Where a lawful structure exists at the effective date of adoption or amendment of this chapter that could not now be built under the terms of this chapter by reason of restrictions on area, lot coverage, height, yards, its location on the lot, bulk or other requirements concerning the structure, such a structure may be continued so long as it remains lawful, subject to the following provisions.
   (A)   The non-conforming structure may not be enlarged or altered in any way which increases its non-conformity, but any structure or portion thereof may be altered to decrease its non-conformity.
   (B)   If a non-conforming structure or non-conforming portion of a structure is destroyed by any means to the extent of more than 51% of the fair market value of the building immediately prior to the damage, it shall not be reconstructed, except in conformity with the provisions of this chapter.
   (C)   If a structure is moved for any reason for any length of distance, it shall thereafter conform to the regulations for the district in which it is located after the move.
(2004 Code, § 7-104)