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 Schedule of Permitted Uses and Requirements. No open space contiguous to any building shall be encroached upon or reduced in any manner, except in conformity to the requirements for yard, lot area, building location, percentage of building coverage, off-street parking and loading, 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 any building permit or other permit, if issued shall become void.