, shall, also notify such stockholders
     of the effective date of the merger or consolidation. Any stockholder
     entitled to appraisal rights may, within 20 days after the date of mailing
     of such notice, demand in writing from the surviving or resulting
     corporation the appraisal of such holder's shares. Such demand will be
     sufficient if it reasonably informs the corporation of the identity of the
     stockholder and that the stockholder intends thereby to demand the
     appraisal of such holder's shares. If such notice did not notify
     stockholders of the effective date of the merger or consolidation, either
     (i) each such constituent corporation shall send a second notice before the
     effective date of the merger or consolidation notifying each of the holders
     of any class or series of stock of such constituent corporation that are
     entitled to appraisal rights of the effective date of the merger or
     consolidation or (ii) the surviving or resulting corporation shall send
     such a second notice to all such holders on or within 10 days after such
     effective date; provided, however, that if such second notice is sent more
     than 20 days following the sending of the first notice, such second notice
     need only be sent to each stockholder who is entitled to appraisal rights
     and who has demanded appraisal of such holder's shares in accordance with
     this subsection. An affidavit of the secretary or assistant secretary or of
     the transfer agent of the corporation that is required to give either
     notice that such notice has been given shall, in the absence of fraud, be
     prima facie evidence of the facts stated therein. For purposes of
     determining the stockholders entitled to receive either notice, each
     constituent corporation may fix, in advance, a record date that shall be
     not more than 10 days prior to the date the notice is given, provided, that
     if the notice is given on or after the effective date of the merger or
     consolidation, the record date shall be such effective date. If no record
     date is fixed and the notice is given prior to the effective date, the
     record date shall be the close of business on the day next preceding the
     day on which the notice is given.
 
                                       E-2
<PAGE>   135
 
     (e) Within 120 days after the effective date of the merger or
consolidation, the surviving or resulting corporation or any stockholder who has
complied with subsections (a) and (d) hereof and who is otherwise entitled to
appraisal rights, may file a petition in the Court of Chancery demanding a
determination of the value of the stock of all such stockholders.
Notwithstanding the foregoing, at any time within 60 days after the effective
date of the merger or consolidation, any stockholder shall have the right to
withdraw his demand for appraisal and to accept the terms offered upon the
merger or consolidation. Within 120 days after the effective date of the merger
or consolidation, any stockholder who has complied with the requirements of
subsections (a) and (d) hereof, upon written request, shall be entitled to
receive from the corporation surviving the merger or resulting from the
consolidation a statement setting forth the aggregate number of shares not voted
in favor of the merger or consolidation and with respect to which demands for
appraisal have been received and the aggregate number of holders of such shares.
Such written statement shall be mailed to the stockholder within 10 days after
his written request for such a statement is received by the surviving or
resulting corporation or within 10 days after expiration of the period for
delivery of demands for appraisal under subsection (d) hereof, whichever is
later.
 
     (f) Upon the filing of any such petition by a stockholder, service of a
copy thereof shall be made upon the surviving or resulting corporation, which
shall within 20 days after such service file in the office of the Register in
Chancery in which the petition was filed a duly verified list containing the
names and addresses of all stockholders who have demanded payment for their
shares and with whom agreements as to the value of their shares have not been
reached by the surviving or resulting corporation. If the petition shall be
filed by the surviving or resulting corporation, the petition shall be
accompanied by such a duly verified list. The Register in Chancery, if so
ordered by the Court, shall give notice of the time and place fixed for the
hearing of such petition by registered or certified mail to the surviving or
resulting corporation and to the stockholders shown on the list at the addresses
therein stated. Such notice shall also be given by 1 or more publications at
least 1 week before the day of the hearing, in a newspaper of general
circulation published in the City of Wilmington, Delaware or such publication as
the Court deems advisable. The forms of the notices by mail and by publication
shall be approved by the Court, and the costs thereof shall be borne by the
surviving or resulting corporation.
 
     (g) At the hearing on such petition, the Court shall determine the
stockholders who have complied with this section and who have become entitled to
appraisal rights. The Court may require the stockholders who have demanded an
appraisal for their shares and who hold stock represented by certificates to
submit their certificates of stock to the Register in Chancery for notation
thereon of the pendency of the appraisal proceedings; and if any stockholder
fails to comply with such direction, the Court may dismiss the proceedings as to
such stockholder.
 
