THE SECRETARY OF THE INTERIORíS STANDARDS FOR
1. 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.
2. 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.
3. 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.
4. Most properties change over time; those changes that have acquired
historic significance in their own right shall be retained and preserved.
5. Distinctive features, finishes, and construction techniques or
examples of craftsmanship that characterize a historic property shall be
6. 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.
7. 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
8. Significant archeological resources affected by a project shall be
protected and preserved. If such resources must be disturbed, mitigation
measures shall be undertaken.
9. 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.
10. 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