315 ILCS 30/14
The Department, if its sees fit so to do, may pave and improve streets in the area included in the redevelopment project, construct sidewalks and install or re-locate sewers, water pipes, and other similar facilities. The Department shall advertise for sealed bids for the doing of the work referred to in this Section. The advertisement shall describe the nature of the work to be performed and shall state the time when and place where sealed bids for the doing of the work may be delivered to the Department. The advertisement shall be published once in a newspaper having a general circulation in the municipality in which the redevelopment project is situated at least twenty (20) days prior to the date named therein when the time for receiving bids will expire. A contract for the doing of the work shall be let to the lowest responsible bidder, but the Department may reject any and all bids received and readvertise for bids. The contractor shall be required to enter into bond in an amount equal to one-third of the amount of his bid conditioned for the faithful performance of the contract. The sureties on any such bond and on any bond to be given pursuant to the provisions of Section 13 hereof shall be approved by the Chairman of the Department.
315 ILCS 30/14