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.In Chicago, landlords must approve reasonable sublease requests unless the property is owneroccupied with six or fewer units. Key Elements: The contract should detail the sublet duration, rent amount, additional fees, and any specific rules or restrictions. 3. Run your numbers like a pro with this simple yet powerful calculator. Simplify your subleasing process with our Chicago Sublease Agreement. Easily edit, fill and sign for free with Lumin. The lease, including REQUIRED attachments, is 32 pages. • Fill in each blank. In Chicago, the legal rights and responsibilities of both landlords and tenants are covered in the Residential Landlord and Tenant Ordinance (RLTO).