65 ILCS 5/9-2-98
Except as otherwise provided in Section 9-2-113, any municipality interested in the collection of any tax or special assessment, in default of other bidders, may become a purchaser at any sale of property to enforce the collection of that tax or special assessment, and by ordinance may authorize and make it the duty of one or more municipal officers to attend such sales and bid thereat in behalf of the municipality. Such a municipality, through its officer or officers, acting under like authority, in default of bidders, may withdraw from collection at such a sale any special assessment or installment thereof levied by it on any lot, parcel of land, or property subject to sale. But such a withdrawal from collection shall not operate to cancel the assessment or impair the lien of the municipality so withdrawing it, and the assessment shall remain delinquent and payable at the office of the municipal collector or county clerk, with all fees, costs, penalties, interest, and charges that have accrued thereon. Such a lot, parcel of land, or property, may be readvertised and resold at any subsequent tax sale for such delinquent special assessments or installments thereof.
Where suit is instituted by a municipality to foreclose the lien of special assessments at the request of the owner of real property or his agent, the corporate authorities shall have the power to provide by ordinance for the payment by the owner of reasonable costs and expenses incurred by the municipality in connection with the suit. Any moneys collected for such purpose shall be expended by the municipality in the same manner and for the same purposes as provided for in Section 8-1-10.
65 ILCS 5/9-2-98