Restoration shall be considered the most appropriate treatment of an historical property: when the property's design, architectural, or historical significance during a particular period of time outweighs the potential loss of extant materials, features, spaces, and finishes that characterize other historical periods; where there is substantial physical and documentary evidence for the work; and when contemporary alterations and additions are not planned. Prior to undertaking restoration, a particular period time, i.e., the restoration period, should be selected and justified and a documentation plan for restoration developed. Consistent with §
42-20, the following standards for restoration shall apply:
A. A property will be used as it was historically or be given a new use which reflects the property's restoration period.
B. Materials and features from the restoration period will be retained and preserved. The removal of materials or alteration of features, spaces, and spatial relationships that characterize the period will not be undertaken.
C. Each property will be recognized as a physical record of its time, place, and use. Work needed to stabilize, consolidate and conserve materials and features from the restoration period will be physically and visually compatible, identifiable upon close inspection, and property documented for future research.
D. Materials, features, spaces and finishes that characterize other historical periods will be documented prior to their alteration or removal.
E. Distinctive material, features, finishes, and construction techniques or examples of craftsmanship that characterize the restoration period will be preserved.
F. Deteriorated features from the restoration period will be repaired rather than replaced. Where the severity of deterioration requires replacement of a distinctive feature, the feature being replaced will match the feature in original design, color, texture, and, where possible, materials.
G. Replacement of missing features from the restoration period will be substantiated by documentary and physical evidence. A false sense of history will not be created by adding conjectural features, features from other properties, or by commingling features that never existed together historically.
H. Chemical or physical treatments, if appropriate, will be undertaken using the gentlest means possible. Treatments that cause damage to historical materials will not be used.
I. Archaeological resources affected by a project will be protected and preserved in place. If such resources must be disturbed, mitigation measures will be undertaken in accordance with a plan reviewed and approved by the Historic Preservation Commission.
J. Designs that were never executed historically will not be permitted to be constructed.