He figured out instead of owning the fast food building, own the land underneath and land contract to franchisees. 

Friend has their own business as well.

I do not own a rental in Byers, but I have family that does! 

Don't get me wrong, these come with their own challenges, such as the high minimum investment ($50-100K, although that's also about how much you'll need to buy a rental), and the difficulty in finding reputable sponsors.

I like to cast a wide-net....so I post my rentals on Zillow (and since they own Trulia, it also syndicates there), Redfin, Apartments.com, Realtor.com, and Homes.com. 

I don't mind doing it on my own.

I think your long term hold goal is a great mindset, I would be shooting for that goal of owning a few properties by the time you're 30.As for what to do next, I would recommend a cash out refinance as long as the rent on the mobile home would cover the payment.

I currently own a property in Kansas City, Missouri.

But be sure to have your own lawyer look over the paperwork.

Rather than wasting it or leaving it in a bank account I'm interested in starting my own investment business to supplement my real estate sales.