The Cook County RTLO provides renters' rights and landlord protections to Cook County suburban residents. This lease is up to date with Cook County and Illinois law for 2021. 2.The attached lease is in a fillable PDF format to aid in its use. Wondering how to fill out a standard rental contract? Forms for Renting Residential Property. Cook County Residential Tenant Landlord Ordinance. Find all of Domu's free, printable Chicago apartment lease agreement forms here. The lease agreement should have a full and complete description of the property that is being included as part of the lease. If you complete yours first, your tenants will receive an email with instructions to fill out their application. Clarify private housing applications and lease requirements, and discover safety tips for finding legitimate rentals.