For the purpose of calculating motor vehicle parking stalls, bicycle parking stalls and loading stalls, the total horizontal area of every enclosed floor and mezzanine used exclusively by a single use area in a building, and is measured from the exterior face of the exterior wall and the centre line of an interior partition wall that separates at least two uses, but does not include:
(a) elevator shafts;
(c) crawl spaces;
(d) mechanical or electrical rooms;
(e) indoor garbage or recycling storage;
(f) areas used for parking and loading;
(g) areas below grade used for storage and not accessible to the public; and
(h) common corridors and halls available to more than one use.