     (h) After determining the stockholders entitled to an appraisal, the Court
shall appraise the shares, determining their fair value exclusive of any element
of value arising from the accomplishment or expectation of the merger or
consolidation, together with a fair rate of interest, if any, to be paid upon
the amount determined to be the fair value. In determining such fair value, the
Court shall take into account all relevant factors. In determining the fair rate
of interest, the Court may consider all relevant factors, including the rate of
interest which the surviving or resulting corporation would have had to pay to
borrow money during the pendency of the proceeding. Upon application by the
surviving or resulting corporation or by any stockholder entitled to participate
in the appraisal proceeding, the Court may, in its discretion, permit discovery
or other pretrial proceedings and may proceed to trial upon the appraisal prior
to the final determination of the stockholder entitled to an appraisal. Any
stockholder whose name appears on the list filed by the surviving or resulting
corporation pursuant to subsection (f) of this section and who has submitted his
certificates of stock to the Register in Chancery, if such is required, may
participate fully in all proceedings until it is finally determined that he is
not entitled to appraisal rights under this section.
 
     (i) The Court shall direct the payment of the fair value of the shares,
together with interest, if any, by the surviving or resulting corporation to the
stockholders entitled thereto. Interest may be simple or compound, as the Court
may direct. Payment shall be so made to each such stockholder, in the case of
holders of uncertificated stock forthwith, and the case of holders of shares
represented by certificates upon the surrender to the corporation of the
certificates representing such stock. The Court's decree may be enforced as
 
                                       E-3
<PAGE>   136
 
other decrees in the Court of Chancery may be enforced, whether such surviving
or resulting corporation be a corporation of this State or of any state.
 
     (j) The costs of the proceeding may be determined by the Court and taxed
upon the parties as the Court deems equitable in the circumstances. Upon
application of a stockholder, the Court may order all or a portion of the
expenses incurred by any stockholder in connection with the appraisal
proceeding, including, without limitation, reasonable attorney's fees and the
fees and expenses of experts, to be charged pro rata against the value of all
the shares entitled to an appraisal.
 
     (k) From and after the effective date of the merger or consolidation, no
stockholder who has demanded his appraisal rights as provided in subsection (d)
of this section shall be entitled to vote such stock for any purpose or to
receive payment of dividends or other distributions on the stock (except
dividends or other distributions payable to stockholders of record at a date
which is prior to the effective date of the merger or consolidation); provided,
however, that if no petition for an appraisal shall be filed within the time
provided in subsection (e) of this section, or if such stockholder shall deliver
to the surviving or resulting corporation a written withdrawal of his demand for
an appraisal and an acceptance of the merger or consolidation, either within 60
days after the effective date of the merger or consolidation as provided in
subsection (e) of this section or thereafter with the written approval of the
corporation, then the right of such stockholder to an appraisal shall cease.
Notwithstanding the foregoing, no appraisal proceeding in the Court of Chancery
shall be dismissed as to any stockholder without the approval of the Court, and
such approval may be conditioned upon such terms as the Court deems just.
 
     (l) The shares of the surviving or resulting corporation to which the
shares of such objecting stockholders would have been converted had they
assented to the merger or consolidation shall have the status of authorized and
unissued shares of the surviving or resulting corporation.
 
                                       E-4
<PAGE>   137
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     As permitted by Section 102(b)(7) of the DGCL, Article Sixteenth of the
Ahmanson Charter (Exhibit 4.2 hereto) eliminates the monetary liability of a
director to the corporation or its stockholders for breach of fiduciary duty as
a director, with the following exceptions, as required by Delaware law: (i)
breach of the director's duty of loyalty to the corporation or its stockholders;
(ii) acts or omissions not in good faith or which involve intentional misconduct
or a knowing violation of law; (iii) payment of unlawful dividends or making
unlawful stock purchases or redemptions; or (iv) transactions from which the
director derived an improper personal benefit.
 
