The use of all land and every building or portion of a building erected, altered with respect to height and area, added to or relocated and every use within a building or use accessory thereto in the Borough of Pitman shall be in conformity with the provisions of this chapter. Any existing building or structure and any existing use of building or land not in conformity with the regulations herein prescribed shall be regarded as nonconforming but may be continued, extended or changed subject to the special regulations with respect to nonconforming buildings or uses as provided in § 35-22.