Recently in my quarterly visits I like replacing the hvac filters, run some diluted chlorine down the ac drain line, the water is very hard so I recently started running some drano down the lines.

There should be demolition/existing condition plans, site grading, roadway plans, water/wastewater/storm, and detail sheets. 

Ended up renting at 1600 with tenant paying all utilities except water with a one year lease.

3 hot water heaters or 1?

Maybe you could create a spreadsheet that has some plumbing/other construction quotes and some "what if" parameters- such as "if I found a house that has 2 bed/1 bath + kitchen/hot water heater, generally how much would it cost the plumb the whole house with new copper/PEX and a water heater".  

The power bill and water bill would be their responsibility along with any repairs going forward.

I am purchasing a mobile home park 5.5 acres with 7 occupied slips in place, sewer septic, and well water.

There is a lot of water intrusion into the basement in heavy rain.

The delta variant and other states potentially locking down coupled with the midtown and water street development will further propel STR travel.Kristina KubaKeller Williams Tampa Central

or, as another commenter said, it may indeed just need the subfloor replaced, but i'm guessing there is a water leak if it's just rot - roof leak or burst water pipe under the floor.