All final decisions of the Commission shall be subject to appeal by the parties to the proceedings under the Administrative Review Law [ 735 ILCS 5 /Art. III] by the filing of a complaint and the issuance of summons within 35 days from the date that a copy of the Commission decision was served upon the party affected. A decision is deemed to have been served when personally delivered or when deposited in the United States mail in a sealed envelope or package, with postage prepaid, addressed to the party affected at the party's last known residence or place of business, or served by facsimile or electronic mail in accordance with Section 1.150.
Ill. Admin. Code tit. 80, § 1.300
Amended at 34 Ill. Reg. 3485, effective March 3, 2010