Title 8 — ZONING & DEVELOPMENT CODE
Chapter 8.48 — COSC, COMMUNITY OPEN SPACE CONSERVATION DISTRICT
San Mateo County Zoning Code · 2026-06 edition · updated 2026-07-25 · San Mateo County
8.48.010 Regulations For “COSC” District. ¶
The following regulations shall apply in all “COSC” Districts and shall be subject to all applicable provisions of Article 2 (Development Procedures) and Article 3 (General Development Standards) of Title 8.
(Prior Code § 6225, 6226, 6227, 6228; Ord 2701 – 12/16/80)
8.48.020 Purpose. ¶
The purpose of the “COSC” District is to protect areas designated for general open space in adopted Community Plans by providing for planned low intensity development which preserves, to the greatest degree possible, the visual and open characteristics of the land.
(Prior Code § 6225, 6226, 6227, 6228; Ord 2701 – 12/16/80)
8.48.030 Uses Permitted. ¶
- (a) The following uses shall be permitted in the Community Open Space Conservation District:
Agricultural Uses and Accessory Structures: On-Site Sales of Agricultural Products, including but not limited to the following:
a. Flowering crops
b. Vegetable crops
c. Truck gardening
d. Community gardens
e. Christmas tree farms
Public Recreation Facilities, including but not limited to the following uses:
a. Parks
b. Playfields
c. Tot lots
(b) The following uses shall be permitted in the Community Open Space Conservation District subject to the securing of a use permit in each case:
Nurseries
Livestock and grazing
Commercial Recreation Facilities, including but not limited to the following uses:
a. Keeping of confined animals
b. Golf courses
c. Driving ranges
d. Campgrounds (non-vehicular)
e. Swimming pools
f. Athletic or sports clubs and facilities
Institutional Facilities, including but not limited to the following:
a. Community centers
b. Interpretive centers
- One single-family residence per parcel less than 40 acres in size, including accessory buildings and uses. Animal fanciers are also allowed in association with a single-family residence, subject to an animal fanciers’ permit. The
Director of Planning and Building may, on a case-by-case basis, exempt accessory buildings and uses and animal fanciers from the use permit requirement.
- Division of land, except that no residential uses shall be permitted on a parcel recorded after December 1, 1981.
(Prior Code § 6225, 6226, 6227, 6228; Ord 2701 – 12/16/80)
8.48.040 Development Standards. ¶
(a) Minimum building site: 2 acres
(b) Maximum height permitted: One-story not to exceed 16 feet in height
(c) Maximum lot coverage permitted: 10%
(d) Minimum yards required:
Front and rear: 50 feet
Sides: 20 feet each side
(e) Signs: Exterior advertising shall be prohibited. One non-illuminated identification sign not to exceed 20 square feet on each face shall be permitted.
(f) Design Review: All structures in this district shall be subject to architectural and site review by the Planning Commission as a portion of the use permit process to ensure that the architectural and site design is compatible with its environmental setting. Design guidelines set forth in the Community Design Manual and the Local Coastal Program (for areas in the Coastal Zone) shall be employed by the Planning Commission in the design review process.
(Prior Code § 6225, 6226, 6227, 6228; Ord 2701 – 12/16/80)
(Prior Code § 6227(b); Ord 2774 – 04/06/82)
(Prior Code § 6227(b); Ord 3432 – 11/10/92)
(Prior Code § 6227(b)(3)(a); Ord 4075 – 03/20/02)
(Prior Code § 6227(b)(4)(b); Ord 4844 – 05/04/21)
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▸ Title 8 — ZONING & DEVELOPMENT CODE
Overview- Article 1 — ZONING DISTRICTS, OVERLAY, AND COMBINING DISTRICTS
- Chapter 8.04 — ZONING GENERAL PROVISIONS
- Chapter 8.08 — DISTRICTS
- Chapter 8.12 — RE, RESIDENTIAL ESTATES
- Chapter 8.16 — R1, ONE-FAMILY RESIDENTIAL DISTRICTS
- Chapter 8.20 — R1-CCP, COUNTRY CLUB PARK
- Chapter 8.24 — R2, TWO-FAMILY RESIDENTIAL DISTRICT
