CORP § 12422

(a) Unless the corporation’s articles or bylaws so provide, memberships are not redeemable. A corporation may provide in its articles or bylaws for one or more classes or series of memberships which are redeemable, in whole or in part, for such consideration within such time or upon the happening of one or more specified events and upon the terms and conditions stated in the articles or bylaws. However, no membership shall actually be redeemed if prohibited by Chapter 4 (commencing with Section 12450).

(b) Nothing in this section shall prevent a corporation from creating a sinking fund or similar provision for, or entering into an agreement for, the redemption or purchase of its memberships to the extent permitted by Chapter 4 (commencing with Section 12450).