Any public warehouse or other public storage or transportation facility or system owned or otherwise controlled by the Port District may be operated by the Port District or by persons under contracts with the Port District. Any such contract shall reserve reasonable rentals or other charges payable to the Port District sufficient to pay the cost of maintaining, repairing, regulating and operating the facilities and to pay principal and interest upon any revenue bonds issued by the Port District and may contain such other conditions as may be mutually agreed upon.