Historic Preservation Commission Agenda and Packet 2011 07 18

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as adding conjectural features or architectural elements from other buildings, shall not be undertaken. d.Most properties change over time; those changes that have acquired historic significance in their own right shall be retained and preserved. e.Distinctive features, finishes and construction techniques or examples of craftsmanship that characterize a property shall be preserved. f.Deteriorated historic features shall be repaired rather than replaced. When the severity of deterioration requires replacement of a distinctive feature, the new feature shall match the old in design, color, texture and other visual qualities and, where possible, materials. In the replacement of missing features, every effort shall be made to substantiate the structure's historical features by documentary, physical, or pictorial evidence. g.Chemical or physical treatments, such as sandblasting, that cause damage to historic materials shall not be used. The surface cleaning of structures, if appropriate, shall be undertaken using the gentlest means possible. h.Significant archaeological resources affected by a project shall be protected and preserved. If such resources must be disturbed, mitigation measures shall be undertaken. i.New additions, exterior alterations or related new construction shall not destroy historic materials that characterize the property. The new work shall be differentiated from the old and shall be compatible with the massing, size, scale, and architectural features to protect the historic integrity of the property and its environment. j.New additions and adjacent or related new construction shall be undertaken in such a manner that if removed in the future, the essential form and integrity of the historic propertyand its environment would be unimpaired. Staff acknowledges the proposed improvement is required to continue with the improvement to drainage issues previously identified. The existing porch roof does not provide the necessary drainage relief and must beremoved or repaired. The design proposed by the contractor may not be architecturally accurate for the age of the structure. The primary structure was built in 1905, but the porched area and the addition on the east side of the structure appears to be from a later time period, possibly the 1940’s. The proposed porch design has a gable end withVictorian post and baluster details. This design approach does not coincide with the existing design or age of the structure. Staff recommends the contractorwork with an HPC architect toredesign the porch to match the 1940’s addition with a more non-descript porch design -the gable end may remain but the posts and balusters should be designed to match the 1940’saddition. 4