(a) The parking authority is authorized to construct or cause to be constructed public off-street automobile parking facilities above, at, or below the surface of the earth including buildings, structures, equipment, entrances, exits, fencing, and all other accessories necessary or desirable for the safety or convenience of motorists using the facilities.
(b) The contracts for any of the above are to be awarded to the lowest responsible bidder in the same manner as contracts are authorized by law to be awarded in connection with highways or streets within the jurisdiction of the respective parking authority.