In most of Illinois, leases can prohibit subletting. Failure to comply with a lease term that prohibits subletting can lead to eviction.In Illinois, tenants generally have the right to sublease their apartment or rental unit unless expressly forbidden in their lease agreement. If you are looking to sublease your apartment, please list your apartment below, and consider sharing to the Illinois State University Facebook Groups. Subletting: 3 Bedroom, 1.5 Bath apartment. It is imperative for a tenant to obtain explicit consent from the landlord in order to sublet the property in a lawful manner. For instance, in Illinois, you can sublet without your landlord's permission if your lease doesn't have a subletting provision. Illinois tenants are generally allowed to sublet, unless their lease specifically prohibits it.