[BrolyTheUnholy]

I work in property management and assuming it works the same for private landlords as it does for us, you're under no obligation to renew their lease at the end of their lease term. That's why leases exist. If you're hoping to avoid any messiness, you can tell them that you're planning on selling and need the space to prepare it for sale, and that's why he has to be out and can't stay until you sell.

If he does make a big stink and purposefully causes damage to your property before he moves, that's a breach of his lease agreement and you can pursue eviction and collection of monies owed for damages if the amount done goes above and beyond what he paid for a security deposit. Hopefully it won't come to that.

Typically, 30 days' notice is all you need to provide, but in this market, giving as much notice as possible is the decent thing to do as affordable rentals are hard to come by. Protect yourself with a good excuse, even though you're not required to give one.