The same triplex equity that you're looking at selling next could be worth twice as much in five year so you could buy twice as much home or shave years off of your working years. 

I talked to the company that performed the work and they indicated the only work they did on the cracks was putting nonstructural foam in them for aesthetic reasons.

An extra payment every year will shave 7 years off.

Can I use closed cell foam directly on the decking and joists?

lots of affordable Durable homes for this type of Homeless housing made with Steel, Concrete and EPS foam so they are Hurricane proof and easily refurbished.

Insulation - fiberglass, spray foam, etc5.

Then if they are not self managing shave about 30% off of their gross revenue. 

Have them spray foam it as well for an additional $750.As far as finding contractors, that's the game right there.

Rehab Construction:R-19 or higher wall insulation (except for in the Deep South)Insulated sheathing or right foam boardIf the walls aren’t T-19, HVAC should be SEER 14 (at least) and 95% AFUENew Construction:R-19 or higher wall insulation.High quality windows such as Energy Star, U-values (in the North), and Solar Heat Gain Coefficients (in the South)Who can claim the tax credit?

@Joe S. have you thought of Northwest Arkansas.