55 ILCS 5/5-12012
The board of appeals shall fix a reasonable time for the hearing of the appeal and give due notice thereof to the parties and decide the same within a reasonable time. Upon the hearing, any party may appear in person or by agent, or by attorney. The board of appeals may reverse or affirm, wholly or partly, or may modify the order, requirement, decision or determination as in its opinion ought to be made in the premises, and to that end shall have all the powers of the officer from whom the appeal is taken.
All final administrative decisions of the board of appeals hereunder shall be subject to judicial review pursuant to the provisions of the Administrative Review Law, and all amendments and modifications thereof, and the rules adopted pursuant thereto. The term "administrative decision" is defined as in Section 3-101 of the Code of Civil Procedure.
55 ILCS 5/5-12012