Or help identify the key components or variables I should focus on when analyzing duplexes?

I believe the substantial economic growth combined with the items identified above make Tucson a safe bet for real estate investing in 2017.

Window should have two glass panes one inner side and one outer side.But today I noticed that it has only one glass pane(outside), there is nothing on inner side.it's something that tough to identify, whenever I looked through window it seems ok, but when I checked by touching then only I realized that one side(inner) of glass pane is missing.is there any thing we can do now?

My preferred strategy and approach would be to identify, buy and hold commercial properties with NNN structures providing passive income.  

Think your going the wrong way here in addition to the risks you've identified already.I assume you've factored in the vacancy issue and likely long term in a rural area. 

We are working on several sites that have been identified for "flips" by AT&T and T-Mobile due to the high rents.

When you call a previous landlord, not their present landlord, the first thing you say before identifying yourself is that you are calling about a apartment for rent.

I've been getting familiar with housing market here so I can identify a good deal, I've also been following bigger pockets and real estate for a while now.

When I take that kind of time to comb through over 30 pages of legal jargon and make corrections, point out issues, and identify questions I expect something in return.

Hello Mike,I would begin by identifying your ultimate goal and work backwards from there to determine which investment strategy would work best.