California Code, Financial Code - FIN § 6550

(a) A branch office is a legally established place of business of an association other than the home office, a remote service unit, or any agency, authorized by the board of directors and approved by the commissioner, where the business of an association may be conducted.

(b) An association may, with the approval of the commissioner, conduct business outside this state, subject to the laws of the state in which the business is done.