     In addition, under Section 145 of the DGCL, a corporation may indemnify a
director, officer, employee or agent of the corporation against expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with any threatened,
pending or completed Proceeding (other than an action by or in the right of the
corporation) if he acted in good faith and in a manner which he reasonably
believed to be in or not opposed to the best interests of the corporation and,
with respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful. In the case of an action brought by or in the
right of the corporation, the corporation may indemnify a director, officer,
employee or agent of the corporation against expenses (including attorneys'
fees) actually and reasonably incurred by him in connection with the defense or
settlement of any threatened, pending or completed action or suit if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the corporation, except that no indemnification shall be made
in respect of any claim, issue or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that a
court determines upon application that, in view of all the circumstances of the
case, such person is fairly and reasonably entitled to indemnity for such
expenses as the court deems proper. Article VII of the Ahmanson By-laws (Exhibit
4.3 hereto) provides for indemnification of its directors, officers, employees,
and other agents to the fullest extent permitted by the DGCL.
 
     Ahmanson has insured its liability where indemnification of its directors
and officers is proper under the foregoing provisions of the Ahmanson Charter
and the Ahmanson By-laws up to an aggregate of $55,000,000.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
   
<TABLE>
<CAPTION>
    EXHIBIT
      NO.                                        DESCRIPTION
    -------   ---------------------------------------------------------------------------------
    <C>       <S>
       2.1    Amended and Restated Agreement and Plan of Merger, dated as of October 5, 1997,
              between the Registrant and Coast Savings Financial, Inc. (included as Appendix A
              to the Proxy Statement/Prospectus).
       4.1    Form of Commitment to be entered into between the CPR Trust and the Registrant
              (included as Appendix C to the Proxy Statement/Prospectus).
       4.2    Composite Certificate of Incorporation of the Registrant dated July 16, 1984
              (filed as Exhibit 3.1 to the Registrant's Annual Report on Form 10-K for the year
              ended December 31, 1991).*
       4.3    By-laws of the Registrant, as amended (filed as Exhibit 3 to the Registrant's
              Current Report on Form 8-K for the event on November 7, 1997).*
       4.4    Rights Agreement, dated as of November 7, 1997, between the Registrant and First
              Chicago Trust Company of New York, as Rights Agent (filed as Exhibit 4 to the
              Registrant's Current Report on Form 8-K for the event on November 7, 1997).*
       4.5    Certificate of Designations of the 8.40% Preferred Stock, Series C (Par Value
              $.01 Per Share), dated February 9, 1993 (filed as Exhibit 3.5 to the Registrant's
              Annual Report on Form 10-K for the year ended December 31, 1992).*
</TABLE>
    
 
                                      II-1
<PAGE>   138
 
   
<TABLE>
<CAPTION>
    EXHIBIT
      NO.                                        DESCRIPTION
    -------   ---------------------------------------------------------------------------------
    <C>       <S>
       4.6    Certificate of Designations of the 6% Cumulative Convertible Preferred Stock,
              Series D (Par Value $.01 Per Share), dated July 30, 1993 (filed as Exhibit 4.1 to
              the Registrant's Current Report on Form 8-K for the event on July 24, 1993).*
       5.1    Opinion of Sullivan & Cromwell.
       8.1    Tax opinion of Sullivan & Cromwell.
       8.2    Tax opinion of Cleary, Gottlieb, Steen & Hamilton.
      23.1    Consent of KPMG Peat Marwick LLP.
      23.2    Consent of KPMG Peat Marwick LLP.
      23.3    Consent of Sullivan & Cromwell (included in Exhibit 5.1).
      23.4    Consent of Sullivan & Cromwell (included in Exhibit 8.1).
      23.5    Consent of Cleary, Gottlieb, Steen & Hamilton (included in Exhibit 8.2).
      23.6    Consent of Goldman, Sachs & Co.
      24.1    Powers of Attorney (previously filed).
      99.1    Form of Proxy.
</TABLE>
    
 
- ---------------
 
* Incorporated by reference.
 
ITEM 22. UNDERTAKINGS.
 
