This is a huge red flag. 

If a buyer is coming down with a high-down payment and quickly making a large deposit into escrow fighting tooth and nail about proof of funds may be a red herring.Credibility is also a factor here.

There's plenty of turn key people selling in war zones that bp'ers are drawn to. 

In the past basic zoning pretty much allowed you to rent a house to 2 unrelated people (family/kids obviously don't count as they are related to the adult(s). 

I would also ask all contractors about how their draw process works (red flag is: 1/3 up front, 1/3 at half way, and 1/3 at completion.  

Let’s say you have 4 acres of industrial zoned property with a 20k sf pemb.

Quote from @Jay Redding: Steve - We would be interested in taking a closer look at this. 

Check out Red Stick REIA, Westbank Real Estate Investors, Northshore REIA and NOREIA.

Right now we're in the red, which we figured.

Again, war zone type areas or even areas with poor schools and dwindling populations would not fit the model.