Find all of Domu's free, printable Chicago apartment lease agreement forms here. An Illinois lease agreement is a contract that defines the relationship between a property owner and their tenant.This lease is date sensitive and is up to date with local, county and state law for 2024. Do not use for subsequent calendar years. Rental Application Paperwork provided to those seeking the rental of a property for lease. The primary purpose of this form is to establish a formal rental agreement between landlords and tenants in Chicago. The contract can be used anywhere in the municipality to create a binding arrangement for renting residential property. Create Document. PDF. This is a sample lease for Illinois residents and landlords. You will need Adobe Reader to read this. Download.