Im located in Phx,Az and its common here to still see empty dirt land in prime areas of city, as an example, my father who knows next to nothing about real estate purchased a 7k sqft gated dirt land  in the city 3yrs ...

Why aren't you concentrating your investments there?

And funny enough, Arizona state apparently have the highest ranked online Master Arch program, and they have a concentration in focusing on sustainable development concepts, which seem to align with my interest so I will be looking into that. 

This provides a steady income stream with minimal risk.Appreciation Potential-The property has appreciated significantly since purchase, and you could continue to benefit from further appreciation in the future.Minimal Hassle-You're already familiar with the property, and since it's paid off, you don't have mortgage payments or associated risks.Cons:Limited Portfolio Growth-Keeping the property means your investment portfolio remains concentrated in one property.

I would concentrate on the noise portion of the issue to begin with.

One thing I would add is to look for the concentration of nearby extended stay hotels, e.g.

If you have cash flow in a market where employment is concentrated in a few industries (such as automotive, entertainment, tourism, etc) then the cash flow is at greater risk that more robust economies.  

It sounds like a DSCR cash out refinance would good option for you as you can be in an LLC, no DTIs, and there are no concentration limits when it comes to how many you can do. 

Like others have said, I've heard Cincinnati can be a great market for travelling nurses due to the high concentration of hospitals

The book concentrates on promissory note FINANCE, and ways to “work” a note to end up with a higher ROI.