Exhibit 99.1


                                     PROXY
                               BANK OF PETALUMA
                  SOLICITED BY THE BOARD OF DIRECTORS FOR THE
                        SPECIAL MEETING OF SHAREHOLDERS

   The undersigned shareholder of Bank of Petaluma (the "Bank") hereby appoints
________ and ________ and each of them, the attorney, agent and proxy of the
undersigned, with full power of substitution, to vote all stock of the Bank
which the undersigned is entitled to vote at the Special Meeting of Shareholders
of the Bank to be held on , 2000 at ____ P.M. and any adjournments thereof, as
fully and with the same force and effect as the undersigned might or could do if
present, as follows:

   1. To approve and adopt the Agreement and Plan of Reorganization dated as of
March 21, 2000 by and among Bank of Petaluma, Greater Bay Bancorp and DKSS
Corp., and the transactions contemplated thereby, including the merger of DKSS
Corp. with and into Bank of Petaluma.

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

   2. To transact such other business as may properly come before the meeting.

   (This proxy will be voted as directed by the shareholder or, if no
instructions are given by the shareholder, the proxy holders will vote "FOR"
the above proposal.)

                                      (Continued and to be signed on other side)






(Continued from other side)

THE PROXY HOLDERS DESIGNATED BY THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR"
THE LISTED PROPOSAL. THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF
DIRECTORS AND MAY BE REVOKED PRIOR TO ITS EXERCISE.

--------------------------------              __________________________
        Number of Shares                      Dated

                                              ----------------------
                                              Signature of Shareholder

                                              ----------------------
                                              Print Name

                                              ----------------------
                                              Signature of Shareholder

                                              ----------------------
                                              Print Name

            When signing as attorney, executor, officer, administrator, trustee
            or guardian, please give full title. If more than one trustee, all
            should sign. All joint owners must sign.
            I/we do [_] do not [_] expect to attend this meeting.