As used in this part:
(a) “Complex” means any group of buildings located on a single parcel of land or on contiguous parcels of land or any building or group of buildings which are subdivided into separate occupancies and planned, financed, constructed or promoted by common management for the purpose of sale or lease of the entire complex or any subdivision thereof, except any single-family detached dwelling;
(b) “Street floor” means the floor nearest the level of exit discharge; and
(c) “Story” means that part of a building comprised between a floor and the floor or roof next above.