Except as otherwise provided in this section, a site having an area, frontage, width or depth, less than the minimum prescribed for the district in which the site is located, which is shown on a duly approved and recorded subdivision map, or for which a deed or valid contract of sale was of record prior to the adoption of this title, and which had a legal area, frontage, width and depth at the time that the subdivision map, deed or contract of sale was recorded, may be used for any permitted use listed for the district in which the site is located, but shall be subject to all other regulations for such district. (Ord. 622, 9-2-1980)