- Chapter 8.28 — R3, MULTIPLE-FAMILY RESIDENTIAL DISTRICT
- Chapter 8.32 — R3-A, AFFORDABLE HOUSING DISTRICT
- Chapter 8.34 — PUD, PLANNED UNIT DEVELOPMENT DISTRICT
- Chapter 8.36 — A1, AGRICULTURAL DISTRICT
- Chapter 8.40 — A2, EXCLUSIVE AGRICULTURE DISTRICTS
- Chapter 8.44 — A3, FLORICULTURAL DISTRICTS
- Chapter 8.48 — COSC, COMMUNITY OPEN SPACE CONSERVATION DISTRICT
- Chapter 8.52 — EG, EL GRANADA GATEWAY DISTRICT
- Chapter 8.56 — P, PARKING DISTRICT
- Chapter 8.60 — H1, LIMITED HIGHWAY FRONTAGE DISTRICT
- Chapter 8.64 — O, OFFICE DISTRICTS
- Chapter 8.68 — C1, NEIGHBORHOOD BUSINESS DISTRICTS
- Chapter 8.70 — C1/NFO DISTRICT, NEIGHBORHOOD BUSINESS DISTRICT…
- Chapter 8.72 — C1/WMP District (NEIGHBORHOOD COMMERCIAL/WEST M…
- Chapter 8.76 — C2, GENERAL COMMERCIAL DISTRICTS
- Chapter 8.78 — C2, GENERAL COMMERCIAL DISTRICTS NORTH FAIR OAKS
- Chapter 8.82 — CCR, (COASTSIDE COMMERCIAL RECREATION DISTRICT)
- Chapter 8.86 — M1 (LIGHT INDUSTRIAL DISTRICTS)
- Chapter 8.88 — M1/NFO DISTRICT (MIXED-USE INDUSTRIAL/NORTH FAI…
- Chapter 8.90 — M1/EDISON/NFO” DISTRICT (MIXED-USE INDUSTRIAL/E…
- Chapter 8.94 — M2, HEAVY INDUSTRIAL DISTRICTS
- Chapter 8.98 — W, WATERFRONT DISTRICT
- Chapter 8.102 — I/NFO, INSTITUTIONAL/NORTH FAIR OAKS DISTRICT
- Chapter 8.106 — PAD DISTRICT, PLANNED AGRICULTURAL DISTRICT
- Chapter 8.110 — RH, RESIDENTIAL HILLSIDE DISTRICT
- Chapter 8.114 — PC DISTRICT (PLANNED COLMA DISTRICT)
- Chapter 8.118 — CMU-1 DISTRICT (COMMERCIAL MIXED USE-1 DISTRIC…
- Chapter 8.122 — CMU-2 DISTRICT (COMMERCIAL MIXED USE-2 DISTRIC…
- Chapter 8.126 — CMU-3 DISTRICT (COMMERCIAL MIXED USE-3 DISTRIC…
- Chapter 8.130 — NMU DISTRICT (NEIGHBORHOOD MIXED-USE DISTRICT,…
- Chapter 8.132 — NMU-ECR DISTRICT (NEIGHBORHOOD MIXED USE DISTR…
- Chapter 8.134 — RM DISTRICT (RESOURCE MANAGEMENT DISTRICT)
- Chapter 8.138 — RM-CZ DISTRICT (RESOURCE MANAGEMENT DISTRICT- …
- Chapter 8.142 — TPZ, TIMBERLAND PRESERVE ZONE
- Chapter 8.146 — TPZ-CZ, TIMBERLAND PRESERVE ZONE, COASTAL ZONE
- Chapter 8.150 — “S” DISTRICTS 1 to 13 (COMBINING DISTRICTS 1-13)
- Chapter 8.154 — S17 DISTRICT (COMBINING DISTRICT, MIDCOAST)
- Chapter 8.158 — S50 DISTRICT (COMBINING DISTRICT, NORTH FAIR O…
- Chapter 8.162 — S71 DISTRICT (COMBINING DISTRICT, DEVONSHIRE)
- Chapter 8.166 — S72 DISTRICT (COMBINING DISTRICT, WEST MENLO P…
- Chapter 8.170 — S73 DISTRICT (COMBINING DISTRICT, NORTH FAIR O…
- Chapter 8.174 — S74 DISTRICT (COMBINING DISTRICT, SELBY NEIGHB…
- Chapter 8.178 — S75 DISTRICT (COMBINING DISTRICT, WEEKEND ACRES)
- Chapter 8.182 — S81 DISTRICT (COMBINING DISTRICT, SAN MATEO HI…
- Chapter 8.186 — S82 DISTRICT (COMBINING DISTRICT, WEST MENLO P…
- Chapter 8.190 — S83 DISTRICT (COMBINING DISTRICT, LOS TRANCOS …
- Chapter 8.194 — S90 DISTRICT (COMBINING DISTRICT, MENLO OAKS)
- Chapter 8.198 — S91 DISTRICT (COMBINING DISTRICT, PALOMAR PARK)
- Chapter 8.202 — S92 DISTRICT (COMBINING DISTRICT, WEST MENLO P…
- Chapter 8.204 — S93 DISTRICT (COMBINING DISTRICT, NORTH FAIR O…
- Chapter 8.212 — S95 DISTRICT (COMBINING DISTRICT, LADERA)
- Chapter 8.216 — S100 DISTRICT (COMBINING DISTRICT, MENLO OAKS)
- Chapter 8.220 — S101 DISTRICT (COMBINING DISTRICT, PALOMAR PARK)
- Chapter 8.224 — S102 DISTRICT (COMBINING DISTRICT, DEVONSHIRE)
- Chapter 8.228 — S104 DISTRICT (COMBINING DIESTRICT, LADERA)
- Chapter 8.232 — S105 DISTRICT (COMBINING DISTRICT, MIDCOAST)
- Chapter 8.236 — S106 DISTRICT (COMBINING DISTRICT, LADERA)
- Chapter 8.240 — S108 DISTRICT (COMBINING DISTRICT, LOS TRANCOS…
- Chapter 8.244 — S110 DISTRICT (COMBINING DISTRICT, LADERA)
- Chapter 8.248 — AO DISTRICT (AIRPORT OVERLAY DISTRICT)
- Chapter 8.252 — CD DISTRICT (COASTAL DEVELOPMENT DISTRICT)
- Chapter 8.256 — DR DISTRICTS (DESIGN REVIEW DISTRICTS)
- Chapter 8.260 — MH DISTRICTS (MOBILE HOME PARKS)
- Chapter 8.264 — GH DISTRICT (GEOLOGIC HAZARDS DISTRICT REGULAT…
- Chapter 8.272 — E DISTRICT (ENTERTAINMENT OVERLAY DISTRICT)
- Chapter 8.276 — APPROVED SS & PUD DISTRICT REGULATIONS (SPECIA…
- Chapter 8.280 — USE PERMITS.
