We are still safe in the Midwest :D

Then, if you have to lower the rent to keep it rented, you are still safe.

Vacancies in Cleveland range fairly widely, but I always estimate for a month's vacancy (8%) in my numbers to be safe.

Trivial sink use for drinking is handled by the booster tank until it kicks in.We can run appliances + showers + yard watering w/o issues and the 85psi is safe for the water heater.

If the contractor told him 70k, and he doesn't mention to us anything about mold, lead or asbestos yet he still gives us a list of repairs to be made them I'm thinking it's pretty safe to assume that none of those repairs include the aforementioned environmental issues you're now asking about. 

Let's say ARV of $400 on the safe side.  

Upper unit was renting for $750 and lower unit was renting for $720. 2-car garage, very safe area.

I'd say it's a safe assumption that this tenant's rent is due on the 1st of the month so notice must be given before the 1st of the month for it to go into effect for that rental period. 

Travertine is always safe, but you might think about doing something a little more updated.  

They keep us all safe and sound.