Special design review areas are established to preserve the existing natural quality of the area and to provide for the adaptation of man-made development to the natural scenery and specific site conditions; to protect and enhance the visual character along designated major circulation corridors within the community; to protect public and private property from excessive storm water runoff, soil erosion, earth movement, and fire hazard; all in accordance with the general plan.

(Ord. 1979-166 § 19 (part), 1979: Ord. 1967-80 § 1 (6403.1), 1967)

The provisions of this chapter shall apply to the areas set forth on the zoning map, adopted by Section 18.08.010.

(Ord. 1979-166 § 19 (part), 1979: Ord. 1967-80 § 1 (6403.2), 1967)

All applications for building permits for structures shall be subject to architectural and site control commission approval as provided in Chapter 18.64, with particular attention given to form, size, materials and color of buildings, structures, and planting to ensure maximum compatibility of such improvements with the natural setting and established character of Portola Valley as well as the purposes in Section 18.30.010. All trees to be planted in this combining district shall be from a list approved by the conservation committee. The architectural and site control commission may adopt rules for the administration of this section, including but not limited to, waiver provisions.

(Ord. 1979-166 § 19 (part), 1979: Ord. 1967-80 § 1 (6403.3 (A)), 1967)

The following uses and activities are prohibited in all locations within one hundred feet of the right-of-way of Skyline Boulevard unless specifically authorized by the architectural and site control commission as part of a building or site development project:

A.

Removal of vegetation, other than poison oak, from more than five percent of the area of any parcel or portion of any parcel within the D-R district;

B.

Removal of living trees with a trunk having a circumference of over twelve inches measured four feet above the surface of the ground;

C.

Excavation or filling or any combination thereof totalling in excess of twenty-five cubic yards on any parcel;

D.

Disturbance of the surface of the ground exceeding five percent of the area of any parcel.

(Ord. 1979-166 § 19 (part), 1979: Ord. 1967-80 § 1 (6403.3 (B)), 1967)

To protect Skyline Boulevard as a scenic highway, points to access to the road shall be limited to the maximum extent feasible.

(Ord. 1979-166 § 19 (part), 1979: Ord. 1967-80 § 1 (6403.3 (C)), 1967)

Where a parcel, which is ten acres or larger, is to be subdivided into three or more parcels in a single year, or is to be subdivided into two parcels either one of which is capable of future resubdivision, such subdivision shall be applied for and processed as a planned unit development pursuant to this title in addition to being applied for and processed as a subdivision pursuant to the subdivision ordinance. It is recognized that most undeveloped parcels in the D-R combining district have significant characteristics such as steep slopes, unstable land, limited access, and vegetation important for ecologic and aesthetic purposes, and that flexibility in normal standards afforded by the planned unit development procedure will help achieve subdivisions carefully adjusted to specific site conditions and consistent with the town general plan. In addition, this requirement provides for design review and for imposing specific requirements on developments to help ensure that design objectives are implemented.

(Ord. 1979-166 § 19 (part), 1979: Ord. 1967-80 § 1 (6403.3 (C)), 1967)