Cal. Fin. Code § 4879.08

A purchaser or seller that is a California state depository corporation, with the approval or its board and without further approval of the outstanding shares, may, and any other purchaser or seller, with approval as may be required under the law of its domicile, may, in its discretion, abandon the sale at any time before the sale becomes effective, subject to the contractual rights, if any, of other parties, including the seller or purchaser, as the case may be.