35 ILCS 200/15-25
If the Department determines that any property has been unlawfully exempted from taxation, or is no longer entitled to exemption, the Department shall, before January 1 of any year, direct the chief county assessment officer to assess the property and return it to the assessment rolls for the next assessment year. The Department shall give notice of its decision to the owner of the property by certified mail. The decision shall be subject to review and hearing under Section 8-35, upon application by the owner filed within 60 days after the notice of decision is mailed. However, the extension of taxes on the assessment shall not be delayed by any proceedings under this Section. If the property is determined to be exempt, any taxes extended upon the assessment shall be abated or, if already paid, be refunded.
35 ILCS 200/15-25