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In the districts indicated, the zoning lots containing residences shall have a minimum open space ratio as required under the provisions of Article II, Chapter 3. For the purposes of this Section:

(a)        the floor area counted in determining the open space ratio shall be only that floor area in the residential portion of the building;

(b)        the lot coverage of the residential portion of the building shall be deemed to be that portion of the zoning lot which, when viewed directly from above, would be covered by the residential portion of the building at any level; and

(c)        the applicable height factor, if the maximum permitted residential floor area ratio is less than the total floor area ratio permitted for such zoning lot, shall be the height factor of the residential portion of the building.