815 ILCS 165/5: Lessor Noncompliance.

In any successful action instituted by a lessee to recover all or any portion of a deposit withheld by a lessor who fails to comply with the requirements of Section 4, the lessee shall be entitled to recover 1 1/2 times the full amount of the deposit. If either a lessor or lessee institutes an action in a court of competent jurisdiction to adjudicate the party's right to all or a portion of a security deposit, the prevailing party shall be entitled to receive court costs plus a reasonable fee for that party's attorney.