Contemporary additions to historic buildings require special care and sensitivity in design. The addition should respect the existing building's design and materials while at the same time remaining distinct from the original structure. Depending on the scale and size of the new addition, it should have its own design integrity that is separate from the historic resource.

If a function cannot be placed in an interior space and a new addition is necessary, the addition should be constructed to the rear or an inconspicuous side of the historic resource. The addition should be limited in size, scale and relationship to the historic building.

The new addition should be designed in such a manner that there is the least possible loss of historic materials. Character-defining features should not be damaged, obscured or destroyed.

The new addition should be clearly differentiated from the historic structure. In other words, the new addition should clearly distinguish between the old and the new. This can be accomplished by offsetting the new addition from the original structure; a subtle change in materials or the insertion of a vertical joint or trim element.

Additions to historic buildings should incorporate roofing materials and details that are compatible, in terms of color, texture and material, to those of the original structure. The roof of a new addition should not obscure the basic roof form of the original building.

Fences and walls
Walls and fences help define and screen parking lots, yards and walkways. They can become important landscape features of the Historic District. A variety of fence styles and types were found historically in the District.

• Because they are not appropriate to many of the District's neighborhoods, chain-link fences will seldom be approved. Metal fences may be appropriate in some locations. For this reason, they will be approved on a case-by-case basis. Stockade and split-rail fences are not appropriate to the urban environment and will not be approved.
• All wood fences shall be painted or stained with an opaque stain within six months after their installation.
• Although the Zoning Ordinance allows for a 6' fence (including posts and retaining walls), the Commission might not approve a fence at that height. The Commission encourages lower fences in backyards to preserves sight lines.
• Concrete block walls and other similar masonry materials may be approved on a case-by-case basis.