Destruction and restoration. If any structure in which a nonconforming
use is conducted is hereafter damaged, removed, or destroyed by fire,
wind, explosion, or other natural cause, to the extent of 75% or more
of its fair market value at the time of such damage, application for
any reconstruction or restoration of such structure for a building
permit, to resume the non-conforming use shall be made within one
year and the structure for the nonconforming use shall be constructed
within one additional year unless the permit is renewed.