California Code, Harbors and Navigation Code - HNC § 735

(a) Every broker shall maintain a definite place of business in this state as his principal office and may establish other branch offices throughout the state.  Every broker maintaining more than one place of business within this state shall procure an additional license for every branch office maintained by him.  Every broker shall keep the department informed at all times of the address of his principal and branch offices and any changes of address.

(b) Every broker's license shall be prominently displayed in the broker's principal office.  The license for each branch office, if any, of such broker shall be prominently displayed in such branch office.  Every salesman's license shall be prominently displayed in the principal office or branch office of the broker in which the business of such salesman is transacted.  When a broker or any branch office to which a license was issued, for any reason ceases to be licensed, or when there is a name or address change, such license shall be immediately returned to the department.

(c) Every salesman's license shall remain in the control of the broker by whom the salesman is employed until the license is canceled or until he leaves the employment of the broker.  Immediately upon the salesman's withdrawal from the employment of the broker, such broker shall return such salesman's license to the department for cancellation and shall notify the department of the exact date of termination.

(d) Upon the issuance of a license, a pocket card of such size, design, and content as may be determined by the department may be issued without charge to such licensee, which card shall be evidence that the licensee is duly licensed pursuant to this article.  When any broker to whom a card is issued ceases for any reason to be licensed as a broker, the card issued to such broker shall be mailed or delivered by the broker to the department for cancellation.  When any salesman to whom a card is issued ceases to be a salesman for any reason, the card issued to him shall be mailed or delivered to the department for cancellation.