765 ILCS 715
Sec. 0.01. Short title. This Act may be cited as the Security Deposit Interest Act.
Sec. 1. A lessor of residential real property, containing 25 or more units in either a single building or a complex of buildings located on contiguous parcels of real property, who receives a security deposit from a lessee to secure the payment of rent or compensation for damage to property shall pay interest to the lessee computed from the date of the deposit at a rate equal to the interest paid by the largest commercial bank, as measured by total assets, having its main banking premises in this State on minimum deposit passbook savings accounts as of December 31 of the calendar year immediately preceding the inception of the rental agreement on any deposit held by the lessor for more than 6 months.
Sec. 2. The lessor shall, within 30 days after the end of each 12 month rental period, pay to the lessee any interest, by cash or credit to be applied to rent due, except when the lessee is in default under the terms of the lease. A lessor who willfully fails or refuses to pay the interest required by this Act shall, upon a finding by a circuit court that he has willfully failed or refused to pay, be liable for an amount equal to the amount of the security deposit, together with court costs and reasonable attorneys fees.
Sec. 3. This Act does not apply to any deposit made with respect to public housing.