In C4-1 Districts, for zoning lots having a lot area in excess of four acres, open off-street parking spaces which are accessory to commercial uses are not permitted obstructions within required open space.

In C4-1 Districts, for zoning lots having a lot area in excess of four acres, open space provided on the roof of a commercial building that would otherwise qualify as open space shall be subject to authorization by the City Planning Commission. In permitting such roof area to qualify as open space, the Commission shall find that:

(a)        the location and layout of the roof area is directly accessible, useable and restricted for the residential occupants and their guests for whom no admission charge or membership fee is charged;

(b)        such roof area contains recreational facilities, seating areas and landscaping; and

(c)        all mechanical equipment or emissions therefrom are screened and no intake or exhaust duct faces directly into the open space.