Title 8 — ZONING›Division 84 — LAND USE DISTRICTS
Chapter 84-44 — O-1 LIMITED OFFICE DISTRICT
Contra Costa County Municipal Code · 2026-09 edition · updated 2026-10-02 · Contra Costa County
84-44.202 - General provisions.¶
All land within an O-1 limited office district may be used for any of the following uses, under the following regulations set forth in this chapter.
(Ord. 1883: prior code § 8157.5 (part)).
Article 84-44.4. Uses
84-44.402 - Use—Permitted.¶
The following uses are permitted provided that no merchandise is stored, handled, displayed or sold on the premises:
(1)
Professional offices such as those pertaining to, but not limited to, the practice of law, architecture, dentistry, medicine, engineering and accounting;
(2)
Administrative, executive and editorial offices;
(3)
Business offices for insurance, real estate and investment brokers or representatives.
(Ords. 76-75 § 4 (part), 1883: prior code § 8157.5(a)).
84-44.404 - Use—Requiring land use permit.¶
In the O-1 district the following uses are permitted upon the issuance of a land use permit:
(1)
Hospitals, eleemosynary and philanthropic institutions, convalescent homes, and boarding homes.
(2)
Churches, religious institutions, and parochial and private schools.
(3)
Community buildings, clubs, and activities of a quasi-public, social, fraternal or recreational character, such as golf, tennis and swimming clubs; veterans' and fraternal organizations not organized for monetary profit.
(4)
Publicly owned buildings and structures, except as provided in Division 82.
(5)
Studios and galleries for arts and crafts, music and dance, and photography.
(6)
Commercial radio and television receiving and transmitting facilities; broadcasting studios or business offices; home cablevision facilities, including repair shops, storage areas, and equipment parking space necessary for operation and maintenance of the system.
(7)
Drug and prescription sales accessory to a medical office or clinic providing such use is definitely incidental to the primary use and is not visible from the street.
(8)
Animal hospital.
(9)
A child care center, as the term is defined in California Code of Regulations, title 22, section 101152(c)(7), that has obtained all required state and local agency approvals and licenses.
(Ords. 76-75 § 4 (part), 71-95 § 1, 71-55 § 1, 1883: prior code § 8157.5(b)).
(Ord. No. 2022-37, § X, 12-6-22)
Article 84-44.6. Lots
84-44.602 - Lot—Area.¶
No building or structure permitted in the O-1 district shall be erected or placed on a lot having less than fifteen thousand square feet.
(Ord. 1883: prior code § 8157.5(c)).
84-44.604 - Lot—Width.¶
No building or structure permitted in the O-1 district shall be erected or placed on a lot having less than one hundred feet in average width.
(Ord. 1883: prior code § 8157.5(d)).
84-44.606 - Lot—Depth.¶
No building or structure permitted in the O-1 district shall be erected or placed on a lot having less than ninety feet in depth.
(Ord. 1883: prior code § 8157.5(e)).
84-44.608 - Lot—Coverage.¶
No buildings or structures permitted in the O-1 district shall cover more than thirty-five percent of the lot area.
(Ord. 1883: prior code § 8157.5(l)).
Article 84-44.8. Building Height
84-44.802 - Building height—Maximum.¶
No building or structure permitted in the O-1 district shall exceed two and one-half stories or thirty-five feet in height.
(Ord. 1883: prior code § 8157.5(f)).
Article 84-44.10. Yards
84-44.1002 - Yard—Side.
There shall be an aggregate side yard width of at least fifteen feet with no single side yard being less than five feet in width, except that when a side yard abuts a residential land use district, it shall then have a minimum width of fifteen feet with a minimum of five-foot width on the other side.
(Ord. 1883: prior code § 8157.5(g)).
84-44.1004 - Yard—Setback.
There shall be a setback (front yard) of at least twenty feet for any building or structure in the O-1 district; on corner lots, the principal frontage of the lot shall have a setback of at least twenty feet and the other setback shall be at least fifteen feet.
(Ord. 1883: prior code § 8157.5(h)).
84-44.1006 - Yard—Rear.
Rear yard provisions for the O-1 district shall be the same as those for the R-6 district (84-4.1006).
(Ord. 1883: prior code § 8157.5(i)).
Article 84-44.12. Off-Street Parking
84-44.1202 - Off-street parking—Space requirements.
One automobile storage space shall be provided on the same lot or parcel for each two hundred square feet of floor area of building, except that for medical and dental offices, a minimum of five automobile storage spaces shall be provided on the same lot or parcel for each full-time doctor.
(Ord. 1883: prior code § 8157.5(j)).
Article 84-44.14. Building Size
84-44.1402 - Building size—Gross floor area.
No building in the O-1 district shall have a gross floor area exceeding fifteen thousand square feet.
(Ord. 1883: prior code § 8157.5(k)).
Article 84-44.16. Open Area
84-44.1602 - Open area—General provisions.
Twenty-five percent of the parcel shall not be occupied by buildings, structures, or pavement, but shall be landscaped. Seventy-five percent of this twenty-five (open area) shall be planted and maintained with growing plants.
(Ord. 1883: prior code § 8157.5(m)).
Article 84-44.18. Signs
84-44.1802 - Sign—Restrictions.
One sign per parcel having a maximum size of ten square feet shall be permitted. No sign shall rotate, flash, or animate. No sign shall exceed the height of the roof eave line or twenty feet, whichever is lowest. No sign shall face a residential land use district which may be abutting the subject parcel. No freestanding signs are to be permitted.
(Ords. 74-51, 1883; prior code § 8157.5(n)).
Article 84-44.20. Site Plan and Elevations
84-44.2002 - Site plan and elevation—Scale drawing.
All developments proposed on the O-1 district shall submit an application to gain approval of the site plan and elevations. The application shall include drawings drawn to scale indicating the same data required for the M-4 district (Section 84-30.2202) except for the deletion of "Amount of studio, one bedroom, two bedroom or other size apartment units." Reference to "zoning administrator" is changed to "board of adjustment" in final item.
(Ord. 1883: prior code § 8157.5(o)(1)).
84-44.2004 - Site plan and elevation—Review and approval of application.
The board of adjustment shall review the site plan and elevations applications in public hearing under Chapter 26-2. In approving the application, the board of adjustment shall find that the application is consistent with the intent of the O-1 district and that it is compatible with other uses in the vicinity, both within and without the district. When any plan has been approved by the board of adjustment, it shall not thereafter be altered or changed except with the approval of the board of adjustment after reviewing the proposed alterations or changes. For the review the board of adjustment may schedule a public hearing under Chapter 26-2.
(Ord. 1883: prior code § 8157.5(o)(2)).
84-44.2006 - Site plan and elevation—Imposition of conditions.
The board of adjustment may impose reasonable conditions and limitations in addition to the requirements listed in this chapter in order to further carry out and develop the intent and purpose of the O-1 district.
(Ord. 1883: prior code § 8157.5(o)(3)).
84-44.2008 - Site plan and elevation—Rezoning to O-1 district.
An applicant requesting a change in zoning to the O-1 limited office district shall follow the procedure set forth for the M-4 district (Section 84-30.2208).
(Ord. 1883: prior code § 8157.5(o)(4)).
Article 84-44.22. Land Use and Variance Permits
84-44.2202 - Land use and variance permit—Granting.
Land use permits for the special uses enumerated in Section 84-44.404 and variance permits contained in Sections 84-44.602 through 84-44.1802 may be granted in accordance with Chapter 82-6.
(Ord. 1883: prior code § 8157.5(p)).
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