Any lot shown upon an official subdivision map duly approved and recorded, any lot for which a deed was of record, any lot shown by a separate number or letter on a record of survey map filed with the County Recorder, and any lot for which a contract of sale was in full force and effect on May 23, 1939, may be used as a building site.
('65 Code, § 9-3.1503) (Ord. 556, passed - - )