In this article, we provide an overview of Illinois rental applications and a free downloadable form that you can use for your rentals. Unlock the secrets to a seamless Illinois rental application process with our expert guide for landlords and property managers.Use Ilhousingsearch. Org to manage their property listings free of charge. An Illinois lease agreement is a contract that defines the relationship between a property owner and their tenant. You must submit Form ST-201, Rental Purchase Agreement Occupation Tax Return, to report and pay the Rental Purchase Agreement Occupation Tax. Rent-to-Own Lease Agreement – Contract used for a typical rental arrangement with the added course of action to purchase the residence. An Illinois lease agreement is a prevalent contract performed during the transfer of rights related to a real estate property (apartment, condo, house, etc.). I am a landlord renting properties. Do I need to give my tenants any disclosures or notices?