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The HPC, the Board of Appeals, the Board of Supervisors, the Planning Commission, and the Department shall be governed by the following standards in the review of applications for Permits to Alter. In the case of conflict with other requirements, including the requirements of Article 10, the more restrictive standards shall apply.
(a) The proposed alteration shall be consistent with and appropriate for the effectuation of the purposes of this Article 11.
(b) The proposed work shall comply with the Secretary of the Interior's Standards for the Treatment of Historic Properties for significant and contributory buildings, as well as any applicable guidelines, local interpretations, bulletins, or other policies. Development of local interpretations and guidelines based on the Secretary of the Interior's Standards shall be led by the Planning Department through a public participation process; such local interpretations and guidelines shall be found in conformance with the General Plan and Planning Code by the Planning Commission and shall be adopted by both the HPC and the Planning Commission. If either body fails to act on any such local interpretation or guideline within 180 days of either body's initial hearing where the matter was considered for approval, such failure to act shall constitute approval by that body. In the case of any apparent inconsistency among the requirements of this Section, compliance with the requirements of the designating ordinance shall prevail.
(c) For Significant Buildings - Categories I and II, and for Contributory Buildings - Categories III and IV, proposed alterations of structural elements and exterior features shall be consistent with the architectural character of the building, and shall comply with the following specific requirements:
(1) The distinguishing original qualities or character of the building may not be damaged or destroyed. Any distinctive architectural feature which affects the overall appearance of the building shall not be removed or altered unless it is the only feasible means to protect the public safety.
(2) The integrity of distinctive stylistic features or examples of skilled craftsmanship that characterize a building shall be preserved.
(3) Distinctive architectural features which are to be retained pursuant to Paragraph (1) but which are deteriorated shall be repaired rather than replaced, whenever possible. In the event replacement is necessary, the new material shall match the material being replaced in composition, design, color, texture and other visual qualities. Repair or replacement of missing architectural features shall be based on accurate duplication of features, substantiated by historic, physical or pictorial evidence, if available, rather than on conjectural designs or the availability of different architectural elements from other buildings or structures. Replacement of nonvisible structural elements need not match or duplicate the material being replaced.
(4) Contemporary design of alterations is permitted, provided that such alterations do not destroy significant exterior architectural material and that such design is compatible with the size, scale, color, material and character of the building and its surroundings.
(5) The degree to which distinctive features need be retained may be less when the alteration is to exterior elements not constituting a part of a principal facade or when it is an alteration of the ground-floor frontage in order to adapt the space for ground-floor uses.
(6) In the case of Significant Buildings - Category I, any additions to height of the building (including addition of mechanical equipment) shall be limited to one story above the height of the existing roof, shall be compatible with the scale and character of the building, and shall in no event cover more than 75 percent of the roof area.
(7) In the case of Significant Buildings - Category II, a new structure or addition, including one of greater height than the existing building, may be permitted on that portion of the lot not restricted in Appendix B even if such structure or addition will be visible when viewing the principal facades at ground level, provided that the structure or addition does not affect the appearance of the retained portion as a separate structure when so viewing the principal facades and is compatible in form and design with the retained portion. Alteration of the retained portion of the building is permitted as provided in Paragraphs (1) through (6) of this Subsection (c).
(d) Within Conservation Districts, all major exterior alterations, of Category V Buildings, shall be compatible in scale and design with the District as set forth in Sections 6 and 7 of the Appendix which describes the District.
(e) If TDR have been transferred from any Contributory Building, the building shall be subject to the same restrictions on alterations as a Significant Building. These restrictions may not be removed by the transfer of TDR back to the building.
(Added by Ord. 414-85, App. 9/17/85; amended by Ord. 95-12, File No. 120301, App. 5/21/2012, Eff. 6/20/2012)
Undesignated introductory paragraph amended; new division (b) added and former divisions (c) and (d) redesignated accordingly; division (e) added; Ord. 95-12, Eff. 6/20/2012.