A nonconforming building, structure, sign or parcel of land, or the use thereof, which exists by virtue of a variance or a special use permit (or a special exception) granted by the Board, shall not be considered a nonconformance for the purposes of this article and shall not acquire the rights of this article. Rather, such building, structure, sign or parcel of land, or use thereof, shall be considered a use by variance or a use by special use permit and any moving, addition, enlargement, expansion, intensification or change of such building, structure, sign or parcel of land, or use thereof, to any use other than a permitted use or other than in complete conformance with this chapter, shall require a further variance or special use permit from the Board.