65 ILCS 5/9-2-112
Except as otherwise provided in Section 9-2-38, the board of local improvements in cities of 500,000 and over, may appoint an engineer for the board, and such assistant engineers, clerks, and inspectors as may be necessary to carry into effect the purposes of this Division 2.
The board is hereby authorized to make or cause to be made, the written contracts, and receive all bonds authorized by this Division 2, and to do any other act, expressed or implied, that pertains to the execution of the work provided for by such an ordinance. The board shall fix the time for the commencement of the work under such an ordinance and for the completion of the work under all contracts entered into by it. This work shall be prosecuted with diligence thereafter to completion and the board may extend the time so fixed from time to time, as they may think best for the public good. The work to be done pursuant to such contracts in all cases must be done under the direction and, except where the assessment is divided into installments, to the satisfaction of the board of local improvements, and all contracts made therefor must contain a provision to that effect, and also express notice that in no case, except as otherwise provided in the ordinance, or the judgment of the court, will the board, or municipality, except as otherwise provided in this Division 2, or any officer thereof, be liable for any portion of the expenses, nor for any delinquency of persons or property assessed.
The acceptance by the board of any improvement shall be conclusive in the proceeding to make the assessment, and in all proceedings to collect the assessment, or installments thereof, on all persons and property assessed therefor, that the work has been performed substantially according to the requirements of the ordinance therefor. But if any property owner is injured by any failure so to construct the improvement, or suffers any pecuniary loss thereby, he may recover the amount of the injury in a civil action against the municipality making the improvement, if the action is commenced within one year from the date of the acceptance of the work by the board of local improvements.
65 ILCS 5/9-2-112