We only charge third-party fees like the appraisal and the borrower pays the vendor directly.

In my case, I have residential rentals in one LLC, commercial properties in another, self-storage in a third, and my real estate company operates in a fourth.

Have every detail spelled out, use an escrow account and daily updates verifying all parties are executing their responsibilities.

I found similar patterns between all 5 companies: namely, they had taken on too many units, were over-charging me for things I didn't need, and weren't handling issues correctly (they would send out vendors who didn't know what they were doing, mis-diagnose issues etc.)No disrespect to the PMs on this chain or BP in general, but any third-party manager won't perform exactly the way you would like them to simply because of the constraints they are faced with as far as having so many units and owners to keep tabs on. 

REIA's, BP Meet Up's, General Cow Tipping Parties?

Thirdly, financing and potentially selling later on could be challenging again with the part of the plan being on a campground. 

If you hire someone typically they are the ones providing this information, but if someone is paying you, then yes they need this information for tax purposes.BTW - I would say your SS# has been hacked so many times and is on the black market already this is why we monitor ours through other parties or just lock it down at experian and other agencies if you are concerned about it.

Moving from SFR to MF has its own learning curve without the development part.  I

I think this arrangement can suit both parties, he wasnt going to be able to keep the house but can still live there for super cheap.

Better yet have them underwritten by a licensed 3rd party.