The Illinois 5-Day Notice is a legal document used by a landlord in the state of Illinois to inform a tenant that they have five days to either pay the rent or vacate the premises. The notice must be served on the tenant in a specific way, such as by personal service, mail, or posting on the property. The notice must include the name and address of the tenant, the amount of past due rent, and the date by which the tenant must pay the past due rent or vacate the premises. If the tenant fails to pay the past due rent or vacate the premises, the landlord may then proceed with the eviction process. There are two types of Illinois 5 Day Notice. The first is the Non-Payment of Rent Notice, which is used when a tenant has not paid the rent due to the landlord. The second type is the Termination of Tenancy Notice, which is used when a tenant has violated the terms of the lease or rental agreement.