I am not shy about it on BP and routinely point out the differences between Turnkey promotional companies earning referrals and Turnkey operating companies who earn on the goods and services they provide.What you described in your question is different than most turnkey promoters and different than rent to retirement. 

There was an old superfund in the 80s to clean up metal contaminants in the soil from the old mining activity, so maybe check into that if.

Have all cleaning and maintenance invoices paid directly by each owner.

Outside/decorative curtain, no if it still looks clean, since it is not in contact with water. 

My tenant cleaned all the water up but it’s unclear any residual damage in the wall or under the floor etc.

His annual compliance report is clean he says.Owner had his Coam taken away and is the single owner running the show, an hour away from his home base. 

Clean it up, rent it at market rate, and you'll be much happier.

We have 36 STR stays under our belts and in some cases left the properties in better shape than we found them since I'm a clean nut.

Once it was cleaned out you could see how much beauty this home had and we knew exactly how to capitlize on it.

@Paul MalandrinosI would create a new clean LLC for this.What if someone sues the LLC where a flip was owned?