Does an Accessory Dwelling Unit count as Owner Occupancy?

[Cameron Price]

I'm looking into buying a quadplex to owner occupy. I've been reading about FHA loans and owner occupancy requirements on here.

I'm a fan of tiny homes. I currently live in 280 sf and have almost zero expenses as far as primary residence is concerned. 

I've done some research on Accessory Dwelling Units as well. 

How does that work in a quadplex? If i purchased a quadplex and had an ADU on the property that I ACTUALLY live in, am I within the law? I have a very sensitive consience, so I'm trying to figure out what constitutes legal occupancy.

Does an ADU count as an addiional unit, making it a multifamily? Or am i within the law and could rent all 4 units and occupy the ADU?