Destruction and restoration. If any building or structure in which a nonconforming use is conducted is hereafter removed, or destroyed by fire, wind, explosion, structural failure or other natural cause, to the extent of 75% for more of its fair market value at the time of such damage, reconstruction for restoration of the nonconforming use must be completed within one year or the use shall expire and terminate; provided, however, that if reconstruction has commenced within the one-year period, the owner may apply to the Zoning Enforcement Officer for an extension of time, not to exceed one additional year, in which to restore the existing, nonconforming use.