Where a public plaza is located on a zoning lot divided by a district boundary, the floor area bonus for such public plaza may be credited to either portion of the zoning lot regardless of the public plaza's location or the date when the zoning lot was created, provided that the amount of such bonus permitted on either portion of the zoning lot shall not exceed the maximum amount that would be permitted on such portion if it were a separate zoning lot and subject to all other applicable provisions of Article VII, Chapter 7.