- Chapter 8.284 — LEGAL LOT REQUIREMENT, ZONING & BUILDING VIOLA…
- Chapter 8.288 — MAJOR DEVELOPMENT PRE-APPLICATION PROCEDURES.
- Chapter 8.292 — RM DEVELOPMENT REVIEW CRITERIA
- Chapter 8.294 — RM-CZ DEVELOPMENT REVIEW CRITERIA
- Chapter 8.296 — DEVELOPMENT REVIEW PROCEDURE
- Chapter 8.300 — FLOOD HAZARD AREAS
- Chapter 8.304 — ARCHITECTURAL SUPERVISION
- Chapter 8.308 — NORTH FAIR OAKS DESIGN REVIEW AND SITE DEVELOP…
- Chapter 8.312 — ZONING, REZONING, LAND DIVISION, IN THE TIMBER…
- Chapter 8.314 — LAND MANAGEMENT PLANNING REQUIREMENTS FOR USES…
- Chapter 8.316 — ZONING, REZONING, LAND DIVISION IN THE TIMBERL…
- Chapter 8.318 — LAND MANAGEMENT PLANNING REQUIREMENTS FOR USES…
- Chapter 8.320 — VARIANCES AND HOME IMPROVEMENT EXCEPTIONS
- Chapter 8.324 — ACCESSORY USES PERMITTED IN ANY “R” DISTRICT.
- Chapter 8.328 — STANDARDS FOR INDUSTRIAL USES IN THE C-1,C-2,M…
- Chapter 8.332 — FENCES, HEDGES, WALLS, HEIGHT & EXCEPTIONS
- Chapter 8.336 — HEIGHT: GENERAL PROVISIONS AND EXCEPTIONS.
- Chapter 8.340 — YARDS: GENERAL PROVISIONS AND EXCEPTIONS
- Chapter 8.344 — OFF-STREET PARKING STANDARDS
- Chapter 8.348 — ACCESSORY BUILDINGS
- Chapter 8.352 — SPECIAL SETBACK LINES
- Chapter 8.356 — HEIGHT OF STRUCTURES AND USES OF AIRSPACE NEAR…
- Chapter 8.358 — HEIGHT OF STRUCTURES AND USE AIRSPACE NEAR SAN…
- Chapter 8.360 — DEVELOPMENT ON LANDS CONTIGUOUS TO RM, RM-CZ, …
- Chapter 8.364 — ROAD IMPROVEMENT REQUIREMENTS IN THE SKYLINE A…
- Chapter 8.368 — SHORT-TERM RENTALS (COASTAL ZONE)
- Chapter 8.372 — CHILD CARE CENTERS
- Chapter 8.376 — WIRELESS TELECOMMUNICATION FACILITIES
- Chapter 8.380 — KEEPING OF ANIMALS & DOMESTIC POULTRY IN
- Chapter 8.384 — CONFINED ANIMAL REGULATIONS
- Chapter 8.388 — ZONING NONCONFORMITIES
- Chapter 8.392 — ACCESSORY DWELLING UNITS
- Chapter 8.396 — ACCESSORY DWELLING UNITS, COASTAL ZONE
- Chapter 8.400 — SIGNIFICANT TREE REGULATIONS
- Chapter 8.404 — HERITAGE TREE REGULATIONS
- Chapter 8.408 — REGULATION OF TIMBER HARVESTING
- Chapter 8.412 — TOPSOIL SITE REGULATIONS
- Chapter 8.416 — SURFACE MINING AND RECLAMATION
- Chapter 8.420 — QUARRIES
- Chapter 8.424 — OIL AND GAS WELL REGULATIONS
- Chapter 8.428 — HISTORIC PRESERVATION PERMITS AND PROCEDURES.
- Chapter 8.432 — INCLUSIONARY REQUIREMENTS FOR AFFORDABLE HOUSING
- Chapter 8.436 — DENSITY BONUS
- Chapter 8.440 — ESTABLISHMENT OF FEES
- Chapter 8.444 — AMENDMENTS
- Chapter 8.448 — FORM OF PETITION, APPLICATIONS, AND APPEALS.
- Chapter 8.452 — ENFORCEMENT, LEGAL PROCEDURES, PENALTIES.