The Developing Hillside Treatment Area is a special asset to the community. Traditionally, it has been perceived as open space, and established trails in the area have been used frequently to provide access to recreational attractions above the town. Undeveloped land here is in a relatively natural state, which contrasts strongly with the historic district below. This creates a distinct boundary between the established infrastructure and the surrounding mountains. Any projects in this area will diminish this characteristic and thus, to the greatest extent possible, a project should blend in with the hillsides to preserve the natural image.

Because this part of town is so distinctive, the standards for the Developing Hillside Treatment Area focus more on respecting the natural environment and minimizing visual impacts of development than on relating to the established architectural vocabulary of the historic district.

Also, this treatment area poses special technical problems including rockfall, soil erosion and drainage control. Any project in this area should incorporate designs that mitigate these conditions and also provide for basic service and safety needs. Because of these concerns, any hillside development should undergo strict environmental and engineering review.

The Geologic Hazard Control Section (Article 8, Division 5) shall apply to all projects in the Developing Hillside Treatment Area. For development in this area, also refer to the Hillside Master Plan and zone district standards.