Four-family districts, hereinafter designated as R-3 districts, are established to provide for and protect the development of a limited type of multiple dwelling in areas found to be suitable for such use.

(Prior gen. code § 8-29.0)

Residential development within the R-3 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, § 5, 10-7-14, eff. 1-1-15)

The following principal uses are permitted in an R-3 district:

A.

One-family dwelling, two-family dwelling, multiple dwelling, or dwelling group, up to a total not to exceed four dwelling units;

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; and

E.

In Castro Valley (areas within the Castro Valley Urbanized Area), Small family day cares and large family day cares.

(Prior gen. code § 8-29.1)

(Ord. No. 2012-58, § 14, 4-10-12; Ord. No. 2020-66, § 5, 12-15-20)

The following are conditional uses and shall be permitted in an R-3 district only if approved by the planning commission, sitting as a board of zoning adjustments, as provided in Sections 17.54.135 and 17.14.010:

A.

Hospital.

(Ord. 2000-53 § 1 (part))

(Ord. No. 2010-71, § 21, 12-21-10)

In addition to the uses listed for Sections 17.52.480 and 17.52.580, the following are conditional uses in R-3 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.

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

D.

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

E.

Parking lot, as regulated in Section 17.08.040(C);

F.

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);

G.

Mobilehome parks subject to the provisions provided in Sections 17.52.1000 to 17.52.1065;

H.

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

I.

In Castro Valley (areas within the Castro Valley Urbanized Area), Day care centers.

(Ord. 2002-60 § 1 (part); Ord. 2000-53 § 1 (part); prior gen. code § 8-29.2)

(Ord. No. 2012-58, § 15, 4-10-12; Ord. No. 2013-26, § 6, 7-16-13; Ord. No. 2020-66, § 6, 12-15-20)

The number of dwelling units on a lot or building site in an R-3 district shall not exceed one for each full two thousand (2,000) square feet of the area thereof, or be in any case more than four.

Exception—In Castro Valley (areas within the Castro Valley Urbanized Area), the four unit per lot maximum does not apply. The maximum units on a lot in Castro Valley is limited to one for each full two thousand (2,000) square feet.

(Prior gen. code § 8-29.3)

(Ord. No. 2020-66, § 7, 12-15-20)

Except as otherwise specified in the case of a combining district, every use in an R-3 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 § 8-29.4)

Except as otherwise required in the case of a combining district, the minimum requirements for yards in an R-3 district 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 five feet plus one foot for each full ten feet by which the median lot width exceeds fifty (50) feet up to a maximum requirement of ten feet, but in no case less than six feet for an interior side yard or less than ten feet on the street side of a corner lot, or less than required by Section 17.14.080.

(Prior gen. code § 8-29.5)

(Ord. No. 2010-71, § 22, 12-21-10)

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 § 8-29.6)

The following regulations shall also apply in R-3 districts:

A.

At least one side yard shall have a width not less than fifteen (15) feet in the case of a four-family dwelling and no multiple dwelling shall be so oriented upon a lot as to have its main or living room entrance opening into a side yard less than twenty (20) feet wide;

B.

No dwelling shall be located to the rear of another dwelling on the same building site unless one side yard is at least fifteen (15) feet wide, except in the case of a dwelling group arranged around three sides, or on two opposite sides of an open unoccupied space other than a side yard, having a width not less than twenty-five (25) feet and extending to the front lot line;

C.

No dwelling shall be located less than twenty (20) feet from any other dwelling on the lot, and none of such minimum required space shall be used as parking space;

D.

The minimum width of access driveway shall be as required by Section 17.52.790;

E.

The minimum setback from access driveway shall be as required by Section 17.52.800. (See also Section 17.52.470)

(Prior gen. code § 8-29.8)

(Ord. No. 2010-71, § 23, 12-21-10)