A nonconforming structure shall be subject to the following regulations:

A. If a nonconforming structure is destroyed by any means to the extent of fifty percent or more of its replacement value at that time, the structure may be rebuilt or repaired only if the resultant structure is in complete conformance with the regulations of the district in which it is located, provided, however, that the foregoing provision does not apply if the owner of the structure at the time of destruction rebuilds a comparable structure within twelve months of the destruction.

B. Any nonconforming structure may be continued so long as it remains otherwise lawful, subject to the provision that no such structure may be enlarged or altered in a way which increases its nonconformity. (Zoning ordinance dated 6/3/03 § 14-3.0)