Wood Floors not sealed, tile not properly installed and grouted, cheap flat paint that the tenants can't wipe finger prints or food splashes off, countertops not caulked so water gets behind causing water damages, the cabinets were painted over not replaced the list goes on and on.

I grabbed my multi meter and showed them the voltage in the water . 

Shared laundry meant a fifth utility meter and high water costs that I paid.

We've installed the Moen leak detection device, which detects leaks both hot water and cold water, and monitors water usage and gives you weekly reports.

Subtract $350 for HOA dues, maybe another $400-$500 for electric and internet, and potentially water bills. 

and deal with power lines, water lines and sewer, maybe seal the well. 

I don't think any water is coming into the crawlspace other than the plumbing leaks in pipes running under the house.   

under mount granite or quartz counter tops.. water closet  heated floors ..

Quote from @Jaycee Greene: Unless you already have a capital reserve fund that will pay for unforeseen, major expenses, like a new water heater, roof, or A/C unit for example, I'd keep the profits in the account until it can cover 6-12 months of operating expenses.

Pretty often no water, sewer, power or even roads to the property.