     (a) The undersigned Registrant hereby undertakes:
 
          (1) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this Registration Statement;
 
              (i) To include any Prospectus required by Section 10(a)(3) of the
        Securities Act of 1933;
 
              (ii) To reflect in the Prospectus any facts or events arising
        after the effective date of the Registration Statement (or the most
        recent post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the Registration Statement;
 
             (iii) To include any material information with respect to the plan
        of distribution not previously disclosed in the Registration Statement
        or any material change to such information in the Registration
        Statement.
 
          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new Registration Statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
          (4) That prior to any public reoffering of the securities registered
     hereunder through use of a Prospectus which is a part of this Registration
     Statement, by any person or party who is deemed to be an underwriter within
     the meaning of Rule 145(c), the Registrant undertakes that such reoffering
     Prospectus will contain the information called for by the applicable
     registration form with respect to reofferings by persons who may be deemed
     underwriters, in addition to the information called for by the other Items
     of the applicable form.
 
          (5) That every Prospectus (a) that is filed pursuant to paragraph (4)
     immediately preceding, or (b) that purports to meet the requirements of
     Section 10(a)(3) of the Securities Act of 1933 and is used
 
                                      II-2
<PAGE>   139
 
     in connection with an offering of securities subject to Rule 415, will be
     filed as a part of an amendment to the Registration Statement and will not
     be used until such amendment is effective, and that, for purposes of
     determining any liability under the Securities Act of 1933, each such
     post-effective amendment shall be deemed to be a new registration statement
     relating to the securities offered therein, and the offering of such
     securities at that time shall be deemed to be the initial bona fide
     offering thereof.
 
          (6) Insofar as indemnification for liabilities arising under the
     Securities Act of 1933 may be permitted to directors, officers and
     controlling persons of the Registrant pursuant to the foregoing provisions
     (See Item 20), or otherwise, the Registrant has been advised that in the
     opinion of the Commission such indemnification is against public policy as
     expressed in the Securities Act of 1933 and is, therefore, unenforceable.
     In the event that a claim for indemnification against such liabilities
     (other than the payment by the Registrant of expenses incurred or paid by a
     director, officer or controlling person of the Registrant in the successful
     defense of any action, suit or proceeding) is asserted by such director,
     officer or controlling person in connection with the securities being
     registered, the Registrant will, unless in the opinion of its counsel the
     matter has been settled by controlling precedent, submit to a court of
     appropriate jurisdiction the question of whether such indemnification by it
     is against public policy as expressed in the Securities Act of 1933 and
     will be governed by the final adjudication of such issue.
 
          (b) The undersigned Registrant hereby undertakes to respond to
     requests for information that is incorporated by reference into the
     Prospectus pursuant to Items 4, 10(b), 11, or 13 of this Form, within one
     business day of receipt of such request, and to send the incorporated
     documents by first class mail or other equally prompt means. This includes
     information contained in documents filed subsequent to the effective date
     of the Registration Statement through the date of responding to the
     request.
 
          (c) The undersigned Registrant hereby undertakes to supply by means of
     a post-effective amendment all information concerning a transaction, and
     the company being acquired involved therein, that was not the subject of
     and included in the Registration Statement when it became effective.
 
                                      II-3
<PAGE>   140
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this Amendment to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City
of Irwindale, State of California on January 12, 1998.
    
 
                                          H. F. AHMANSON & COMPANY
 
   
                                          By:      /s/ TIM S. GLASSETT
    
                                            ------------------------------------
                                          Name: Tim S. Glassett
                                          Title: First Vice President and
                                             Assistant General Counsel
 
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Amendment to the Registration Statement has been signed by the following
persons in the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                 TITLE                      DATE
- ---------------------------------------------   -----------------------------   ------------------
<C>                                             <S>                             <C>
          /s/ CHARLES R. RINEHART*              Chairman of the Board and         January 12, 1998
- ---------------------------------------------   Chief Executive Officer
             Charles R. Rinehart                (Principal Executive Officer)
 
            /s/ KEVIN M. TWOMEY*                Senior Executive Vice             January 12, 1998
- ---------------------------------------------   President and Chief Financial
               Kevin M. Twomey                  Officer (Principal Financial
                                                Officer)
             /s/ GEORGE MIRANDA*                First Vice President and          January 12, 1998
- ---------------------------------------------   Principal Accounting Officer
               George Miranda
 
