And/or are you willing to take the risk of being sued by the seller for not performing on a legal contract (and losing your earnest money)?

Get a real estate attorney with some experience in the matter and have them use a PSA and back you up legally, perhaps even help with some due diligence.

I was able to see those for you here https://www.biggerpockets.com/analysis/rentals If you can't see those feel free to email [email protected] with your browser and a bit more information about where you are seeing the issue

We stayed away from anything breaks the rules....The STR we own technically in East Naples which is 100pct legal.

If the seller is trying to avoid legal issues with the city for illegally operating a property I would get out of that.

Plumbing company says its the only way to resolve the issue I have.

Period.I love my family, BUT the stories of issue with family doing business with family are ubiquitous.I hope all goes smooth for you and everyone is happy, BUT......My 2 cents,Mike

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

The plan is to provide the tenant with their own stackable laundry in their unit and offer the shed for storage.Is there a legal timeline needed to give such notice or is issuing a new lease best /covers all bases?

Do not rely on it for legal advice.