No building or structure shall hereafter be erected, and no existing building or structure shall be moved, structurally altered, added to, enlarged or rebuilt, nor shall any land be designed, used or intended to be used for any purpose other than those included among the uses listed as permitted uses in each zone, or in accordance with a variance granted pursuant to N.J.S.A. 40:55D-70 et seq., nor shall any open space contiguous to any building be encroached upon or reduced in any manner, except in conformity with the yard, lot area, building location, percentage of lot coverage, off-street parking space and such other regulations designated in this chapter for the zone in which such building or space is located, or in accordance with a variance granted pursuant to N.J.S.A. 40:55D-70 et seq. In the event of any such unlawful encroachment or reduction, such building shall be deemed to be in violation of the provisions of this chapter, and no certificate of occupancy shall be issued therefor.