50 ILCS 460/35
In lieu of the establishment of the date of the first installment of a special assessment and the accrual of interest on assessments by the issuance of a first voucher and the filing of a certificate with the clerk of court or other act as may be provided by a special assessment law, either the governing body or the board of local improvements may, at any time, after the judicial order of final confirmation of the assessment roll and report, file with the clerk of court in which the assessment was confirmed a notice of the due date of the first installment and the date from which interest shall accrue on the assessments. The notice shall state the due date of the first installment, which shall be not earlier than January 2 of the following year or such later year as shall have been determined under Section 70 of this Act, and also the date upon which interest shall begin to accrue on the assessments, which date shall be not earlier than 60 days after the date the notice provided for in this Section shall have been filed with the clerk of court. In connection with the application of any special assessment law, the notice shall be treated upon its filing as if the notice were a certificate of first voucher or other act as may be provided by a special assessment law, and all procedures related to the filing of a certificate of first voucher or such other act shall be deemed to have been appropriately followed, subject only to the modifications to such procedures provided for in this Act.
50 ILCS 460/35