When a building in which a nonconforming use is conducted, or which is itself nonconforming as to size, coverage, or location on the lot, is damaged or destroyed by fire, explosion, act of God or catastrophe not brought about by or on behalf of the owner, lessee or other person in possession and control of said nonconforming building, it may be restored or reconstructed and used for said nonconforming use provided that: 1. the restored or reconstructed building covers no greater area, has no greater cubic content, and is at least as conforming as to location on the lot as was the building damaged or destroyed and 2. in case of destruction of the building, a Class A-2 survey is filed with the Clerk of the Borough of Newtown, depicting its location on the lot, such survey to be filed at or before the time an application to demolish the building is filed. The foregoing notwithstanding, any such nonconformity shall be lost unless restoration or reconstruction, as the case may be, is substantially started within the later of two years from the date public sewers are available according to the plan adopted by the WPCA as of the effective date of this revision or one year from the original damage or destruction or unless the building is demolished and a Class A-2 survey is filed with the Clerk of the Borough as stated above.