Whenever any of the facilities, works or utilities of the district, or any part thereof, are not used or employed to its fullest capacity for the benefits or requirements of the district or its inhabitants, the district may enter into agreements, upon terms and conditions satisfactory to the board, for renting, leasing or otherwise using the available portion or parts of such facilities, works or utilities. In connection with any such agreement, renting or leasing, the district may undertake or perform any services incidental thereto. [Amended by 1981 c.758 § 3]