In one scenario, the taxes on a property were high, but the investor bought, fixed up the property in a month, and sold in within a couple months after, so the damage wasn't too bad.

If it start to dry inbetween spray it with some water to keep it moist, it help with the process.

They are highly dependent on demand and from what you've described I wouldn't expect a lot of demand in that format of renting.If this were on the water in Marco Island FL, then you'd probably be booked all year at $6K+ per week...doesn't sound like that's the case though.

When they brought this to my attention they told me water would leak from the ground every time there was heavy rain.

Do whatever you can to get them their investment back, before someone makes a complaint to the SEC, because you are in some very dicey waters.

I'm just applying the 50% rule that says 50% of gross scheduled rents will go to vacancy, expenses (taxes, insurance, routine maintenance, make ready costs, tenant damage in excess of deposits, utilities at least when its vacant, CPA fees, legal fees) and capital (roofs, floors, appliances, furnaces, sewer lines, etc.)

You won't be able to turn on the water if the pipes don't hold pressure.

Hvac system, Water heater, Fence, Flooring, Carpet cleaning, redoing bathrooms, painting and also cutting some trees in the yard.

If you haven't started the company yet, I think a Joint Venture is a simple way to dip your toe in the water.

At least security will help pay down lost rent, damage and turnover costs.