If a building, structure or property occupied by a nonconforming use is damaged or destroyed, by any means not within the control of the property owner or tenant, to an extent of fifty percent (50%) or less of the replacement value, it may be repaired, reconstructed or restored provided that no new nonconformities are created and that the existing degree of nonconformity is not increased. A building permit must be obtained for such rebuilding, restoration, repair or reconstruction within six (6) months of the date of damage or destruction, and the construction must be initiated within one (1) year of issuance of the building permit, and diligently pursued. If a building permit is not obtained within six (6) months, then the building and/or structure and use may be reestablished only if it complies with all regulations of the district in which it is located.