            /s/ BYRON ALLUMBAUGH*               Director                          January 12, 1998
- ---------------------------------------------
              Byron Allumbaugh
 
            /s/ HAROLD A. BLACK*                Director                          January 12, 1998
- ---------------------------------------------
               Harold A. Black
 
          /s/ RICHARD M. BRESSLER*              Director                          January 12, 1998
- ---------------------------------------------
             Richard M. Bressler
 
                                                Director
- ---------------------------------------------
               John E. Bryson
 
           /s/ DAVID R. CARPENTER*              Director                          January 12, 1998
- ---------------------------------------------
             David R. Carpenter
 
          /s/ PHILLIP D. MATTHEWS*              Director                          January 12, 1998
- ---------------------------------------------
             Phillip D. Matthews
 
            /s/ RICHARD L. NOLAN*               Director                          January 12, 1998
- ---------------------------------------------
              Richard L. Nolan
 
             /s/ DELIA M. REYES*                Director                          January 12, 1998
- ---------------------------------------------
               Delia M. Reyes
 
            /s/ FRANK M. SANCHEZ*               Director                          January 12, 1998
- ---------------------------------------------
              Frank M. Sanchez
</TABLE>
    
 
                                      II-4
<PAGE>   141
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                 TITLE                      DATE
- ---------------------------------------------   -----------------------------   ------------------
 
<C>                                             <S>                             <C>
 
          /s/ ELIZABETH A. SANDERS*             Director                          January 12, 1998
- ---------------------------------------------
            Elizabeth A. Sanders
 
           /s/ ARTHUR W. SCHMUTZ*               Director                          January 12, 1998
- ---------------------------------------------
              Arthur W. Schmutz
 
           /s/ WILLIAM D. SCHULTE*              Director                          January 12, 1998
- ---------------------------------------------
             William D. Schulte
 
           /s/ BRUCE G. WILLISON*               Director                          January 12, 1998
- ---------------------------------------------
              Bruce G. Willison
 
          *By: /s/ TIM S. GLASSETT
- ---------------------------------------------
               Tim S. Glassett
              Attorney-in-fact
</TABLE>
    
 
                                      II-5
<PAGE>   142
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
EXHIBIT
  NO.                                    DESCRIPTION
- -------     ----------------------------------------------------------------------
<C>         <S>                                                                       <C>
   2.1      Amended and Restated Agreement and Plan of Merger, dated as of October
            5, 1997, between the Registrant and Coast Savings Financial, Inc.
            (included as Appendix A to the Proxy Statement/Prospectus)
   4.1      Form of Commitment to be entered into between the CPR Trust and the
            Registrant (included as Appendix C to the Proxy Statement/Prospectus).
   4.2      Composite Certificate of Incorporation of the Registrant dated July
            16,1984 (filed as Exhibit 3.1 to the Registrant's Annual Report on
            Form 10-K for the year ended December 31, 1991)*
   4.3      By-laws of the Registrant, as amended (filed as Exhibit 3 to the
            Registrant's Current Report on Form 8-K for the event on November 7,
            1997)*
   4.4      Rights Agreement, dated as of November 7, 1997, between the Registrant
            and First Chicago Trust Company of New York, as Rights Agent (filed as
            Exhibit 4 to the Registrant's Current Report on Form 8-K for the event
            on November 7, 1997)*
   4.5      Certificate of Designations of the 8.40% Preferred Stock, Series C
            (Par Value $.01 Per Share), dated February 9, 1993 (filed as Exhibit
            3.5 to the Registrant's Annual Report on Form 10-K for the year ended
            December 31, 1992)*
   4.6      Certificate of Designations of the 6% Cumulative Convertible Preferred
            Stock, Series D (Par Value $.01 Per Share), dated July 30, 1993 (filed
            as Exhibit 4.1 to the Registrant's Current Report on Form 8-K for the
            event on July 24, 1993)*
   5.1      Opinion of Sullivan & Cromwell
   8.1      Tax opinion of Sullivan & Cromwell
   8.2      Tax opinion of Cleary, Gottlieb, Steen & Hamilton
  23.1      Consent of KPMG Peat Marwick LLP
  23.2      Consent of KPMG Peat Marwick LLP
  23.3      Consent of Sullivan & Cromwell (included in Exhibit 5.1)
  23.4      Consent of Sullivan & Cromwell (included in Exhibit 8.1)
  23.5      Consent of Cleary, Gottlieb, Steen & Hamilton (included in Exhibit
            8.2)
  23.6      Consent of Goldman, Sachs & Co.
  24.1      Powers of Attorney (previously filed)
  99.1      Form of Proxy
</TABLE>
    
 
- ---------------
 
* Incorporated by reference.

