35 ILCS 200/21-55
Any person may object to an estimated tax bill under Section 21-30 on forms provided by the county collector solely on the grounds that the estimate is based on (a) a tax bill pertaining to any property which was divided subsequent to the time for preparation of the collector's books in the year previous to the year the tax bill on which the estimate is based became delinquent, or (b) the property is no longer located within the corporate limits of any taxing district. Upon a finding by the county collector that the protest is factually correct and that tax bills for that property, or divisions thereof, have been or are being prepared and will be mailed as otherwise provided in this Code, the county collector shall mark the estimated bill and his or her books in an appropriate manner and so inform the county clerk and the estimated tax bill shall be cancelled. No payment of taxes shall be required prior to the filing of an objection permitted by this Section.
35 ILCS 200/21-55