California Code, Vehicle Code - VEH § 11712

(a) The department shall not issue a dealer's license to any applicant therefor who has not an established place of business as defined in this code.  Should the dealer change the site or location of his established place of business, he or she shall, immediately upon making that change, so notify the department.  Should a dealer for any reason whatsoever, cease to be in possession of an established place of business from and on which he or she conducts the business for which he or she is licensed, he or she shall immediately notify the department and, upon demand by the department, shall deliver to the department the dealer's license, dealer's special plate or plates, and all report of sale books in his or her possession.

(b) Should the dealer change to, or add another franchise for the sale of new vehicles, or cancel or, for any cause whatever, otherwise lose a franchise for the sale of new vehicles, he or she shall immediately so notify the department.

(c) Any person licensed under this article who has closed his or her established place of business may be served with process issued pursuant to Chapter 5 (commencing with Section 11500) of Part 1 of Division 3 of Title 2 of the Government Code by registered mail at that place of business or at the mailing address of record if different from the established place of business, unless the person has notified the department in writing of another address where service may be made.