The following standards shall be used by the officer in
certifying proposed or completed rehabilitation work to an historic
(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
(2) The historic
character of a property shall be retained and preserved. The removal or
alteration of features and spaces that characterize a property shall be
(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
(4) Changes that have
acquired historic significance in their own right shall be retained and
features, finishes, and construction techniques or examples of craftsmanship
that characterize a property shall be preserved.
(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
(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 unimpaired.