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 50% 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 nonconforming 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.