65 ILCS 5/11-74.2-11
In carrying out the provisions of a final redevelopment plan the corporate authorities may pave and improve streets in the redevelopment area, construct sidewalks and install or relocate sewers, water pipes and other similar facilities. The corporate authorities shall advertise for sealed bids for doing such work. The advertisement shall describe the nature of the work to be performed and the time when and place where sealed bids for the work may be delivered to the corporate authorities. The advertisement shall be published once in a newspaper having a general circulation in the municipality at least 20 days prior to the date for receiving bids. A contract for doing the work shall be let to the lowest responsible bidder, but the corporate authorities may reject any and all bids received and readvertise for bids. The contractor shall enter into bond in an amount equal to 1/3 of the amount of his bid conditioned for the faithful performance of the contract. The sureties on such bond and on the bond given pursuant to Section 11-74.2-10 shall be approved by the corporate authorities.
65 ILCS 5/11-74.2-11