The governing body of any such city shall have power to lease, let or rent to any person, firm, corporation or other legally organized society the building and equipment herein provided for upon such terms and conditions, including special rates for water, light and power, as they may by resolution declare: Provided, That no contract for the leasing, letting or renting of the same shall be made unless and until the terms and provisions thereof shall have been approved by the board of trustees.
K.S.A. 14-660