Extension on the back of the house by 16' to the North.
The width will be 21' which leaves a 1-foot offset on either side of the house to delineate the addition.
The back portion of the roof and over the addition will be changed to a gable style. (The existing shed style roof does not have the proper slope to meet code requirements and pools water on it at the back. This would allow for the proper slope and better drainage of water.)
Walls within 5' will require this 1hr rated wall and allows openings, walls with 3' are not allowed to have any openings. The fire walls are not visually different, except for the ones not allowing openings. (Due to the proximity of walls to the property lines the building department will require the construction of 1hr rated fire walls.)

FORT SANDERS NEIGHBORHOOD CONSERVATION DISTRICT GUIDELINES
1. Addition should be made to the rear or side of the building.
2. The wall of the new structure (addition) should not be continuous with the wall of the existing building, but have a minimum 4' x 6' indentation.
3. Widows or French doors and balconies shall provide 10% to 20% transparency on the sides of buildings.
SECRETARY OF INTERIORS STANDARDS
1. 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.
2. The historic character of a property shall be retained and preserved.
3. New additions, exterior alterations, or related new construction shall not destroy historic materials that characterize the property. The new work shall be differentiated from the old and shall with compatible with the massing, size, scale, and architectural features to protect the historic integrity of the property and its environment.
4. 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.