<PAGE>   1
 
                                                                     EXHIBIT 5.1
 
                        [SULLIVAN & CROMWELL LETTERHEAD]
 
                                                                January 12, 1998
 
H. F. Ahmanson & Company
4900 Rivergrade Road,
Irwindale, CA 91706
 
Dear Sirs:
 
     In connection with the registration under the Securities Act of 1933 (the
"Act") of 16,393,012 shares (the "Securities") of Common Stock, par value $.01
per share, of H. F. Ahmanson & Company, a Delaware corporation (the "Company"),
we, as your counsel, have examined such corporate records, certificates and
other documents, and such questions of law, as we have considered necessary or
appropriate for the purposes of this opinion. Upon the basis of such
examination, we advise you that, in our opinion, when the registration statement
relating to 15,993,092 of the Securities (the "Registration Statement") has
become effective under the Act and a registration statement pursuant to Rule
462(b) under the Act relating to 399,920 of the Securities has been filed and
has become effective under the Act, the Securities have been duly issued and
sold as contemplated by the Registration Statement and the merger of Coast
Savings Financial, Inc. with and into the Company has been consummated, the
Securities will be validly issued, fully paid and nonassessable.
 
     The foregoing opinion is limited to the Federal laws of the United States
and the General Corporation Law of the State of Delaware, and we are expressing
no opinion as to the effect of the laws of any other jurisdiction.
 
     Also, we have relied as to certain matters on information obtained from
public officials, officers of the Company and other sources believed by us to be
responsible.
 
     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to us under the heading "Validity of
Ahmanson Common Stock" in the Prospectus and to the incorporation by reference
of this opinion (and consent) in a registration statement to be filed by
Ahmanson pursuant to Rule 462(b) under the Act. In giving such consent, we do
not thereby admit that we are in the category of persons whose consent is
required under Section 7 of the Act.
 
                                          Very truly yours,
 
                                          /s/ SULLIVAN & CROMWELL

<PAGE>   1
 

                                                                     EXHIBIT 8.1
 

                        [SULLIVAN & CROMWELL LETTERHEAD]
 

                                                                January 12, 1998
 

H.F. Ahmanson & Company,
4900 Rivergrade Road,
Irwindale, California 91706


Dear Ladies and Gentlemen:

     We have acted as special counsel to H. F. Ahmanson & Company ("Ahmanson")
in connection with the Registration Statement on Form S-4 of Ahmanson filed with
the Securities and Exchange Commission (the "Registration Statement") and hereby
confirm to you our opinion as set forth under the heading "The Merger -- Certain
Federal Income Tax Consequences" in the Proxy Statement/Prospectus included in
the Registration Statement.
 
     We hereby consent to the filing with the Securities and Exchange Commission
of this letter as an exhibit to the Registration Statement and the reference to
us under the heading "The Merger -- Certain Federal Income Tax Consequences" and
to the incorporation by reference of this opinion (and consent) in a
registration statement to be filed by Ahmanson pursuant to Rule 462(b) under the
Securities Act of 1933. In giving such consent, we do not thereby admit that we
are within the category of persons whose consent is required under Section 7 of
the Securities Act of 1933.
 

                                          Very truly yours,
 

                                          /s/ SULLIVAN & CROMWELL

<PAGE>   1
 
                                                                     EXHIBIT 8.2
 
                [CLEARY, GOTTLIEB, STEEN & HAMILTON LETTERHEAD]
 
                                January 13, 1998
 
Coast Savings Financial, Inc.
1000 Wilshire Boulevard
Los Angeles, California 90017-2457
 
Ladies and Gentlemen:
 
     We have acted as special counsel to Coast Savings Financial, Inc. in
connection with the Registration Statement of H.F. Ahmanson & Company on Form
S-4 filed with the Securities and Exchange Commission on January 13, 1998 (the
"Registration Statement") and hereby confirm to you our opinion, set forth under
the heading "THE MERGER -- Certain Federal Income Tax Consequences" in the Proxy
Statement/ Prospectus included in the Registration Statement, under currently
applicable law.
 
