When a lot is improved with a dwelling the intensity of use regulations shall be the same as those required in the A residence district. When living facilities are erected above stores there shall be a lot area per family of not less than three thousand (3,000) square feet. Where a lot of record contains less than three thousand (3,000) square feet it may contain living facilities for not more than one family. (Ord. 215, 9-17-1962)