For buildings containing residences, the area in such buildings occupied by non-residential uses on the ground floor, or within two feet of the as-built level of the adjoining sidewalk, shall be excluded from the calculation of permitted floor area in the building. However, the area occupied by non-residential uses on the ground floor shall be included as floor area for other purposes including calculating:

(a)        requirements for accessory off-street parking spaces;

(b)        accessory off-street loading berths;

(c)        limitations on floor area occupied by certain uses; and

(d)        satisfying requirements for FRESH food stores as defined in Article VI, Chapter 3, and the special floor area regulations of that Chapter.