The best advice I have is try to get a number from the landlord, and get the negotiation ball rolling.

I guess my biggest concern is that I build and then 10 Multifamily properties come on the market that I could snap up if I had not shot a cannon ball at one project.  

Again, only my opinion, though first deal is about getting a base hit and getting the ball rolling.

And once it does, keep the ball rolling, don't stop.

There are lots of different hiccups/curve balls that could come up (i.e. borrower tries to cram down the mortgage, or strip liens from the property, or bankruptcy Trustee tries to liquidate the property, etc). 

So on top of the interest rate they earn from you on the sale, the 529 plan can invest to further save for the child's eventual education costs.Or if they're not sure yet if that child will go to college or private schools, the funds can go into the trust (more expensive to setup) and then the trust can invest that money every month into annuity or whole life insurance plan that the child can "borrow" against after age 18 to use for whatever short term fund needs they come across, or upon exercising the insurance plan towards the guardians, or later in life to the child's family.  

You will find that this exercise plus going thru the cards on a daily basis will help you immensely.

It's their job to assess risk and put the ball on the tee.

Like @Stephen Brown said, house hacking is a great way to get that investment ball rolling. 

Without going into too many of the details, I am going through a divorce and the soon to be ex was not interested in real estate investing like I am and now I have the opportunity to get the real estate investing ball rolling.