Any building or improvement that is controlled by the department may contain space in excess of the requirements of the department. Until needed, the excess space may be leased or let by the department at such rental and upon such terms and conditions as are approved by the Department of General Services.

The department may contract with the Department of General Services to handle the rentals of any space over and above that which is required for the department and to furnish general supervision and maintenance in any building or improvement that is controlled by the department.

The secretary may allocate space to the commissions, divisions, bureaus, advisory boards, and services that comprise the department or agencies that are subject to its jurisdiction in any building controlled by the department. The secretary may charge a rental for the space.

The occupancy of any space that is not required by the department for the commissions, divisions, bureaus, advisory boards, and services specified in Section 654 shall be confined to that of other functions of the department, of other state agencies, of official agencies cooperating with the department under agreement, or of official agricultural agencies of the state or county. Rentals comparable to the rentals that are authorized by Section 654 shall be charged for the space.