35 ILCS 200/16-105
In counties with 3,000,000 or more inhabitants, the board of appeals (until the first Monday in December 1998 and the board of review beginning the first Monday in December 1998 and thereafter) shall meet on or before the second Monday in September in each year for the purpose of revising the assessment of property as provided for in this Code. The meeting may be adjourned from day to day as may be necessary.
All hearings conducted by the board under this Code shall be open to the public. All files maintained by the board relating to the matters specified in Sections 16-95, 16-100, and 16-140 shall be available for public inspection during regular office hours. However, only the actual portions of the income tax return relating to the property for which a complaint has been filed shall be a public record. Copies of such records shall be furnished upon request. The board may charge for the costs of copying, at 35 per page of legal size or smaller and $1 for each larger page.
35 ILCS 200/16-105