California Code, Vehicle Code - VEH § 11609

Each office location operated and maintained by a lessor-retailer in conjunction with its retail sale of a vehicle or vehicles shall have posted in a place conspicuous to the public the license issued by the department to the lessor, and shall have erected or posted thereon such signs or devices providing information relating to the lessor-retailer's name, the office location and the office address, to enable any person doing business with such lessor to identify him properly.