Chicago law requires landlords to allow tenants to sublease their apartments if requested. Here's what else you need to know about subleasing in Chicago.Under the Chicago ordinances, the landlord has to give you more than 30 days notice once you've been there for 6 months (even without a written lease). You can, but it's not a good idea. Most leases prohibit subletting, or only allow it with permission. A sublease, or a sublease agreement, is when a landlord and tenant agree to rent out the unit to another resident not originally on the lease agreement. Illinois tenants are generally allowed to sublet, unless their lease specifically prohibits it. Some state tenant laws say you're allowed to sublet if your lease allows it. So, re-read your lease. This group helps to find rooms, roommates and apartments in Chicago, Illinois, USA.