(35 ILCS 200/10-165)
    Sec. 10-165. Land no longer used for open space. When any portion of the land described in any application filed under Section 10-160 is no longer used for open space purposes, the person liable for taxes on that land must notify the chief county assessment officer, in writing.
    The person shall pay to the county treasurer, by the following September 1, the difference between the taxes paid in the 3 preceding years as based on a valuation under Section 10-155 and what the taxes for those years would have been when based on the valuation as otherwise permitted by law, together with 5% interest. If this difference is not paid by the following September 1, the amount of that difference shall be considered as delinquent taxes.
(Source: P.A. 80-1364; 88-455.)