If the footings were sized correctly, enough were installed AND put in deep enough to be below the frost line then there shouldn't be any reason to see them moving. So something wasn't done right and therefore you're problem exists. Being on a steep grade with bad footings,
!
Yeah you need to do your homework. Fixing the footings is the last of your concerns if what's there isn't grandfathered and you'd need to tear it down to meet current SPA guidelines. Since the building is partially finished could that be an issue? Dunno, but something I'd want to know right off the bat.