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The Secretary of the Interior's Standards for Rehabilitation
The Secretary of the Interior's Standards for Rehabilitation are ten basic principles created to help preserve the distinctive character of a historic building and its site, while allowing for reasonable change to meet new needs.
The Standards (36 CFR Part 67) apply to historic buildings of all periods, styles, types, materials, and sizes. They apply to both the exterior and the interior of historic buildings. The Standards also encompass related landscape features and the building's site and environment as well as attached, adjacent, or related new construction.
Rehabilitation projects must meet the following Standards, as interpreted
by the National Park Service, to qualify as certified rehabilitations eligible for the 20% rehabilitation tax credit.
The Standards are applied to projects in a reasonable manner, taking into consideration economic and technical feasibility.
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A property shall be used for its historic purpose or be placed in a new
use that requires minimal change to the defining characteristics of the
building and its site and environment.
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The historic character of a property shall be retained and preserved. The
removal of historic materials or alteration of features and spaces that
characterize a property shall be avoided.
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Each property shall be recognized as a physical record of its time, place,
and use. Changes that create a false sense of historical development, such
as adding conjectural features or architectural elements from other buildings,
shall not be undertaken.
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Most properties change over time; those changes that have acquired historic
significance in their own right shall be retained and preserved.
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Distinctive features, finishes, and construction techniques or examples
of craftsmanship that characterize a historic property shall be preserved.
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Deteriorated historic features shall be repaired rather than replaced.
Where 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. Replacement
of missing features shall be substantiated by documentary, physical, or
pictorial evidence.
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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.
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Significant archeological resources affected by a project shall be protected
and preserved. If such resources must be disturbed, mitigation measures
shall be undertaken.
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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.
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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 property and its environment would be unimpaired.
More information about the treatment standards, including illustrated guidelines can be found on the Standards and Guidelines page.
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