No building shall hereafter be erected and no
existing building shall be moved, structurally altered, rebuilt, added
to or enlarged, nor shall any building or land area be used for any
purpose other than those included among the uses listed as permitted
uses in each zone district of this chapter and meeting the requirements
set forth herein. Open space contiguous to any building shall not
be encroached upon or reduced in any manner, except in conformity
to the area and bulk requirements, off-street parking requirements
and all other regulations required by 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 or certificate of compliance, as appropriate, shall become
null and void.