An Illinois Terminate Leasehold Affidavit is a legally-binding document used to end a leasehold agreement between a tenant and a landlord in the state of Illinois. It is used to document the end of a tenancy, and is typically completed and signed by both parties. There are two types of Illinois Terminate Leasehold Affidavits: a Vacate Leasehold Affidavit and a Surrender Leasehold Affidavit. The Vacate Leasehold Affidavit is used when a tenant moves out of the rental property before their lease term is up, while the Surrender Leasehold Affidavit is used when a tenant moves out and surrenders the property to the landlord. Both documents must be filed with the local court in order to be legally binding. The affidavit must include information such as the names of the landlord and tenant, address of the rental property, date and length of the lease, when the tenancy ended, and any other relevant details.