The provisions of this chapter shall be known as the R-20 low density residential zone regulations. The R-20 zone is intended to create, preserve, and enhance areas for single-family dwellings at low densities in spacious environments, and is typically appropriate to portions of the Oakland hill area. These regulations shall apply in the R-20 zone. (Prior planning code § 3350)

Except for projects that are exempt from design review as set forth in Section 17.136.025, no Local Register Property, Residential Facility, Mixed Use Development, Telecommunications Facility, Sign, or other associated structure shall be constructed, established, or altered in exterior appearance, unless plans for the proposal have been approved pursuant to the design review procedure in Chapter 17.136, and when applicable, the Telecommunications regulations in Chapter 17.128, or the Sign regulations in Chapter 17.104. (Ord. 12776 § 3, Exh. A (part), 2006: Ord. 11904 § 5.60 (part), 1996: prior planning code § 3352)

The following activities, as described in the use classifications in Chapter 17.10, are permitted:
A. Residential Activities:

Permanent

Residential Care occupying a One-Family Dwelling Residential Facility
B. Civic Activities:

Essential Service

Limited Child-Care

Telecommunications
(Ord. 12138 § 5 (part), 1999; Ord. 11904 § 5.07 (part), 1996; prior planning code § 3353)

The following activities, as described in the use classifications in Chapter 17.10, may be permitted upon the granting of a conditional use permit pursuant to the conditional use permit procedure in Chapter 17.134:
A. Civic Activities:

Community Assembly

Community Education

Nonassembly Cultural

Administrative

Utility and Vehicular

Extensive Impact
B. Agricultural and Extractive Activities:

Plant Nursery

Crop and Animal Raising

Mining and Quarrying
C. Off-street parking serving activities other than those listed above or in Section 17.14.040, subject to the conditions set forth in Section 17.102.100.
D. Additional activities which are permitted or conditionally permitted in an adjacent zone, on lots near the boundary thereof, subject to the conditions set forth in Section 17.102.110. (Ord. 12138 § 5 (part), 1999; prior planning code § 3354)

The following facilities, as described in the use classifications in Chapter 17.10, are permitted:
A. Residential Facilities:

One-Family Dwelling

One-Family Dwelling with Secondary Unit, subject to the provisions specified in Section 17.102.360
B. Nonresidential Facilities:

Enclosed

Open
C. Signs:

Residential

Special

Development

Realty

Civic
D. Telecommunications Facilities:

Micro, except as provided in Chapter 17.128

Mini, except as provided in Chapter 17.128
(Ord. 12501 § 14, 2003: Ord. 11904 § 5.09 (part), 1996; prior planning code § 3355)

The following facilities, as described in the use classifications in Chapter 17.10, may be permitted upon the granting of a conditional use permit pursuant to the conditional use permit procedure in Chapter 17.134:
A. Signs:

Business
B. Telecommunications Facilities:

Micro, except as provided in Chapter 17.128 and Section 17.134.020(A) (23)

Mini, except as provided in Chapter 17.128 and Section 17.134.020(A) (23)

Macro

Monopole
(Ord. 12501 § 15, 2003: Ord. 12199 § 4B, 2000; Ord. 11904 § 5.10 (part), 1996; prior planning code § 3356)

All Signs shall be subject to the applicable limitations set forth in Section 17.104.010. (Prior planning code § 3363)

Every lot shall have a minimum lot area of twelve thousand (12,000) square feet and a minimum lot width of ninety (90) feet, except as a lesser area or width is allowed by Section 17.106.010 and except as provided hereafter in this section. Whenever land is divided in such a way that the real estate subdivision regulations apply, the minimum average lot area of all lots intended for improvement within the subdivision shall be twelve thousand (12,000) square feet; the minimum average lot width of all such lots shall be ninety (90) feet; the minimum lot area of any individual lot within the subdivision shall be ten thousand (10,000) square feet; and the minimum lot width of any individual lot within the subdivision shall be seventy-five (75) feet. Every lot shall have a minimum frontage of twenty-five (25) feet upon a street, except as this requirement is modified by Section 17.106.020. (Prior planning code § 3364)

The maximum density of Residential Facilities shall be as set forth below. Also applicable are the provisions of Section 17.102.270 with respect to additional kitchens for a dwelling unit, and the provisions of Section 17.102.300 with respect to dwelling units with five or more bedrooms. No residential facility shall be permitted to have both an additional kitchen as provided for in Section 17.102.270B and a Secondary Unit.
A. Permitted Density. One primary dwelling unit is permitted on each lot. A Secondary Unit may also be permitted, thereby making a total of two dwelling units on the lot, subject to the provisions of Section 17.102.360. (Ord. 12776 § 3, Exh. A (part), 2006: Ord. 12501 § 16, 2003: Ord. 12199 § 5A (part), 2000; Ord. 12116 § 2 (part), 1999; prior planning code § 3365)

