I had always operated in a manner fully compliant with current direction, have clear disclosure, conversations and written defined contracts with buyers detailing exactly what comissions would be and how they'd work out, etc etc. 

If you have any doubts or questions, it’s always best to consult an attorney to ensure you’re compliant with fair housing laws.

Consulting with legal and financial advisors will help ensure your lending practices are compliant and secure.

This is mostly so I can seamlessly stay legally compliant.

Marketing you need to be very careful again as you have to be compliant with all laws and regulations7.

I would love to know if there were a compliant way to offer shorter stays. 

"Modular" structures are allowed to get a CofO in the US if they're IBC/IRC compliant -- which requires someone to do code compliance checks on the factory floor.

However, this type of offering while least costly and fastest has some big disadvantages, mainly (1) provides the sponsor with almost no protection from being sued by disgruntled investors and (2) investors with any savvy will only invest in offerings where the offering is compliant with Reg D.Reg D is a “safe harbor” requiring the offering to be FILED, not REGISTERED with the SEC.  

@Joseph Chiofalo  The properties that have conventional loans are in personal names (can't hold them in LLC and be compliant with Fannie/Freddie requirements to be best of my knowledge).  

So, that is also a viable, safe and code compliant option.