Where a lawful structure exists at the effective date of adoption or amendment of this Zoning Ordinance that could not be built under the terms of this Zoning Ordinance by reason of restrictions on area, lot coverage, height, yards, location on the lot, bulk, or other requirements concerning the structure, such structure may be continued so long as it remains otherwise
lawful, subject to the following provisions:
(a) No such nonconforming structure shall be enlarged or altered in a way which increases its nonconformity, but any structure or portion thereof may be altered to decrease its nonconformity. Changes to nonconforming structures shall be oriented toward making the non-conformity more in character with its surroundings;
(b) Should such nonconforming structure or nonconforming portion of a structure be destroyed by any means, it shall not be reconstructed except in conformity with the provisions of this Zoning Ordinance;
(c) Any maintenance, repair, replacement, or restoration activities shall not increase the number or extent of nonconformities; and
(d) Should such structure be moved for any reason for any distance whatsoever, it shall thereafter conform to the regulations for the district in which it is located after it is moved.