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Treatment shall be defined as any change of surface materials that will not alter the style or original form. Such improvements include re- roofing, glazing, or landscaping lawns and may involve a change that can potentially enhance or detract from the character of he landmark. A treatment change of any surface whether on the landmark or in its environment may require a Certificate of Appropriateness if it significantly alters the appearance of the landmark. Although these kinds of changes may not require a Building Permit, a Certificate of Appropriateness may be necessary. The commission should review the proposed treatment for character and style consistency with the original surfaces. C. Renovation and Additions Renovation is the modification of a structure, which does not alter the general massing while and 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 form and unity of ht landmark and should not cover singular examples of architectural detail. Additions to landmarks should be added in a manner that does not disrupt the visible unity of 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, where safety demands should be accomplished in such a way as to cause minimal visual change to the original style and construction. 2. Material— Additions and improvements involving any new material 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 trim in shape and size. STAFF RECOMMENDATION: The windows in the converted school house are not original to the structure. The windows on the first floor have been replaced at least once and the windows on the second floor were added when the school was converted to a dwelling. Staff recommends approval of the vinyl replacement windows on the second floor and in the rear on the first floor. The first floor windows with the transoms are problematic because of the floor joist is in the transom section of the windows which blocks the removal of the transom without destroying the transoms. The transom sections of these windows are very poorly insulated. The use of the white raised panel is an appropriate solution to this problem as it will cover the insulation and sheathing and achieve the look of what is there now. The white trim will match the rest of the trim on the house when the Swanks re -paint the house. Staff is withholding recommending the approval of the vinyl replacement windows in the windows with the transoms until the Schoberg estimate is evaluated.