No required Yard, Landscaping, or Recreation Space around an existing Building, or which is hereafter provided around any Building for the purpose of complying with the provisions of this Title, shall be considered as providing a Yard, Landscaping, or Recreation Space for any other Building; nor shall any Yard, Landscaping, or Recreation Space on an adjoining Lot be considered as providing a Yard, Landscaping, or Recreation Space on a Lot whereon a Building is to be erected or established. This Section shall be so construed to mean only one Primary Building may be permitted on one Lot, unless otherwise hereinafter provided.