Create your Illinois sublease agreement, and sublet your property. Rent your unit to a subtenant with a sublease agreement form.An Illinois sublease agreement is a contract in which an existing tenant (sub-lessor) and a third-party (the sub-lessee) establish a rental arrangement. In Illinois, tenants generally have the right to sublease their apartment or rental unit unless expressly forbidden in their lease agreement. The subtenant agrees to assume all of the obligations and responsibilities of the sublessor under the original lease for the duration of the sublease agreement. Clarify private housing applications and lease requirements, and discover safety tips for finding legitimate rentals. The Subtenant agrees to pay rent to the Tenant in exchange for occupying the property. This resource provides an example of what a sublease in Illinois looks like. Download. A fillable template for an Illinois Sublease Agreement can be accessed here. To start, you can explicitly address subleasing in the original lease agreement.