|36 CFR 800: PART 800-PROTECTION OF HISTORIC AND CULTURAL PROPERTIES|
(a) An undertaking has an effect on a historic property when the undertaking may alter characteristics of the property that may qualify the property for inclusion in the National Register. For the purpose of determining effect, alteration to features of a property's location, setting, or use may be relevant depending on a property's significant characteristics and should be considered.
(b) An undertaking is considered to have an adverse effect when the effect on a historic property may diminish the integrity of the property's location, design, setting, materials, workmanship, feeling, or association. Adverse effects on historic properties include, but are not limited to:
(1) Physical destruction, damage, or alteration of all or part of the property;
(2) Isolation of the property from or alteration of the character of the property's setting when that character contributes to the property's qualification for the National Register;
(3) Introduction of visual, audible, or atmospheric elements that are out of character with the property or alter its setting;
(4) Neglect of a property resulting in its deterioration or destruction; and
(5) Transfer, lease, or sale of the property.
(c) Effects of an undertaking that would otherwise be found to be adverse may be considered as being not adverse for the purpose of these regulations:
(1) When the historic property is of value only for its potential contribution to archeological, historical, or architectural research, and when such value can be substantially preserved through the conduct of appropriate research, and such research is conducted in accordance with applicable professional standards and guidelines;
(2) When the undertaking is limited to the rehabilitation of buildings and structures and is conducted in a manner that preserves the historical and architectural value of affected historic property through conformance with the Secretary's ``Standards for Rehabilitation and Guidelines for Rehabilitating Historic Buildings'', or
(3) When the undertaking is limited to the transfer, lease, or sale of a historic property, and adequate restrictions or conditions are included to ensure preservation of the property's significant historic features.
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