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a. The Board of Trustees shall issue an alteration certificate for any proposed work on a designated historical site or district only if the Board of Trustees determines that the proposed work would not detrimentally alter, destroy or adversely affect any architectural or landscape feature which contributes to the original historical designation. The Board of Trustees must find that a proposed development is visually compatible with designated historic structures located on the property in terms of design, finish, material, scale, mass and height. When the subject site is an historic district, the Board of Trustees must also find that the proposed development is visually compatible with the development on adjacent properties. For purposes of this Section, the term compatible shall mean consistent with, harmonious with and/or enhances the mixture of complementary architectural styles, either of the architecture of an individual structure or the character of the surrounding structures.

b. The Board of Trustees will use the following criteria to determine compatibility:

1. The effect upon the general historical and architectural character of the structure and property.

2. The architectural style, arrangement, texture and material used on the existing and proposed structures and their relation and compatibility with other structures.

3. The size of the structure, its setbacks, its site, location and the appropriateness thereof when compared to existing structures and the site.

4. The compatibility of accessory structures and fences with the main structure on the site and with other structures.

5. The effects of the proposed work in creating, changing, destroying or otherwise impacting the exterior architectural features of the structure upon which such work is done.

6. The condition of existing improvements and whether they are a hazard to public health and safety.

7. The effects of the proposed work upon the protection, enhancement, perpetuation and use of the property.

8. Compliance with the Secretary of the Interior’s Standards for Rehabilitation as listed below:

(a) 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.

(b) 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.

(c) 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.

(d) Most properties change over time; those changes that have acquired historic significance in their own right shall be retained and preserved.

(e) Distinctive features, finishes and construction techniques or examples of craftsmanship that characterize a property shall be preserved.

(f) Deteriorated historic features shall be repaired rather than replaced. When 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.

(g) 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.

(h) Significant archaeological resources affected by a project shall be protected and preserved. If such resources must be disturbed, mitigation measures shall be undertaken.

(1) New additions, exterior alterations or related new construction shall not destroy historic materials that characterize the property. To protect the historic integrity of the property and its environment, the new work shall be differentiated from the old and shall be compatible with the massing, size scale and architectural features.

(2) 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.