65 ILCS 5/11-74.2-10
When the corporate authorities have acquired title to, and possession of all or any part of the real property located within a redevelopment area, they may let contracts for the demolition or removal of buildings and for the removal of any debris. The corporate authorities shall advertise for sealed bids for doing such work. The advertisement shall describe by street number or other means of identification the location of the buildings to be demolished or removed and the time 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 20 days prior to the date for receiving bids.
The 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. Any contract entered into by the corporate authorities under this Section shall contain provisions requiring the contractor to give bond in an amount equal to 1/3 of his bid price, but in no event in excess of $25,000, conditioned for the faithful performance of the contract and requiring the contractor to furnish insurance of a character and amount to be determined by the corporate authorities protecting the corporate authorities and the municipality, its officers, agents and employees against any claims for personal injuries, including death and property damage which may be asserted because of the contract. The corporate authorities may include in any advertisement and in the contract one or more buildings, or groups of buildings, as they in their sole discretion may determine.
Notwithstanding the foregoing, if prior authorization is granted by ordinance of the corporate authority, contracts for work on commercial projects to be financed with revenue bonds payable solely from rentals, loan repayments and other receipts to be derived from such commercial projects, whether or not secured by a mortgage, may be let by the prospective lessee without advertisement or bidding.
65 ILCS 5/11-74.2-10