In Manufacturing Districts, a minimum area shall be utilized for landscaping and building setting and shall consist of a lawn, shrubbery, trees, ground cover, decorative paving or combinations thereof, maintained in good condition, and may include those areas required for screening, but excluding accessory off-street parking, loading and storage areas.
(a) In M-1 Districts - fifteen percent of the zoning lot.
(b) In M-2 Districts - ten percent of the zoning lot.