Illinois Statutes Chapter 735. Civil Procedure § 40/28-12. Cause of action

(a) Any party aggrieved by conduct or regulation in violation of Section 28-11 of this Act may bring a civil action in a federal district court or State circuit court against the offending unit of government. Any State claim brought in federal district court shall be a supplemental claim to a federal claim. Any action brought under this Act shall be commenced within 2 years after the cause of action was discovered.

(b) Upon motion, a court shall award reasonable attorney's fees, court costs, and litigation expenses, including expert witness fees and other litigation expenses, to a plaintiff who is a prevailing party in any action brought under this Act. In awarding reasonable attorney's fees, the court shall consider the degree to which the relief obtained relates to the relief sought.