I have a property in unincorporated Cook County (Chicago address) and I wish to NOT-renew a lease with a tenant which is expiring April 30th. 1. For Illinois/Cook County, do I have to provide a reason why I won't renew. 2. How much notice must I give? 3. Do I have to follow Chicago RLTO since it's a Chicago address or Cook County/Illinois since it's unincorporated.
You don't have to give a reason. Tell them you're moving in there or something if they want to know. What does your lease say? Typically its 30 days. I have a 60 day notice written in mine. I don't know if that would be valid in Chicago's tenant bible (Chicago RTLO). Then, I don't even know if the RTLO is valid in your area. Let us know when you find out.
Illinois landlord/tenant laws do not require notice of termination. If you are under the Chicago ordinance, they require 30 day's notice. Honestly, I believe it is good business practice to let your tenants know that you will not be renewing the lease. You do not have to supply a reason. The legal contract has been fulfilled.
Here is a link that will give you more information: