Suburban residence districts, hereinafter designated as R-S districts, are established to regulate and control the development in appropriate areas of relatively large building sites at various densities in harmony with the character of existing or proposed development in the neighborhood, and to assure the provision of light, air and privacy, and the maintenance of usable open space in amounts appropriate to the specific types and numbers of dwellings permitted. Adherence to a specified site development review plan is required for the disposition of buildings, the relationship between living areas and those needed for vehicular access, circulation and parking in order to assure the optimum utilization of the building site.

(Prior gen. code § 8-28.0)

Residential development within the R-S districts located within the planning areas of San Lorenzo, Ashland, Cherryland, Fairview, or Castro Valley (areas within the Castro Valley Urbanized Area) shall be subject to the "Residential Design Standards and Guidelines for the Unincorporated Communities of West Alameda County," as amended. On matters not provided for in the Residential Design Standards and Guidelines for the Unincorporated Communities of West Alameda County, the respective regulations in this zoning ordinance shall apply.

(Ord. No. 2014-39, § 3, 10-7-14, eff. 1-1-15)

Whenever the area of a building site in an R-S district equals or exceeds five times the area required for one dwelling unit, every dwelling or accessory structure hereafter placed upon such building site or any mobilehome to be permanently located on a foundation system shall be subject to site development review, pursuant to Section 17.54.210.

(Prior gen. code § 8-28.1)

(Ord. No. 2010-71, § 14, 12-21-10)

The following principal uses are permitted in any R-S district:

A.

One-family dwelling, two-family dwelling, multiple dwelling or dwelling group;

B.

Field crop, orchard, garden;

C.

Medical or residential care facility for up to six persons per unit; and

D.

Licensed transitional or supportive housing for up to six persons per unit.

(Prior gen. code § 8-28.2)

(Ord. No. 2010-71, § 15, 12-21-10; Ord. No. 2012-58, § 12, 4-10-12)

The following are conditional uses and shall be permitted in an R-S district only if approved by the planning commission, sitting as a board of zoning adjustments, as provided in Sections 17.54.135 and 17.12.010:

A.

Hospitals in districts requiring not more than fifteen hundred (1,500) square feet of building area per dwelling unit.

(Ord. 2000-53 § 1 (part))

(Ord. No. 2010-71, § 16, 12-21-10)

In addition to the uses listed in Sections 17.52.480 and 17.52.580, the following are conditional uses in R-S districts, and shall be permitted only if approved by the board of zoning adjustments as provided in Section 17.54.130:

A.

Community facility;

B.

Community clubhouse;

C.

Parking lot, as regulated in Section 17.08.040C;

D.

Plant nursery or greenhouse used only for the cultivation of plant materials;

E.

Medical or residential care facility for seven or more persons per unit as regulated in Section 17.54.133 (Conditional uses—Residential, medical care, transitional and supportive housing facilities);

F.

Mobilehome parks, as regulated by Sections 17.52.1000 to 17.52.1065, of this title;

G.

Licensed transitional and supportive housing for seven or more persons per unit as regulated in Section 17.54.133 (Conditional uses—Residential, medical care, transitional and supportive housing facilities); and

H.

Unattended collection box(es) placed in conjunction with an approved community facility as defined in Section 17.04.010.

(Ord. 2002-60 § 1 (part); Ord. 2000-53 § 1 (part); prior gen. code § 8-28.3)

(Ord. No. 2010-71, § 17, 12-21-10; Ord. No. 2012-58, § 13, 4-10-12; Ord. No. 2013-26, § 5, 7-16-13)

Except as otherwise provided in the case of a combining district, the number of dwelling units permitted on a building site in an R-S district shall not exceed the number obtained by dividing the area in square feet of the building site by five thousand (5,000), disregarding any fraction.

(Prior gen. code § 8-28.4)

Except as otherwise specified in the case of a combining district, and except for mobilehome parks as regulated by Chapter 17.52, Sections 1000—1060, of this title, every use in an R-S district shall be on a building site having a median lot width not less than fifty (50) feet, and an area not less than five thousand (5,000) square feet. A corner building site shall have a median lot width of not less than sixty (60) feet.

(Prior gen. code § 8-28.5)

(Ord. No. 2010-71, § 18, 12-21-10)

Except as otherwise provided in Sections 17.12.080 and 17.12.090, the yard requirements in R-S districts shall be as follows, subject to the general provisions of Section 17.52.330:

A.

Depth of front yard: Not less than twenty (20) feet;

B.

Depth of rear yard: Not less than twenty (20) feet;

C.

Width of side yard: Not less than ten feet.

(Prior gen. code § 8-28.6)

A distance of not less than twenty (20) feet shall be provided between all main buildings, which space shall be open from its ground to the sky except for the architectural features authorized by Section 17.52.370.

(Prior gen. code § 8-28.7)

When the number of dwelling units permitted on a building site does not exceed two, the side yard requirements shall be the same as those set forth for R-1 districts.

(Prior gen. code § 8-28.8)

No dwelling shall have a height of more than two stories, except as provided by Section 17.52.090; nor shall any building or structure have a height in excess of twenty-five (25) feet, except as provided by Section 17.52.090.

(Prior gen. code § 8-28.9)

No main building shall be less than twenty (20) feet from any other main building.

Where an accessory building or a space designed or used for the parking of a motor vehicle occupies any part of the area between the two dwellings on the same building site, such occupied space shall not be included in the calculation of the required minimum distance between them. No parking space shall in any event be situated less than four feet from the wall of any dwelling, except when within the dwelling or within an attached carport or garage.

(Prior gen. code § 8-28.10)

(Ord. No. 2010-71, § 19, 12-21-10)

The following regulations shall also apply in R-S districts:

A.

The width of access driveways shall be not less than that required by Section 17.52.790; provided however, that the planning commission may require a driveway of greater width or provision for a street where found necessary to assure adequate circulation in the vicinity;

B.

The minimum setback from the access driveway shall be as required by Section 17.52.800;

C.

There shall be effective structural or landscape screening of private and utility areas, and a system of walkways, independent of the driveways to give safe pedestrian access from the street to every dwelling unit and to all commonly utilized open spaces;

D.

The area of useable open space provided on the site, calculated pursuant to Section 17.52.390, shall be not less than six hundred (600) square feet for each dwelling unit thereon.

(Prior gen. code § 8-28.11)

(Ord. No. 2010-71, § 20, 12-21-10)