(a) Continued Conformity with Bulk Regulations. The maintenance of yards and other open space and minimum lot area legally required for a building shall be continuing obligation of the owner of such building or of the property on which it is located, as long as the building is in existence. Furthermore, no legally required yards, other open space, or minimum lot area allocated to any building shall, by virtue of change of ownership or for any other reason, be used to satisfy yard, other open space, or minimum lot area requirements for any other building.
(b) Division of Zoning Lots. No improved zoning lot shall hereafter be divided into two or more zoning lots and no portion of any improved zoning lot shall be sold, unless all zoning lots resulting from each such division or sale shall conform with all the applicable size regulations of the zoning district in which the property is located.
(c) Location of Required Open Space. All yards and other open spaces allocated to a building or dwelling group shall be located on the same zoning lot as such building or dwelling group.
(d) Required Yards--Existing Buildings. No yards, now or hereafter provided for a building existing on the effective date of this Ordinance, shall subsequently be reduced below, or further reduced if already less than, the minimum yard requirements of this Ordinance for equivalent new construction.