Extension

No nonconforming use shall hereafter be made of any land, building or structure which otherwise conforms to the provisions of this ordinance, nor shall any nonconforming use be expanded or extended into other conforming land, building or structure or portion thereof, except as hereafter provided. The zoning board of review may grant, as a special use permit under the provisions of article V, permission for the extension or enlargement of a nonconforming use up to twenty-five (25) percent of the size of the building or structure thus used. Such an extension or enlargement shall be granted only once, and shall be subject to any safeguards or restrictions deemed appropriate by the board. Any other legal nonconforming use of any parcel of land shall not be extended beyond that portion of the lot thus used unless a use variance is granted by the board under the provisions of article IV.