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In the districts indicated, the open space required for a residential building or the residential portion of a mixed building under the provisions of Section 35-32 (Open Space Ratio for Residential Portions of Buildings) may be at a level higher than 23 feet above curb level. Such open space may be provided at ground floor level or upon the roof of:

(a)        the non-residential portion of a mixed building;

(b)        a commercial building; or

(c)        a community facility building that abuts such residential building or residential portion of a mixed building;

provided that the level of any open space may not be higher than 2 feet, 6 inches below the sill level of any legally required window opening on such roof area, in the residential portion of such mixed building. Open space located on the roof of a community facility building separated by open area from residential or mixed buildings on the same zoning lot may not be at a level higher than 23 feet above curb level.