California Code, Insurance Code - INS § 14045

A licensee shall not advertise or conduct business from any location other than that shown on the records of the commissioner as his or her principal place of business unless he or she has received a branch office certificate for such location after compliance with the provisions of this chapter and such additional requirements necessary for the protection of the public as the commissioner may by regulation prescribe. A licensee shall notify the commissioner in writing within 10 days after closing or changing the location of a branch office.