After he missed rent he mentioned he just got a new job and would pay, after a week, he stopped answering my calls so I went to the property. 

Yes, i forgot to mention that, i plan on having all units leased before refinancing.  

You didn't mention your other bills, like credit card debt, car payment, child care, etc so I'm assuming they are easily payable or nonexistent. 

To reach the goals you’re mentioning of 100k plus a year and beyond will require substantial capital.

Our tax person mentioned that if we move it into a solo 401k then i will be taxed significantly because it will bump me up to a new tax bracket.

If they aren't interested in selling, knock on the next door down or where the mentioned a neighbor may be thinking about selling.Repeat, Repeat, Repeat.Tip..... if someone has a sign in the yard for a car,or boat, or yard sale, etc., start a conversation about that sign first.Hope that helps.Derek Dombeck

The one tenant mentioned there are gaps for air flow, which they tried to correct on their own (prior to us owning). 

As I mentioned, a had a prohibition on the mortgage for doing this.

The lease should not mention anything about an option to buy, and the option should not refer to any lease. 

I was thinking along those lines that you mentioned Raymond about getting a property manager to help with selecting a good contractor.