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Hello and welcome! My name is ***** ***** I am a licensed attorney who will try my very best to help with your situation or get you to someone who can. There may be a slight delay in my responses as I research statutes or ordinances and type out an answer or reply, but rest assured, I am working on your question.
Unfortunately, he is correct in that he is legally a tenant and you would have to terminate his tenancy with a written 30 day notice handed to him and then if he didn't move out, evict him through the courts.
Once that 30 days were up, you would go to the local Justice court and file a formal eviction complaint and summons, called a "forcible detainer".. The clerks will have the forms. Then you come to court and show your proof that you gave him a 30 day and get your judgment. 6 days after the judgment is issued, you can get a writ of restitution that the sheriff will execute to physically force him to leave the property.
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...
You are very welcome, happy to help.
No, it doesn't have to be notarized, just signed by you as the "landlord". There are lots of template 30 day notices available on the internet..
See here: 30 Day Notice