Section 1510. (a) Death or disqualification of shareholders

A professional service corporation shall purchase or redeem the shares
  of  a  shareholder  in case of his death or disqualification pursuant to
  the provisions of section 1509, within six months after the  appointment
  of  the  executor  or administrator or other legal representative of the
  estate of such deceased shareholder, or within  six  months  after  such
  disqualification,  at the book value of such shares as of the end of the
  month  immediately  preceding  the  death  or  disqualification  of  the
  shareholder  as determined from the books and records of the corporation
  in accordance with its regular method of accounting. The certificate  of
  incorporation,  the by-laws of the corporation or an agreement among the
  corporation and all shareholders may modify this  section  by  providing
  for  a  shorter period of purchase or redemption, or an alternate method
  of determining the price to be paid for the shares, or  both.    If  the
  corporation  shall  fail  to  purchase  or redeem such shares within the
  required period, a successful plaintiff in  an  action  to  recover  the
  purchase   price  of  such  shares  shall  also  be  awarded  reasonable
  attorneys' fees and costs. Limitations on the purchase or redemption  of
  shares set forth in section five hundred thirteen shall not apply to the
  purchase  or  redemption  of  shares  pursuant  to this section. Nothing
  herein  contained  shall  prevent  a  corporation  from  paying  pension
  benefits  or  other deferred compensation to or on behalf of a former or
  deceased officer, director or employee thereof as otherwise permitted by
  law. The provisions of this section shall not be deemed to  require  the
  purchase of the shares of a disqualified shareholder where the period of
  disqualification  is for less than six months, and the shareholder again
  becomes eligible to practice his profession within six months  from  the
  date of disqualification.
    (b) Notwithstanding the provisions of subdivision (a), the corporation
  shall  not be required to purchase or redeem the shares of a deceased or
  disqualified  shareholder  if  such  shares,  within  the   time   limit
  prescribed  by  subdivision  (a),  are  sold  or  transferred to another
  professional pursuant to the provisions of section 1511.