No building shall hereafter be erected and no existing building
shall be moved, structurally altered, rebuilt, added to or enlarged
nor shall any land be used for any purpose other than those included
among the uses listed as permitted uses in each zone by this chapter
and meeting the requirements set forth in the appended Schedule. No open space contiguous to any building shall be encroached
upon or reduced in any manner, except in conformity with the area
and bulk requirements, off-street parking requirements and all other
regulations designated in the Schedule and this chapter for the zone
district in which such building or space is located. In the event
of any such unlawful encroachment or reduction, such building or use
shall be deemed to be in violation of this chapter, and the certificate
of occupancy shall become void.