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The ten
Secretary's of Interior Standards for Rehabilitation are to be applied to specific rehabilitation
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 be 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
addition, 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 manner that if removed in
the future, the essential form and integrity of the
historic property and its environment would be
unimpaired.
Key
Points
As stated
in the definitions of the Treatments
of Historic Properties the treatment
"rehabilitation" assumes that at least some
repair or alteration of the historic building will be
needed in order to provide for an efficient contemporary
use; however, these repairs and alteration must
not damage or destroy materials, features or finishes
that are important in defining the building's historic
character. For example, certain treatments -- if
improperly applied -- may cause or accelerate physical
deterioration of historic building.
This can include
using improper re-pointing or exterior masonry cleaning
techniques, or introducing insulation that damages
historic fabric. In almost all of these situations, use
of these materials and treatments will result in a
project that does not meet the Standards. Similarly,
exterior additions that duplicate the form, material,
and detailing of the structure to the extent that they
compromise the historic character of the structure
(confusing the viewer with what is historic and what is
new) will fail to meet the Standards.
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