In addition, if you don't have enough funds in the solo 401k plan to make the purchase, the solo 401k can obtain a non-recourse loan from a third-party lender.

Everytime I look for Multi-family it either seems over priced or non-existent.

If she doesn't qualify on her own, or if it's too expensive to refinance a bunch of properties to achieve the goal, then it's time to start with commercial, non conventional, no income verification loans. 

This was a win-win, as we were able to help pay the owner's medical bills, and we got a great investment!

Non-negotiable.

Most people in that area or DC or any of those, that I've known at least, tend to invest non-locally so they can get cash flow.

If the shop building or remaining 15% do not add value above and beyond your cost then I suggest protecting yourself with a non-refundable deposit or some other assurance from this buyer.  

So I know a lot of people here read realestate and business books. I'm curious if anyone reads family books to better relationships or parenting books. If so any suggestions would be awesome.

Hire a competent consultant or accountant(non-cpa) to review your books to see what you are doing right/wrong. 

I've never lived in Orlando (only been there a thousand times) but it seems like there is a non-stop flow of new vacation rentals and timeshares.