65 ILCS 5/9-3-21
For any special assessment levied under the provisions of this Division 3 that are annulled by the corporate authorities, or set aside by any court, or declared to be invalid or void for any reason whatever, a new assessment may be made and returned, and like notice shall be given and proceedings had, as herein required in relation to the first. If any improvement is constructed in accordance with the provisions of this Division 3, and is accepted by the corporate authorities, and the special assessment attempted to be levied to pay the cost of such improvement is annulled, set aside, or declared invalid or void, then a new special assessment may be made and returned to pay the cost of the improvement so constructed, or to pay the cost of such part thereof as the governing body might lawfully authorize to be constructed, and paid for by special assessment under the provisions of this Division 3. All parties in interest shall have like rights, and the corporate authorities and the court shall perform like duties, and have like power in relation to each such new special assessment, as hereby given in this Division 3 in relation to the first regular assessment.
65 ILCS 5/9-3-21