Subletting or Assigning the Lease Often, written leases prohibit the tenant from subletting the premises without the written consent of the landlord. In Illinois, tenants usually need a landlord's consent to sublease their apartment.I've been looking up legal ways of getting out of the lease such as subletting, reletting and assignment, though I don't think a sublet would fly. Landlord is not a party to the assignment and executes this document for the limited purpose of granting its consent. The terms of a lease may also allow a tenant to assign or sublease only with the consent of the landlord or if certain conditions are met. Eviction is a court process for removing tenants and other occupants from rental property. In Illinois, only the county sheriff can perform evictions. In Chicago, standard lease agreements are made up of many parts that all need to comply with local ordinances and protect you from legal issues. In Illinois, tenants usually need a landlord's consent to sublease their apartment. The landlord needs to consent to the lease transfer through a "License to Assign" document.