Sec. 3. (a) Unless otherwise provided by statute or ordinance, the works board has custody of and may maintain all real and personal property of the city.
(b) A city works board may design, order, contract for, and execute:
(1) all work required to improve or repair any real or personal property that belongs to or is used by the city; and
(2) the erection of all buildings and other structures needed for any public purpose.