Where a side lot line of a zoning lot containing manufacturing or commercial uses coincides with the side or rear lot line of a zoning lot containing residential uses, enlargements or developments shall provide an open area not at any point more than five feet above nor five feet below curb level, and at least 15 feet wide.

Where the rear lot line of a zoning lot containing manufacturing or commercial uses coincides with a side lot line of a zoning lot containing residential uses, enlargements or developments shall provide an open area not at any point more than five feet above nor five feet below curb level, and at least 20 feet in depth.

Where a zoning lot containing manufacturing or commercial uses shares a common rear lot line with a zoning lot containing residential uses, enlargements or developments shall provide an open area not at any point more than five feet above nor five feet below curb level, and at least 30 feet in depth. Such open areas shall not be used for accessory off-street parking, accessory off-street loading, or for storage or processing of any kind.