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Secretary of Interior Standards
Secretary of the Interior’s Standards for Rehabilitation

  1. A property will be used as it was historically or be given a new use that requires minimal    change   to   its   distinctive   materials,   features,   spaces,   and   spatial relationships.
  2. Each property will be recognized as a physical record of its time, place, and use.
  3. Changes that create a false sense of historical development, such as adding conjectural  features  or  elements  from  other  historic  properties,  will  not  be undertaken.
  4. Changes to a property that have acquired historic significance in their own right will be retained and preserved.
  5. Distinctive materials, features, finishes, and construction techniques or examples of craftsmanship that characterize a property will be preserved.
  6. Deteriorated  historic  features  will  be  repaired  rather  than  replaced.  Where  the severity  of  deterioration  requires  replacement  of  a  distinctive  feature,  the  new feature will match the old in design, color, texture, and, where possible, materials. Replacement of missing features will be substantiated by documentary and physical evidence.
  7. Chemical or physical treatments, if appropriate, will be undertaken using the gentlest means possible.   Treatments that cause damage to historic materials will not be used.
  8. Archeological resources will be protected and preserved in place. If such resources must be disturbed, mitigation measures will be undertaken.
  9. New additions,  exterior  alterations,  or  related  new  construction  will  not  destroy historic materials, features, and spatial relationships that characterize the property. The new work will be differentiated from the old and will be compatible with the historic materials, features, size, scale and proportion, and massing to protect the integrity of the property and its environment.
  10. New additions and adjacent or related new construction will 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.