With the exception of a multifamily residence, if seventy-five percent (75%) or less of the value of a nonconforming building above its foundation is damaged by fire, flood, explosion, wind, earthquake, war, riot or other calamity or act of God, it may be restored, reconstructed or used as before; provided, that such reconstruction shall be started within six (6) months of such happening and prosecuted to completion within one (1) year of such happening. If more than seventy-five percent (75%) is damaged, by any means, it shall be restored or reconstructed and used, subject to and in conformance with all the regulations specified by this Title, including but not limited to the regulations of the zoning district in which the building is located. The value of a building shall be determined by the County Tax Assessor records.