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City of Portsmouth Zoning Ordinance Article IL — Zoning Districts Sec. 40.2 -206 — Historic Districts District - Specific Standards 11/6/2020 (a) Historic markers shall be made available to the owner of any building designated as a historic landmark. (b) The markers shall show the date of construction and the historic significance of the structure and shall be placed on the structure or adjacent to it. (c) It shall be unlawful for anyone to display an unauthorized marker or to remove an authorized marker without the prior consent of the structure owner and the City. (6) Conversion of Single- Family Detached Dwellings The conversion of existing single - family detached dwellings into two - family, three -to- four- family dwellings or multi- family dwellings is permitted within the Olde Towne, Port Norfolk, and Park View Historic Districts subject to a Use Permit (See Sec. 40.2 -533 Use Permits), and compliance with the following standards: (a) Construction Date Existing single- family detached dwellings may be converted in accordance with this section provided the original building existed prior to: (i) October 24, 1967 in the Olde Towne Historic District; (ii) April 26, 1983 in the Port Norfolk Historic District; and (iii) April 1, 1984 in the Park View Historic District. (b) Exterior Alterations Prohibited (i) Conversions completed in accordance with these provisions shall not result in any exterior additions to the structure. (ii) Any new building entrances shall be to the rear or side of the structure. (c) Minimum Floor Area After conversion, the floor area of each dwelling unit shall include a minimum of 600 square feet. (d) Maximum Number of Units The number of dwelling units permitted within a single structure shall be in accordance with Table 40.2 - 206(2) Maximum Number of Dwelling Units. (i) In the Olde Towne Historic District, any building larger than 5,000 square feet may be converted into additional dwelling units provided each dwelling unit contain at least 2,500 square feet. Page 24