Secretary of the Interior's Standards for the Treatment of Historic Properties
The Secretary of the Interior Standards and Guidelines for historic rehabilitation were written by the National Park Service and revised in 1990. They are federally mandated to be utilized by federal agencies with designated properties or properties that are officially determined to be eligible for National Register listing by the Colorado State Historic Preservation Office. They have also been adopted by numerous in State Certified Local Governments. The guidelines recommend responsible methods and approaches and list treatments that should be avoided.