Improvement district; advertising for bids; municipality

may do work; contribution by governmental agency. A. If a continuous area proposed to be improved on any one street exceeds five hundred feet in length, the governing body, before using municipal equipment and employees to construct the improvement, shall advertise for bids for the construction of the improvement and award the contract for the construction of the improvement to the lowest responsible bidder; provided, however, a municipality may construct the improvement using the same specifications upon which bids were requested if: (1) the municipality can guarantee to construct the improvement for an amount less than the lowest bid amount and not assess the benefiting tracts or parcels of land an amount in excess of the lowest responsible bid if a bid is received; or (2) the municipality receives no bids for the construction of the improvement. B. A municipality using municipally owned or leased equipment and municipal employees in constructing an improvement may cooperate with another governmental agency which contributes money, labor or a portion of the cost of materials towards completion of the improvement.