In my city not only do you need a permit but every household within a certain distance of your building has to sign off on it.  

Other metrics that I find valuable to understand are household income, poverty, unemployment, and educational attainment.

During a title search, the seller's (wholesaler) attorney informed me that the current deed (from the original seller) has a clause that states the property could only be used for low or very low income households.

Btw to clarify terms, in my market the typical "Class C" renter is get between $12 - $20 /hour household income. 

So have 6 months of household living expenses saved up.

It includes, among other things, a comprehensive map of the Cleveland area, grading each area from A+ down to F, using a consistent, objective and transparent methodology using publicly available data.

Sounds like a comprehensive base

We actually don't include common area items in the lease but have a separate inventory and you can refer to them in the lease as deposit shall also apply to damage to household items on inventory (or something similar, forget exact wording).

I’ve seen a very comprehensive SS study showing national trends but broken down by region.

besplaces.com has average income at $36,386 with median household at 73,936.