     We hereby consent to the use of our name and the making of statements with
respect to us under the caption "THE MERGER -- Certain Federal Income Tax
Consequences" in the Proxy Statement/Prospectus and to the incorporation by
reference of this opinion (and consent) in a registration statement to be filed
by Ahmanson pursuant to Rule 462(b) under the Securities Act of 1933, as
amended.
 
     In giving this consent, we do not hereby admit that we are in the category
of persons whose consent is required under Section 7 of the Securities Act of
1933, as amended, or the rules and regulations of the Securities and Exchange
Commission thereunder.
 
                                          Very truly yours,
 
                                          CLEARY, GOTTLIEB, STEEN & HAMILTON
 
                                          By:     /s/  JAMES M. PEASLEE
                                            ------------------------------------
                                                James M. Peaslee, a Partner

<PAGE>   1
                                                                    EXHIBIT 23.1

                        CONSENT OF INDEPENDENT AUDITORS

The Board of Directors
H.F. Ahmanson & Company

We consent to incorporation by reference in the Form S-4 Registration
Statement of H.F. Ahmanson & Company, of our report dated January 15, 1997,
except as to note 18 of notes to the consolidated financial statements, which is
as of March 17, 1997, relating to the consolidated statements of financial
condition as of December 31, 1996 and 1995, and the related consolidated
statements of operations, stockholders' equity and cash flows for each of the
years in the three-year period ended December 31, 1996, which report appears in
the December 31, 1996 report on Form 10-K of H.F. Ahmanson & Company, and to the
reference to our firm under the heading "Experts" in the prospectus.

Our report dated January 15, 1997, except as to note 18 of notes to the
consolidated financial statements, which is as of March 17, 1997, contains an
explanatory paragraph that states that as discussed in Note 1 of the notes to
the consolidated financial statements, the Company changed its method of
accounting for goodwill in 1995.


                         
/s/ KPMG PEAT MARWICK LLP

   
Los Angeles, California
January 12, 1998
    

<PAGE>   1

                                                                 EXHIBIT 23.2



                        CONSENT OF INDEPENDENT AUDITORS



The Board of Directors
Coast Savings Financial Inc.

We consent to the incorporation by reference in the Registration Statement on
Form S-4 of H.F. Ahmanson & Company of our report dated January 23, 1997, with
respect to the consolidated statement of financial condition of Coast Savings
Financial, Inc. as of December 31, 1996 and 1995, and the related consolidated
statements of operations, stockholders' equity and cash flows for each of the
years in the three-year period ended December 31, 1996, which report appears in
the December 31, 1996 annual report on Form 10-K of Coast Savings Financial
Inc., and to the reference to our firm under the heading "Experts" in the
prospectus.


                            
/s/ KPMG PEAT MARWICK LLP

   
Los Angeles, California
January 12, 1998 
    

<PAGE>   1
 

                                                                    EXHIBIT 23.6
 

PERSONAL AND CONFIDENTIAL

Board of Directors
Coast Savings Financial, Inc.
1000 Wilshire Boulevard
Los Angeles, California 90017-2457
 

Re: Registration Statement (File No. 333-41645) on Form S-4 and Proxy
    Statement/Prospectus of H. F. Ahmanson & Company and Coast Savings
    Financial, Inc.
 

Ladies and Gentlemen:
 
     You have requested our opinion as to the fairness from a financial point of
view to the holders of the outstanding shares of Common Stock, par value $.01
per share (the "Shares"), of Coast Savings Financial, Inc. (the "Company") of
the Consideration (as defined therein) to be received for Shares pursuant to the
merger contemplated by the Amended and Restated Agreement and Plan of Merger,
dated as of October 5, 1997, by and between H. F. Ahmanson & Company and the
Company.

