Continuation. Except as otherwise specially provided in this chapter, the lawful nonconforming use of land existing at the time of the adoption or amendment of this chapter may be continued although the use does not conform to the provisions of this chapter; provided, however, that:

Abolishment or replacement of existing nonconforming use. If such nonconforming use is discontinued or terminated for a period of 12 months, any future use of the structure, land or water shall conform to the provisions of this chapter. When a nonconforming use or structure is damaged by fire, explosion, flood, the public enemy or other calamity to the extent of more than 50% of its current assessed value, it shall not be restored except so as to comply with the use provisions of this chapter. Pursuant to § 62.23(7)(hc), Wis. Stats., a nonconforming structure damaged or destroyed by violent wind, vandalism, fire, flood, ice, snow, mold or infestation after March 2, 2006, may be restored to the size, location, and use that it had immediately before the damage or destruction occurred, with no limits on the costs of the repair, reconstruction, or improvement of said structure. The size of the restored structure may be larger than the size it was immediately before the damage or destruction if necessary for the structure to comply with applicable state or federal requirements.