They have 529s to use to pay their living expenses and school tuition. 

Devin,Just a warning about checkbook IRAs: Self Dealing Activities will get your entire IRA disallowed and you will have to pay the tax on all your money.Self Dealing Activities are frighteningly easy to do.Do a Copilot search for "Problems with checkbook IRA plans."

So I wouldn't trust a bid from a Contractor unless you pay them, the other guys will just mail it in.

Unless these folks are the money managers for a money laundering scheme designed to clean blocks of cash with large denominations and private party placement and don't care about 5% US Bond scrutiny (sovereign wealth comes to mind), my first thought when I saw the 3% interest rate was skepticism.  

I'm guessing the management company would collect all rents, pay expenses etc and the individual LLC would just own the real estate.

What is the best legal structure to assume his existing land contract while either concurrently paying him or writing up a 2nd land contract to the seller past the 4 years on the current land contract?

I paid cash, but borrowed 30k from a family member to cover some extra costs and renovation, the HOA fee is $135, and I pay my family member $500 a month until the 30k is paid off.

But I have used the MyFico site to improve my credit by myself, largely by paying attention to the utilization thresholds. 

These are the only units that currently do not pay utilities, which amounts to about $250 per month per unit.

But then, as short-term rentals became ever more popular, Americans tourists started thinking wait a second "We're paying so much for staying for a week at that short-term rental.