65 ILCS 5/9-2-120
The court having jurisdiction of the original assessment proceeding is authorized at any time after the assessment has been confirmed to extend the time of payment of the assessment, or any installment thereof, whether due or not due, heretofore or hereafter levied, and in case securities have been issued, to refund the securities and past due interest thereon, heretofore or hereafter issued in anticipation of the collection of the assessment or any installment thereof levied under the provisions of this Division 2, or any part thereof, and past due interest thereon (unless such past due interest is waived). In cases where no securities have been issued, the provisions of this section as to refunding securities shall not apply but the court, on petition of the municipality, has jurisdiction to extend the time of payment of the assessment. Securities not due may be refunded only when the holders thereof surrender the securities in exchange for refunding securities issued in lieu thereof, or deposit the securities as hereinafter provided and agree to accept payment therefor in cash in an amount not exceeding the par value thereof, together with accrued interest. This payment is to be made out of the proceeds of the sale by the municipality of those refunding securities. All securities against any installment to be refunded shall be so surrendered or deposited.
The specified court is hereby vested with authority to divide any assessment or any installment or installments thereof into a greater number of installments than was originally provided for in the order confirming the assessment and to fix the amount of each installment, if, in its judgment, such a re-division into a greater number of installments is for the best interest of all parties concerned.
As used in this section and Sections 9-2-121 through 9-2-124, "securities" means bonds, coupons (except bonds or coupons issued under Sections 9-2-127 through 9-2-129) and vouchers, public benefit vouchers, and warrants and accrued interest.
65 ILCS 5/9-2-120