My post broke the quick math down of your hypothetical situation. 

I am a retired Math and Science teacher of 25 years.  

While the math per door is roughly the same, my thought is that I will have more doors still rented while I renovate one, and the overall costs for maintenance is roughly the same. 

Use $70–$90 per sq. ft. for your napkin math.

If anyone can point me in the right direction for this math, I will see if I can get it built into this dashboard.Thank you to any who can provide guidance, insight or want to collaborate. 

Doing some back of the napkin math and listings on Redfin right now it doesn’t look like anything listed right now makes sense from an investment perspective.

I am quite interested in this property for multiple reasons , but the math isnt working.

Because the grass always looks greener on the other side.Investors are supposed to be good at math, but nobody is talking about how the math is impacted by not being local. 

I was thinking about buying the land (maybe it is 20-30k for the .25 acre lot), finding a builder in the area, and seeing if I could build a ~1,250 sq ft 3/2 single family house and see if I could make the math work. 

It sounds like the math checks out, but the underwriting doesnt.