Nothing in this chapter shall prevent the reconstruction, repairing, rebuilding and continued use of any nonconforming building and/or infrastructure damaged by fire, collapse, explosion or acts of God, subsequent to the date of this chapter, wherein the extent of such damage does not exceed 60% of the gross value of the property, as determined by a licensed insurance examiner in the Commonwealth of Pennsylvania, at the time such damage occurred. If such damage does exceed 60% of the gross value of the property, reconstruction will have to be done to bring the property into conformance with this chapter within one year.