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C. Renovation and Additions Renovation is the modification of a structure which does not alter the general massing while an addition is a change in mass. A modification which involves the removal of a part of the landmark should be considered under demolition (see Demolition). Additions to landmarks should not detract from the original forri and unity of the landmark and should riot cover singular examples of architectural detail. Additions to landmarks should be added in a manner that does not disrupt the visible unity or overall appearance of the site. The proportions, materials and ratios of the existing structures should be carried through in the additions. Care should be taken not to change or alter the following: 1. Structure - Necessary structural improvements, :,here safety demands should be accomplished in such a way as to cause minimal visual change to the original style and construction. 2. Construction and Style - All work should be done in the architectural style and in a technique compatible with that of the original structure. Change that alters, removes, or covers existing significant stylistic detail shall not be permitted. A change which adds detail of another stvl e v.,iI1 riot be • permitted. 3. Materials - Additions and improvements involvin;; any new :-raterial in the landmark should be of the same material as the original. It should be the same size and texture. An alternative material may be allowed if it duplicates -the original. a. wood - all wood trim should conform with existing trir, in shape and size. b. siding materials - the Commission discourages the covering or alteration of original materials with additional siding. Structures already sided with incompatible materials should be returned to a sidine, similar to the original when renovation is considered. D. Demolition Historic landmarks shall not be demolished. When: a landmark poses a threat, to the public safety, and demolition is the only alternative, documentation by way of photographs, measured drawings, or other descriptive methods should be made of both the exterior and interior of the landmark. The person or agency responsible for demolition of the landmark shall be responsible for this documentation. E. Moving The moving of landmarks is discouraged, however, moving is preferred to demolition. When moving is necessary, the owner of the landmark must apply t -o the Commission • for a Certificate of Appropriateness. F. Signs No neon or flashing signs will be permitted unless they are original to the structure. i Bia llboards and supergraphics will also be disallowed. Only one