If they are tenants, they might have rights to remain until their lease is expired.  

Once the document expires, you don't have to say anything.

The first one knew the double closing process inside and I really liked working with them but communication was horrible and she tried changing the closing date on us the day before the contract expired.

Contacting failed listings, also know as expired listings is another great way to do transactions - but forget the letter - go knock on the door - ask "are you still accepting offers on this property?"

His lease is about to expire and I'm hoping he pays me another 16k.  

But since that took more time, she wants rent money back because it's been unlivable for a couple weeks instead of a couple days.So with her history of being a comparatively high maintenance tenant, AND taking advantage of my generosity, I will rent her apartment to someone else at her lease expiration.

@Rudy Hernandez Expired listings can be a source for motivated sellers.

I plan on giving the tenant an eviction notice 90 days prior to the end of her lease stating that the her lease wont be renewed and also 30 days prior to the lease expiration as stated in the lease agreement.I live in upstate NY, is this legally allowed and do you think its a good idea.

After their lease expires, I plan on moving to FL and using the property as my primary residence and then refi the mortgage as owner occupied.Question: Should I sale my AZ property and use the funds to buy another rental property in FL or payoff the mortgage on the FL property?

On top of that, it turns out he lied about being a licensed contractor, and his corporation is expired in the state of Florida.