AMENDMENT NO. 1 TO
                               BAY AREA BANCSHARES
                             1993 STOCK OPTION PLAN


This Amendment No. 1 to the Bay Area  Bancshares 1993 Stock Option Plan ("Plan")
is adopted by the Board of Directors of Bay Area Bancshares ("Corporation") with
reference to the following:
                                    RECITALS:
         A. The  Board of  Directors  of the  Corporation  desires  to amend  
the Plan to increase the number of shares for which  options may be granted,  
subject to the approval of the shareholders of the Corporation;
         B. The Board of  Directors  also  desires  to amend the Plan to provide
that options may be exercised by the delivery of a note of the optionee for some
or all of the exercise price; and
         C.
         THEREFORE, the Plan is hereby amended as follows:
         1. Section 2 of the Plan is hereby amended in full to read as follows:
"2.      STOCK SUBJECT TO OPTION
         "Subject to  adjustment  as provided in Section  6(g)  hereof,  options
under the Plan may be granted to participants  by the  Corporation  from time to
time to purchase an aggregate of Seven Hundred Fifty Thousand  (750,000) shares;
provided,  however,  that at no time shall the total  number of shares  issuable
upon  exercise  of all  outstanding  options,  plus the  total  number of shares
provided for under any  compensation  plan of the Corporation  pursuant to which
shares  of  stock  may be  issued  to  participants,  exceed  30%  of  the  then
outstanding shares of the Corporation. For purposes of calculating the aggregate
number of shares of Common Stock which may be issued under the Plan:
         "(a) Shares of Common Stock  applicable to the unexercised  portions of
options  which have  terminated  or expired may again be made subject to options
under the Plan, if at such time options may still be granted under the Plan; and
         "(b) All the shares issued  (including the shares, if any, withheld for
tax withholding  requirements) shall be counted upon exercise of an option, even
if shares of Common Stock are  delivered to the  Corporation  as payment for the
exercise."
         2.  Subsection  6(d) of the Plan is hereby  amended  in full to read as
         follows:  
         "(d)  Manner of  Exercise.  To the  extent  that the right to
purchase shares has accrued hereunder,
options may be exercised from time to time by written notice to the  Corporation
stating  the  number  of  shares  with  respect  to which  the  option  is being
exercised,  and the time of the delivery  thereof,  which shall not be less than
fifteen  (15) days and not more than  thirty  (30) days after the giving of such
notice,  unless an earlier date shall have been mutually agreed upon.  Shares of
Common Stock purchased under options shall, at the time of the notice specifying
the date of  delivery,  be paid for in full,  with cash or Common  Stock that is
owned by the  optionee,  or by  delivery of the  optionee's  note in the form of
Exhibit  A and the  Stock  Pledge  Agreement  in the form of  Exhibit  B to this
Amendment No. 1 to the Plan. To the extent  payment is being made with cash, the
optionee  shall  deliver a certified  or official  bank check or the  equivalent
thereof acceptable to the Corporation. If shares of Common Stock are tendered as
payment,  such shares shall be valued at their fair market value,  as determined
by the  Corporation,  on the date of the notice given to the  Corporation by the
optionee with respect to such exercise.  At the time specified in the notice for
delivery of the certificate,  the Corporation  shall,  without transfer or issue
tax to the optionee (or other person  entitled to exercise the option),  deliver
to the  optionee  (or other  person  entitled  to  exercise  the  option) at the
principal  office of the  Corporation,  or such other place as shall be mutually
acceptable,  a certificate or certificates for such shares;  provided,  however,
that the time of such  delivery  may be postponed  by the  Corporation  for such
period as may be required  for it with  reasonable  diligence to comply with any
requirements  of law. If the optionee (or other person  entitled to exercise the
option)  fails to pay for all or any part of the number of shares  specified  in
such  notice or fails to accept  delivery of such shares upon tender of delivery
thereof,  the right to  exercise  the option  with  respect to such  undelivered
shares may be  terminated.  The Board may  require  that a partial  exercise  of
options be for no less than a stated minimum of shares."
         3.  Subsection  6(f) of the  Plan  is  hereby  amended  by  adding  the
following paragraph (5) to the end of the subsection:
                  "(5)  Notwithstanding  the foregoing,  if the employment of an
optionee  who is an officer or the service of an  optionee  who is a director or
consultant is  "Terminated or Modified",  as defined  below,  as a result of and
within 24 months of a Change of  Control,  as defined  below,  and if any option
held by that  optionee is not fully  vested at the time of such  Termination  or
Modification,   the  remaining  installments  may  vest  immediately  upon  such
Termination or Modification,  if that is provided in the agreement  representing
such option. For purposes of this paragraph, "Terminated or Modified" is defined
as a change in the  optionee's  employment  terms that results in a reduction of
economic  benefits  to the  optionee  from the  Corporation,  including  but not
limited to a reduction in compensation,  and "Change of Control" is defined as a
merger,  acquisition or change of control that requires notice to or approval of
State or Federal banking regulators."
         4.    Subsection 6(g) of the Plan is hereby amended to read as follows:
         "(g)   Adjustments or Changes in Stock; Change in Control
                  "(1) In the event that the outstanding  shares of common stock
of the  Corporation  are  hereafter  increased  or  decreased or changed into or
exchanged  for a different  number or kind of shares or other  securities of the
Corporation  or of another  corporation,  by reason of  reorganization,  merger,
consolidation,  recapitalization,  reclassification, stock split, combination of
shares,  dividend  payable  in common  stock,  or  acquisition,  or any  similar
transaction, in which the Corporation receives no additional consideration other
than shares or other  securities,  appropriate  adjustment  shall be made by the
Board under the Plan in the number and kind of shares for the  purchase of which
options  may  granted  under  the  Plan.  In  addition,  the  Board  shall  make
appropriate  adjustment in the number and kind of shares as to which outstanding
options or portions thereof then unexercised,  shall be exercisable, so that any
participant's  proportionate  interest  in the  Corporation  by reason of rights
under  unexercised  portions of such option  shall be  maintained  as before the
occurrence of such event.  Such adjustment in outstanding  options shall be made
without change in the total price  applicable to the unexercised  portion of the
option and with a corresponding  adjustment,  if necessary,  in the option price
per share.
                  "(2) In the  event  of a  dissolution  or  liquidation  of the
Corporation,  a  merger,  consolidation,  acquisition,  or other  reorganization
involving the Corporation or a principal subsidiary, in which the Corporation or
such principal  subsidiary is not the surviving or resulting  corporation,  or a
sale by the Corporation or by a principal subsidiary of all or substantially all
of its assets, the Board shall cause the termination of all options  outstanding
hereunder as of the effective date of such transaction,  provided, however, that
advance notice of the expected effective date of such transaction shall be given
to each optionee,  to the extent  practicable,  and each optionee shall have the
right to exercise his or her option until the date of such termination as to all
or any part of the shares as to which such  option is at that time  exercisable.
In any event,  the surviving or resulting  corporation  may, in its absolute and
uncontrolled discretion,  tender options to purchase its shares on its terms and
conditions.
                  "(3) The agreements for option granted to officers,  directors
and consultants may provide that the vesting of those options will accelerate in
the event such option is terminated under paragraph (2) immediately  above. Such
acceleration shall be effective from the date of the advance notice to optionees
of the  expected  effective  date of the  transaction  until the date the option
terminates."
         5. Except as amended  herein,  the Plan shall  remain in full force and
effect.