65 ILCS 5/9-3-6
After the filing of the plans, specifications and estimate of cost, as provided in Section 9-3-5, the corporate authorities shall, by resolution, set a day and hour for a public hearing upon the proposed improvement which shall not be less than 10 days after the filing of the plans, specifications and estimate of cost. Notice of the time and place of the public hearing shall be sent by mail directed to the person who paid the general taxes for the last preceding year on each lot, tract and parcel of real estate within the boundaries of the area probably benefited, not less than 5 days prior to the date set for the public hearing. The notice in addition to the time, date and place of the public hearing shall contain a general description of the proposed improvement including the estimated cost and a statement that the plans and specifications are on file with the recording officer of the municipality for public inspection.
65 ILCS 5/9-3-6