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In all districts, as indicated, notwithstanding the provisions of Section 23-22 (Maximum Number of Dwelling Units), one single-family detached residence or, where permitted, one single-family residence, may be built upon a zoning lot consisting entirely of a tract of land that was owned separately and individually from all other adjoining tracts of land, both on December 15, 1961, and on the date of application for a building permit.