Of course we would come to a clear agreement prior to any money exchanging hands.  

The brokerage seems to be growing rapidly;  can this be sustained in the long run with very little brand recognition amongst customers (compared to a Keller Williams, REMAX, Coldwell Banker etc.)? 

A spouse can also participate in the same plan, there are additional tax benefits compared to an IRA, and there is generally greater privacy.

School districts are average and household income is above average compared to Ohio averages.

For example, only 3 out of our 6 units paid their rent on time the first month after we closed -- the prior LL had never enforced lease provisions. 

Renters are comparing other units to yours, I would guess central air would account for $50-75/mo in lost income overall. $1700/mo x 12 x 20=$408,000 - $1000 for window A/C units= $407,000. 

I am about to purchase a duplex.I was informed that it had meth in it, but was cleaned and certified for good bill of health.Does the fact that it has had this issue hurt value when compared to similar duplexes in the same location that have not had the issue?

What would your competitive advantage be using shipping containers compared with the competition using aluminum buildings with garage doors, a retail office, security gates, etc.?

My wife and I started an LLC prior to our first SFH rental, which we just closed on last month.

As you pointed out the prior 1031 is complete and not affected or involved.