Anyone and I mean Anyone, who can produce any return remotely close to 100% and repeat it in a year or a month or whatever would have more money than they know what to do with from their own investments not to mention the large amounts of job offers from investors both private and institutional.

Consider selling the duplex to put it into a higher income producing asset (out of state, DST, something).

When the money dries up, they'll leave just as quickly as they arrived and you may be stuck with a real mess.If it can produce more money as a short-term rental, do it yourself.

Are they sitting on concrete foundations with full utilities to each?

@Mark Allen Hopefully, this gold mine is still producing.

No, there simply utilizing it, adoption, as is all there competitors, so it's not any business innovation except the ai creators, it's industry adoption to a evolved S.O.P.. 

.: Quote from @Mark Cruse: Not sure why suggesting a person utilize an off-market strategy is bad.

in a few short years 1 property has produced over a $1/2 million in equity, thousands in cash flow, was leverage to buy another property which does the same and leverage to buy a small cash flowing business. 

I'm utilizing social media to the fullest with multiple groups that are centered around moving to Florida.

I self-manage and produce $700 in pure cash flow each month.Lessons learned?