Additionally it is critical to understand why the tenant is compelled to give cash upfront (scarcity/competition aside) so that vetting needs to be thorough. 

After knocking down a few pieces of the affected area, they discovered that the wall itself was too thin to meet code requirements and that that was the fundamental source of the problem.

The reason is most lenders won't touch them because of their source of lending money from the government.

The work is in the deal sourcing. 

To ensure success you will definitely want to associate with like-minded people, people with experience and who are already doing what it is you want to do, and people who inspire you… not naysayers, negative people, nor critics.

DM me and I can give you a referral  if you have not resolved the lending issue by now.Good luck.P.S FYI you might likely have to form an entity(LLC) to get over the hump if you source my referral. 

You can use online sources to draft it up for cheap (rocketlawyer, legalzoom, etc).

(which I've already, happily, spent hours poring over), is there another source of aggregate data I can look to?

First, what if a, hypotheticallyspeaking, massive new source of gold were discovered for mining....of a new technique allowed for more extraction than before. 

Longevity of source of income is a good differentiator as well.Also agree to not lock into long lease terms.