35 ILCS 200/18-170
In addition to the authority to abate taxes under Section 18-165, any taxing district, upon a majority vote of its governing authority, may order the county clerk to abate any portion of its taxes on property, or any class thereof, located within an Enterprise Zone created under the Illinois Enterprise Zone Act or a River Edge Redevelopment Zone created under the River Edge Redevelopment Zone Act, and upon which either new improvements have been constructed or existing improvements have been renovated or rehabilitated after December 7, 1982. However, any abatement of taxes on any parcel shall not exceed the amount attributable to the construction of the improvements and the renovation or rehabilitation of existing improvements on the parcel. In the case of property within a redevelopment area created under the Tax Increment Allocation Redevelopment Act, the abatement shall not apply unless a business enterprise or individual with regard to new improvements or renovated or rehabilitated improvements has met the requirements of Section 5.4.1 of the Illinois Enterprise Zone Act or under Section 10-5.4.1 of the River Edge Redevelopment Zone Act. If an abatement is discontinued under this Section, a municipality shall notify the county clerk and the board of review or board of appeals of the change in writing not later than July 1 of the assessment year to be first affected by the change. However, within a county economic development project area created under the County Economic
Development Project Area Property Tax Allocation Act, any municipality or county which has adopted tax increment allocation financing under the Tax Increment Allocation Redevelopment Act or the County Economic Development Project Area Tax Increment Allocation Act may abate any portion of its taxes as provided in this Section. Any other taxing district within the county economic development project area may order any portion or all of its taxes abated as provided above if the county or municipality which created the tax increment district has agreed, in writing, to the abatement.
A copy of an abatement order adopted under this Section shall be delivered to the county clerk and to the board of review or board of appeals not later than July 1 of the assessment year to be first affected by the order. If it is delivered on or after that date, it will first affect the taxes extended on the assessment of the following year. The board of review or board of appeals shall, each time the assessment books are delivered to the county clerk, also deliver a list of parcels affected by an abatement and the assessed value attributable to new improvements or to the renovation or rehabilitation of existing improvements.
35 ILCS 200/18-170