A. General. Except as otherwise provided in Section 17.108.020, where the site area to be covered by the structure exceeds a gradient of twenty (20) percent, Section 17.108.030, and Chapter 17.128, the maximum height of buildings and other facilities shall be twenty-five (25) feet, except that the highest portion of a pitched roof on a principal building or other principal facility may extend up to thirty (30) feet if all portions of the roof above twenty-five (25) feet are:
1. Pitched at a vertical to horizontal ratio of no less than one to three (1:3) and no more than two to one (2:1); and
2. If located within ten feet of an interior side lot line, pitched upward from such lot line for a distance of at least ten feet from the lot line (see illustration I-4a).
An exception is that if at least sixty (60) percent of the buildings in the immediate context are no more than one story in height, the maximum wall height shall be fifteen (15) feet within the front twelve (12) feet of buildable area. The immediate context shall consist of the five closest lots on each side of the project site plus the ten closest lots on the opposite side of the street (see illustration I-4b); however, the Director of City Planning may make an alternative determination of immediate context based on specific site conditions. Such determination shall be in writing and included as part of any approval of any variance, conditional use permit, design review, determination of exemption from design review, or other special zoning approval or, if no special zoning approval is required, part of any City Planning signoff of a building permit application.
B. Accessory Structures. Except as otherwise provided in Section 17.108.030 or Section 17.108.130, no accessory structure shall exceed fifteen (15) feet in height.
C. Other Provisions. See Section 17.12.080 for maximum height of Signs, and Section 17.108.130 for maximum height of facilities within minimum yards. (Ord. 12376 § 3 (part), 2001: prior planning code § 11904 § 5.13, 1996: prior planning code § 3369)

The following minimum yards shall be provided unobstructed except for the accessory structures or the other facilities allowed therein by Section 17.108.130. See also Section 17.108.020 for greater yard requirements applying to certain facilities which exceed the general maximum height prescribed in Section 17.14.110.
A. Front Yard. The minimum front yard depth on every lot shall be twenty (20) feet, except as a lesser depth is allowed by Section 17.108.050 on steep slopes.
B. Side Yard--Street Side of Corner Lot. The minimum side yard width on the street side of every corner lot shall be as prescribed in Section 17.108.060.
C. Side Yard--Interior Lot Line. The minimum side yard width along each interior side lot line of every lot shall be the greater of:
1. Six feet; or
2. Fifteen (15) percent of the lot width at any point between the front and back of any structure on the lot (see illustration 1-4c).
D. Rear Yard. The minimum rear yard depth on every lot shall be twenty-five (25) feet, except as a lesser depth is allowed by Section 17.108.110. For lots which abut an adjoining rear yard, the minimum rear yard depth shall be increased by an additional one-half (0.5) foot of rear yard depth for each additional one foot of lot depth over one hundred (100) feet, up to a maximum rear yard depth of eighty (80) feet. (Ord. 12376 § 3 (part), 2001: prior planning code § 3370)

Except where the site area to be covered by the principal building or other principal facility exceeds a gradient of twenty (20) percent, the lot coverage for lots containing only Residential Facilities with up to two dwelling units shall not exceed twenty-five (25) percent or two thousand (2,000) square feet, whichever is greater. (Ord. 12376 § 3 (part), 2001)

Where the site area to be covered by the principal building or other principal facility exceeds a gradient of twenty (20) percent, the building length facing a side lot line shall be limited to thirty-five (35) feet if within the greater of:
A. Ten feet of the side lot line; or
B. The distance from the side lot line equal to twenty (20) percent of the lot width.
(See illustration I-4d). (Ord. 12376 § 3 (part), 2001)

All uses shall be subject to the applicable requirements of the buffering regulations in Chapter 17.110 with respect to screening or location of parking, loading, and storage areas; control of artificial illumination; and other matters specified therein. (Ord. 12376 § 3 (part), 2001: prior planning code § 3372)

Large, integrated developments shall be subject to the planned unit development regulations in Chapter 17.122 if they exceed the sizes specified therein. In developments which are approved pursuant to said regulations, in the R-20 zone certain of the other regulations applying in said zone may be waived or modified. (Ord. 12376 § 3 (part), 2001: prior planning code § 3373)

A. Parking and Loading. Off-street parking and loading shall be provided as prescribed in the off-street parking and loading requirements in Chapter 17.116.
B. Home Occupations. Home occupations shall be subject to the applicable provisions of the home occupation regulations in Chapter 17.112.
C. Nonconforming Uses. Nonconforming uses and changes therein shall be subject to the nonconforming use regulations in Chapter 17.114.
D. General Provisions. The general exceptions and other regulations set forth in Chapters 17.102, 17.104, 17.106, and 17.108 shall apply in the R-20 zone.
E. Recycling Space Allocation Requirements. The regulations set forth in Chapter 17.118 shall apply in R-20 zone.
F. Landscaping and Screening Standards. The regulations set forth in Chapter 17.124 shall apply in the R-20 zone. (Ord. 12376 § 3 (part), 2001: amended during 1997 codification; Ord. 11807 § 3 (part), 1996; prior planning code § 3374)