Since most properties on the market here have inspections and a disclosure packet up front, it will be difficult to get those documents without MLS access. 

For instance, one property seems to have an extra bathroom that is not listed in the county records.I plan to make some modifications, including removing a closet wall to expand a bathroom and taking out a kitchen island that contains electrical outlets and a switch.

Now I provide a modestly sized (42-48") TV in every bedroom, and a big one in the living room.

You are right , lot of variables and a very difficult comparison, thanks for the tip, will search the forum 

They did successfully place and a tenant who even pays early, which is a very nice change.

I’m starting to dabble in real estate investing and a local agent told me this is a great spot to network and learn.

Quote from @Jaycee Greene: If you go the conventional/DSCR route, these are considered "Commercial" loans and the properties are referred to as "Non Owner-Occupied" and, as such, the cash flow of the property is most important, and your DTI is not generally included in the underwriting.

To pick a location, I understand I want to evaluate median income, a large population of those approaching retirement age, and a decently dense population.

The Seller is required to disclose any material defects and a fire would definitely fall into that category. 

And if there was any land available, it'd cost an arm and a leg.