I'm going to lease a space in a strip mall. I'm going to be putting up walls for offices. I've searched the web trying to find a list of requirements for interior walls but I'm not having any luck. Can anyone tell me if they have to be a certain distance from ceiling. The ceiling is a drop ceiling. If they go to the ceiling, do they have to go all the way to the roof? What about walls that separate my unit from my neighbors? Are they supposed to go all of the way up to roof? I'd ask the landlord but he doesn't seem to know much nor does he seem to be the type to follow codes to the T.