The existing use, or uses, of all buildings, improvements and premises not in conformity with the standards or requirements of the land use zoning district in which they are located, in accordance with the provisions of this title, and which uses are legal, or for which permits, variances or conditional exceptions were granted under previous zoning ordinances, may continue as nonconforming uses or variances, as defined in this title, and subject to the provisions regulating such nonconforming uses. (Ord. 1000 § 4, 1955)