No lot, yard, court, parking area or other space shall be reduced in area or dimension so as to make the area or dimension less than the minimum required by this Zoning Code. No part of a yard, court, parking area or other space provided about or for any building or structure for the purpose of complying with the provisions of this chapter, shall be included as part of the yard, court, parking area or other space required under this chapter for another building or structure. Furthermore, no part of a yard, court, parking area or other space provided which is already less than the required minimum shall be reduced further.