65 ILCS 5/11-13-11
Every variation or special use, whether made by the board of appeals directly, or by an ordinance after a hearing before the board of appeals, shall be accompanied by findings of facts and shall refer to any exhibits containing plans and specifications for the proposed use or variation, which shall remain a part of the permanent records of the board of appeals. The findings of facts shall specify the reason or reasons for making the variation.
The terms of the relief granted shall be specifically set forth in a conclusion or statement separate from the findings of fact of the board of appeals or ordinance. Property for which relief has been granted shall not be used in violation of the specific terms of the board of appeals' findings of fact or ordinance, as the case may be, unless its usage is changed by further findings of fact of a board of appeals or additional ordinances.
65 ILCS 5/11-13-11