765 ILCS 710/1.1

In the event of a sale, lease, transfer or other direct or indirect disposition of residential real property, other than to the holder of a lien interest in such property, by a lessor who has received a security deposit or prepaid rent from a lessee, the transferee of such property shall be liable to that lessee for any security deposit, including statutory interest, or prepaid rent which the lessee has paid to the transferor. Transferor shall remain jointly and severally liable with the transferee to the lessee for such security deposit or prepaid rent.