70 ILCS 200/255-115
The owner or owners of record of any area of land consisting of one or more tracts in Sangamon County located within the corporate limits of the Springfield Metropolitan Exposition and Auditorium Authority which (1) contains 20 or more acres; (2) is not subdivided into municipal lots and blocks; (3) is located on the border of the Springfield Metropolitan Exposition and Auditorium Authority; and (4) which, if disconnected will not result in the isolation of any part of the "Authority" from the remainder of the "Authority", may have the area disconnected as follows:
The owner or owners of record of any such area shall file a petition in the circuit court of the county in which the land is situated, alleging facts in support of the disconnection. The Springfield Metropolitan Exposition and Auditorium Authority shall be made a defendant and it or any taxpayer residing in the Springfield Metropolitan Exposition and Auditorium Authority may appear and defend against the petition. If the court finds that the allegations of the petition are true, and that the area of land is entitled to disconnection, it shall order the designated land disconnected from the Springfield Metropolitan Exposition and Auditorium Authority.
70 ILCS 200/255-115