     The foregoing opinion letter is for the information and assistance of the
Board of Directors of the Company in connection with their consideration of the
transaction contemplated therein and is not to be used, circulated, quoted or
otherwise referred to for any other purpose, nor is it to be filed with,
included in or referred to in whole or in part in any registration statement,
proxy statement or any other document, except in accordance with our written
prior consent. We understand that the Company has determined to include our
opinion in the above-referenced Registration Statement and Proxy
Statement/Prospectus.
 
     In that regard, we hereby consent to the reference to the opinion of our
Firm under the captions "SUMMARY -- The Merger -- Opinion of Coast's Financial
Advisor" and "THE MERGER -- Background of the Merger, Reasons of Coast for the
Merger and Opinion of Coast's Financial Advisor" and to the inclusion of the
foregoing opinion as Appendix D in the Proxy Statement/Prospectus included in
the above-mentioned Registration Statement, as amended. In giving such consent,
we do not thereby admit that we come within the category of persons whose
consent is required under Section 7 of the Securities Act of 1933 or the rules
and regulations of the Securities and Exchange Commission thereunder.
 

Very truly yours,
 

/s/ GOLDMAN, SACHS & CO.

<PAGE>   1
PROXY

                         COAST SAVINGS FINANCIAL, INC.

              PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
                      FOR SPECIAL MEETING OF STOCKHOLDERS

The undersigned stockholder of Coast Savings Financial, Inc., a Delaware
corporation (the "Company"), acknowledges receipt of the Notice of Special
Meeting of Stockholders and Proxy Statement/Prospectus relating to the Company's
merger with H.F. Ahmanson & Company pursuant to an Amended and Restated
Agreement and Plan of Merger, dated as of October 5, 1997, and the transactions
contemplated thereby, and the undersigned revokes all other proxies and appoints
Ray Martin, Robert L. Hunt, II and Leon Argvire, and each of them, the attorneys
and proxies for the undersigned, each with full power of substitution, to attend
and act for the undersigned at the Company's Special Meeting of Stockholders and
at any adjournments or postponements thereof in connection therewith to vote and
represent all of the shares of the Company's Common Stock which the undersigned
would be entitled to vote.

                 (CONTINUED AND TO BE SIGNED ON REVERSE SIDE.)


- --------------------------------------------------------------------------------
                            - FOLD AND DETACH HERE -
<PAGE>   2
                                                                Please mark [X]
                                                                 your vote  
                                                                  as this


                                                        FOR   AGAINST  ABSTAIN 
1.  To approve the Merger Agreement and the             
    transactions contemplated thereby, including the    [ ]      [ ]     [ ] 
    approval of the merger of the Company with and
    into H.F. Ahmanson & Company ("Ahmanson"), the establishment of and the
    terms of the Coast Federal Litigation Contingent Payment Rights Trust (the
    "CPR Trust"), the distribution of the Contingent Payment Right Certificates
    (the "CPR Certificates"), the engagement of the Litigation Trustees of the
    CPR Trust (including the terms of their engagement), the terms of the 
    Commitment to be entered into by and between Ahmanson and the CPR Trust 
    and the rights of the holders of the CPR Certificates.

2.  In their discretion, the proxies are authorized to vote upon such other 
    business as may properly come before the meeting. Each of the above-named
    proxies present at said meeting, either in person or by substitute, shall 
    have and exercise all the powers of said proxies hereunder.

    THIS PROXY WILL BE VOTED IN ACCORDANCE WITH THE CHOICES SPECIFIED BY THE
    UNDERSIGNED. IF NO SPECIFICATIONS TO THE CONTRARY ARE INDICATED HEREON,
    THIS PROXY WILL BE TREATED AS A GRANT OF AUTHORITY TO VOTE FOR PROPOSAL 1.
    PLEASE SIGN, DATE AND RETURN YOUR PROXY PROMPTLY IN THE POSTAGE PREPAID
    ENVELOPE PROVIDED.


Signature(s) ______________________________________________ Dated: _____________

NOTE: Please sign exactly as your name appears hereon. When signing as attorney,
executor, administrator, trustee or guardian, please give full title as such.
If shares are held jointly, each holder should sign.

- --------------------------------------------------------------------------------
                            - FOLD AND DETACH HERE -


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