EXHIBIT 99.2


                                                                   April 5, 2000


Dear Participant:

     The CFS Bank (the  "Bank")  401(k)  Plan (the  "401(k)  Plan")  includes an
investment  fund,  known as the  Employer  Stock Fund,  consisting  primarily of
common stock of the Bank's parent  holding  company,  Haven  Bancorp,  Inc. (the
"Company"). As a participant in the 401(k) Plan with an interest in the Employer
Stock  Fund,  you may direct the voting of the  proportion  of the shares of the
Company's  common stock held by the 401(k) Plan Trust that are allocable to your
account.

     Merrill Lynch Trust Company has been appointed as the corporate trustee for
the  Employer  Stock Fund of the 401(k) Plan (the "401(k)  Plan  Trustee").  The
401(k) Plan Trustee will vote those shares of the Company's common stock held in
the 401(k) Plan Trust in accordance with instructions of the  participants.  We,
the Board of Directors,  are forwarding to you the attached Proxy Statement, and
the Vote Authorization  Form,  provided for the purpose of conveying your voting
instructions to the 401(k) Plan Trustee.

     At this time to direct the voting of the proportion of the shares allocable
to your account  under the 401(k) Plan,  you must complete and sign the enclosed
Vote Authorization  Form and return it to Ellen Philip Associates,  Inc. ("Ellen
Philip  Associates")  in  the  accompanying  envelope.  Your  vote  will  not be
revealed,  directly or indirectly, to any director, officer or other employee of
the Company or the Bank. Your vote will be tallied by Ellen Philip Associates on
a  confidential  basis and then the 401(k) Plan  Trustee will vote the shares of
the 401(k)  Plan Trust based on the voting  instructions  it has  received  from
participants, as described above.

                                                 Sincerely,




                                                 The Board of Directors




                                       1




                               HAVEN BANCORP, INC.

                         ANNUAL MEETING OF STOCKHOLDERS
                                  May 17, 2000

                             VOTE AUTHORIZATION FORM


     I,  having  signed  this form,  hereby  instruct  the CFS Bank  401(k) Plan
("401(k)")  Trustee to vote my  proportionate  interest  in the shares of common
stock of Haven Bancorp,  Inc. held by the Employer Stock Fund of the 401(k) Plan
as set forth below at the Annual Meeting of  Stockholders  to be held on May 17,
2000, and at any adjournment or postponement thereof.

                                                        Please mark your
                                                        votes as indicated  [X]
                                                        in this example


                 THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR"
                          EACH OF THE LISTED PROPOSALS.

1.   The Election as directors of all nominees listed:  (Except as marked to the
     contrary  below) Philip S.  Messina,  Msgr.  Thomas J. Hartman,  Michael A.
     McManus, Jr.

         FOR                                                  VOTE WITHHELD
         [_]                                                        [_]

INSTRUCTION:  To  withhold  your vote for any  individual  nominee,  write  that
nominee's name on the space provided below:

- ---------------------------------------

2.   The ratification of the appointment of KPMG LLP as independent  auditors of
     Haven Bancorp, Inc. for the fiscal year ending December 31, 2000.

         FOR                   AGAINST                           ABSTAIN
         [_]                       [_]                             [_]

3.   Approval of the  proposal to adjourn or postpone  the Annual  Meeting  once
     called to order to another time and/or place for the purpose of  soliciting
     additional proxies, if necessary.

         FOR                   AGAINST                           ABSTAIN
         [_]                       [_]                             [_]

I  acknowledge  that I have  received from the Company prior to the execution of
this vote  authorization  form, a Notice of Annual  Meeting of  Stockholders,  a
Proxy  Statement  dated April 5, 2000, the Annual Report to  Stockholders  and a
letter dated April 5, 2000 from the Board of Directors.

I understand that my voting instructions are solicited by the Board of Directors
on behalf of the 401(k) Trustee for the Annual  Stockholders  Meeting to be held
on May 17, 2000, and any adjournment or postponement thereof. The 401(k) Trustee
is hereby  authorized to vote the shares  allocable to my interest in the 401(k)
Plan, in its trust capacity, as indicated above.


                                                 -------------------------------
                                                 Signature


- -------------------------------
Date

Please sign, date and return this form in the enclosed business reply envelope.