The Illinois 30-day notice to quit is a letter from a landlord informing their tenant that they wish to terminate the month-to-month lease agreement between the parties and that the tenant must vacate the premises within thirty (30) days. A landlord is not required to give the tenant a reason for terminating the lease. (If the landlord has reasonable cause to evict a tenant, they can serve a Notice to Quit for Non-Payment, a Notice to Quit for Illegal Activity, or a Notice to Quit for Non-Compliance.) Should the tenant fail to comply with the thirty-day notice to quit, the landlord may file an eviction suit against them.

Laws – 735 ILCS 5/9-207(b)