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types, roofing materials and roof pitch, and shall comply with the adopted <br />Citywide Design Guidelines. <br />(6) Historic Properties. If an accessory dwelling unit is to be constructed on <br />a parcel identified on the federal, state or local list of historic resources, <br />the accessory dwelling unit shall conform to the United States Secretary of <br />Interior's official Standards for the Treatment of Historic Properties. If the <br />proposed accessory dwelling unit is placed or constructed so as to result <br />in a modification of the existing historic resource on the parcel, a <br />certificate of appropriateness shall be issued by the Historic Resources <br />Commission upon the finding that the proposed accessory dwelling unit <br />conforms to the United States Secretary of Interiors official Standards for <br />the Treatment of Historic Properties and does not substantially change the <br />character and integrity of the historic property. <br />(7) Open Space. A minimum of one thousand two hundred (1,200) square <br />feet of usable, continuous, non -front yard open -space, excluding <br />driveways and parking areas, shall be provided. Any open space with a <br />minimum dimension of fifteen (15) feet by fifteen (15) feet shall be deemed <br />continuous open space. <br />(8) Passageway. No passageway shall be required in conjunction with the <br />construction of an accessory dwelling unit. For the purpose of this section, <br />'.passageway" shall mean a pathway that is unobstructed clear to the sky <br />and extends from a street to one entrance of the accessory dwelling unit. <br />Sec. 41-194.6 - Development Standards — Detached Accessory Dwelling Units. <br />Detached accessory dwelling units shall comply with all provisions in Sec. 41-194.5, in <br />addition to the following: <br />(t) Setbacks. The accessory dwelling unit shall comply with the front and <br />side yard setback standards prescribed in the zoning district, and shall <br />have a rear yard setback of not less than ten (10) feet. <br />(2) Maximum Height A detached accessory dwelling unit shall not exceed <br />fifteen (15) feet in height, as measured from the lowest adjacent grade of the <br />structure to the top of the structure. <br />(3) Separation. There shall be a minimum of fifteen (15) feet separation <br />between the primary dwelling unit and a detached accessory dwelling unit <br />and a minimum of five (5) feet between a detached accessory dwelling unit <br />and an accessory building. Separation shall be measured from the exterior <br />wall of the primary dwelling unit or attached structure to the nearest wall of <br />the accessory dwelling unit or attached structure. <br />Ordinance No. NS -2940 <br />Page 5 of 12 <br />11 A-23 <br />