Where a lawful structure exists on November 20, 1975 or on the effective date of any applicable amendment of this chapter, that could not be built under the terms of this chapter by reason of restrictions on area, lot coverage, height, yards, its location on the lot or other requirements concerning the structure, such structure may be continued so long as it remains lawful, subject to the following provisions:
(a) No such non-conforming structure may be enlarged or altered in a way which increases its non-conformity, but any structure or portion thereof may be altered to decrease its nonconformity.
(b) Should such non-conforming structure or non-conforming portion of structure be destroyed by any means to an extent of more than 50% of its replacement cost at the time of destruction, it shall not be reconstructed, except in conformity with the provisions of this chapter.
(c) Should such structure be moved for any reason for any distance whatever, it shall thereafter conform to the regulations for the district in which it is located after it is moved.
(d) Any such non-conforming structure located on a lot adjacent to the Atlantic Ocean or sound waters may be moved to the same lot; provided, that such movement does not increase the non-conformity of the structure in any way. (11-20-75, art. 5, 5.02)