Certain lots or parcels of land, as specified hereinafter, may be used as building sites, provided any building, structure, or addition is itself conforming, even though the area and or the median lot width thereof is less than that required by the district in which such lot or parcel of land is situated, if all other requirements for that district are met. This exception applies in each of the following cases; provided, however, that in no case shall it apply to a lot or parcel of land having an area less than four thousand (4,000) square feet or having a median lot width less than forty (40) feet:

    A.    Any lot indicated on a recorded subdivision map prior to August 2, 1946, provided however, this subsection shall not apply to such lots located within zoning districts requiring minimum building site area of one acre or more unless a building permit for a single-family dwelling to be constructed thereon had been filed by March 1, 1977.

    B.    Any parcel of land shown as a lot on the records of the county recorder as separately owned and assessed prior to August 2, 1946, when the present owner thereof is not the owner of any adjacent land;

    C.    Any lot having an area of five thousand (5,000) square feet or more, which is indicated upon a recorded subdivision map, provided however, this subsection shall not apply to such lots located within zoning districts requiring minimum building site area of one acre or more unless a building permit for a single-family dwelling to be constructed thereon had been filed by March 1, 1977.

    D.    Any lot where the deficiency in area or median lot width is due exclusively to the condemnation of a portion thereof for a public purpose, or the sale of any such portion to any agency or political subdivision of the state or of the federal government and where such deficiency does not exceed twenty-five (25) percent of the district’ s requirement;

    E.    Any lot in a combining B district, when the owner thereof owns no adjacent land when the lot was of record prior to the adoption of said B district; provided, however, that unless the lot is also covered under one or more of the preceding subsections of this section, the use thereof shall conform to the median lot width and the yard requirements of the district with which said B districts is combined;

    F.    Any lot in an A district which contained a minimum of five acres, median lot width of at least three hundred (300) feet, and an effective lot frontage of at least one-half the actual median lot width, which was shown as a lot on the records of the county recorder as separately owned and assessed prior to May 4, 1972, when the present owner thereof is not the owner of any adjacent land;

    G.    Any lot in an A district which contains a minimum of fifty (50) acres which was shown as a lot on the records of the county recorder as separately owned and assessed prior to May 4, 1972, when the owner thereof owns no adjacent land and which lot has effective lot frontage on an approved private street.

    H.    Yards Reduced by Condemnation. Wherever a lot hereafter becomes qualified as a building site under the provisions of subsection D of this section, any yard about an existing building thereon which becomes deficient in depth or in width solely because of such condemnation or sale of a portion of the lot shall thereafter be deemed to be a yard conforming to these regulations, and shall not of itself cause the building to become a nonconforming building. (Prior gen. code § 8-60.14--8-60.15)