65 ILCS 5/9-1-11
Whenever the treasurer of any municipality has petitioned a court of record for directions as to the distribution of undistributed or unclaimed money received from the making of any local improvement paid for wholly or in part by special assessment or special taxation, and, under order of the court, public notice has been given of the amounts of rebates payable and of the names of the persons entitled to them by publication one time in a secular newspaper of general circulation in the county where the municipality is located, and more than one year has elapsed since the publication of the notice, the judge of the court of record may order the money remaining unclaimed to be paid to the treasurer of the municipality in trust. However, in all cases where all special assessment bonds in a special assessment warrant have been paid and retired and where reimbursements have been made, all moneys remaining in such warrants shall be paid over and transferred to the general corporate fund of the municipality.
65 ILCS 5/9-1-11