@Ryan Keenan Lenders will generally add mortgage, interest, insurance, property taxes and depreciation back into your gross income when comparing it to your federal taxes and total PITI. 

Where can I find info on rent comparables (like price per square foot) for that area?

Im just in the process of comparing the advantages and disadvantages of an FHA vs 30yr fixed mortgage.

Real Estate is an investment that has the ability to deliver excellent returns because the cash down payment is such a small fraction compared to the return on the retail value .

Martial arts and fitness pay low rents per sq ft compared to medical tenants.

I compare with craigslist, hotpads, and zillow as well.

I don't know your market to know potential purchase prices, rental rates, your DTI for loan qualification purposes, what would qualify as an upgrade in your market for VA loan purposes, vacancy rates and expected maintenance costs in your market, etc. 

To live out my true purpose in life so I know my impact in other lives was meaningful. 

I have been comparing expenses between my apartments in Berwyn and my apartments in South Bend, Indiana, and I am finding that the lower end units in South Bend are using up a much, much larger percentage of rents collected than my Berwyn properties.

The purpose of this reply is that the result of all that credit activity plunged my 800 credit score down to a 500 almost overnight.