35 ILCS 200/15-30
Any taxing district may enter into a mutually acceptable agreement with the owner of any exempt property whereby the owner agrees to make payments to the taxing district for the direct and indirect cost of services provided by the district. However, an agreement is not required to establish tax exempt status for the property, nor shall a taxing district use the absence of an agreement to defer or delay zoning changes, site exceptions from zoning, or other administrative measures to coerce an owner of property exempt from taxation to enter into an agreement to make voluntary payments in lieu of property taxes for the direct or indirect costs of services provided by the taxing district. However, any such zoning change, site exception from zoning, or other variance or special use granted by a municipality shall be reversed and returned to its prior status if the property is acquired by a taxable entity or used for a taxable purpose within 10 years after the change in zoning, site exception from zoning, or other variance or special use is granted. No agreement may be of more than 5 years duration, survive a change of use, or require payments in excess of taxes reasonably calculated to be due if such an agreement were not in effect and the property were not granted an exemption. An agreement may be renewed for periods of no more than 5 years.
35 ILCS 200/15-30