If there were any personal usage, then it would be an issue.

If you have class C rentals, I like to use Traffic master Grip Strip Water Resistant Luxury Vinyl Plank Flooring.

This means, no electricity and no water as the well can't pump - which also translates to you get one more flush on each toilet and then you are done.  

They know the tenant base, median rents of different areas, how much to increase rent each year, ranges of repair costs (ex: tenant calls and says AC isn't working, no hot water, faucet is leaking, the HVAC system goes out).

Maybe find out you didn't replace cathodes, and the water is harder there.

You should be calculating Cap Ex for all long term items that will need replacement at some point - appliances, roofs, ac, water heater, etc.

Hvac, Insinkerator, furnace, water heater, toilet, fiberglass tub, roof, driveway, etc...Here's a link: https://www.hud.gov/sites/documents/EUL_FOR_CNA_E_TOOL.PDF You might also want to consider a home inspection for each unit with a written report, and a sewer cam report.Good Luck!

Yes for houses directly on the water (such as the bay) and in a flood-zone.

Of the 3 cities, I am leaning towards Charleston since it is bounded at least partially by water and wetlands which would prevent large-scale urban sprawl and increased supply of housing.

Keep all lavatories, sinks, toilets, disposals, pump systems, and all other water and plumbing apparatus in good order and repair and shall use same only for the purposes for which they were constructed.