65 ILCS 5/9-2-121
Whenever it is desired to extend the time of payment of any assessment or any of the installments thereof and issue refunding securities, any municipality that has issued securities in anticipation of the collection of the special assessment levied under the provisions of this Division 2, upon a petition of 75% of the holders of any securities issued against any assessment or any installment or installments thereof addressed to the corporate authorities of the issuing municipality, shall adopt an ordinance directing and providing for the extension of the time of payment of the assessment or any of the installments thereof and the sale and exchange of refunding securities in anticipation of the collection of the special assessment or any of the installments thereof the time of payment of which is to be extended. The ordinance so adopted shall direct the filing of a petition in the court having jurisdiction of the original assessment. In the ordinance, the municipality shall establish a date of issue of those refunding securities and this date of issue shall be also the date from which interest on those refunding securities shall run and from which interest on the assessment so extended shall run. The ordinance for this refunding shall refer to the original assessment proceeding and no estimate or recommendation by the board of local improvements shall be required.
65 ILCS 5/9-2-121