Two, (not mutually exclusive) approach’s.  

Two long answers are here:https://www.biggerpockets.com/forums/51/topics/1088325-expla...https://www.biggerpockets.com/forums/51/topics/998718-explai...

(FYI - this was an SB9 "two unit development, not an SB9 lot split). 

A third party company that integrates with our system.

The pref layer is a third party institutional player.  

Alba v Jean-claude Kaufmann :: 2006 :: New York Appellate Division, Third Department Decisions :: New York Case Law :: New York Law :: US Law :: Justia This decision gives an excellent explanation of when specific performance might be denied.EMF Gen.

Maybe seller financing.But let me ask this question, what happens if in the third month the furnace goes and needs $2000 worth of repairs?

For example, I looked at one tri-plex that had recently been remodeled with two units being 2/2 @1000 sq feet renting for $2,000 per unit and the third being a 2/1 renting for $1750 asking price of $850K. 

An LLC is useful for two things: anonymity and legal protection.

Whether it's completing paperwork or obtaining third-party accredited verifications, attention to detail is paramount.Never assume that raising equity will be easy.