620 ILCS 52/15
If a land use exists or a municipality approves a land use that is incompatible with the Air Installation Compatible Use Zone Study, and any portion of the affected land is within areas designated in the Air Installation Compatible Use Zone Study as clear zones and runway protection zones, accident potential zones I, or accident potential zones II, or is within the 65 decibel A-weighted noise contour, the county may use eminent domain to acquire either the fee simple title to that portion of the affected land or the easement rights in that portion of the affected land that are necessary for the compatible land use defined under the Air Installation Compatible Use Zone Study. If a municipality within those zones controls the use of land in a manner compatible with the Air Installation Compatible Use Zone Study, the county does not have eminent domain authority.
620 ILCS 52/15