Commercial Real Estate in Cobb: Highway 175 Village Centers, Mountain Resorts and Geothermal Land

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

Cobb is an unincorporated mountain community on Cobb Mountain in southern Lake County, strung along Highway 175 between Middletown and Kelseyville. Commercial property here is small: a few stores and services at the Cobb and Loch Lomond centers, historic resorts and retreats, water bottling sites, and geothermal operations on the Geysers side of the mountain. Lake County sets the zoning. Fire risk, water service and septic capacity usually decide what is feasible, so confirm each with the county and the local districts before you buy.

Who controls the parcel

Land use: Lake County, under the county zoning ordinance and the Cobb Mountain Area Plan. The version the county posts is labeled a May 1989 preliminary draft, so ask Community Development which policies are in force.
Water: The Cobb Area County Water District now runs much of the community’s water. After the 2015 Valley Fire, seven small systems merged into it in August 2018: Adams Springs, Pine Grove, Starview, Bonanza Springs, Mt. Hannah, Branding Iron and Hill 9 and 10. Cobb Mountain Water Company joined in July 2021. The State Water Board describes the district as serving about 1,000 connections and a population of about 3,300. Some parcels are still on private wells or other systems.
Sewer: The area plan treats on-site wastewater as a key issue around the population centers, and most parcels use septic.
Fire: The area plan places Cobb Valley, Hobergs and Loch Lomond in the South Lake County Fire Protection District, with volunteer stations at Cobb and Loch Lomond. State fire protection handles wildland fires. Nearly the whole planning area was rated very high wildland fire hazard. Lake LAFCo’s 2025 fire review lists South Lake County’s special tax at $236 plus CPI.

What business zoning looks like on Cobb Mountain

Commercial districts are rare here. The area plan says that apart from geothermal activity, the planning area has no service commercial or industrial land uses. These are the county districts most likely to apply:

District	Intended uses	Notes
C1 Local Commercial	Small stores and services for nearby homes	By right up to 2,000 sq ft per use, 6 a.m. to 10 p.m.
C2 Community Commercial	Broader retail and restaurants	By right up to 5,000 sq ft per use. Needs 40,000 sq ft on a well and septic
CR Resort Commercial	Resorts, lodging, restaurants	Motels up to 15 units by right. RV parks and campgrounds by major use permit
RL Rural Lands / RR Rural Residential	Large-lot rural land	Cottage industry and some ag-related uses by permit
TPZ Timberland Preserve	Timber management	Mapped on forested slopes

Most commercial parcels here rely on wells and septic, so the 40,000-square-foot minimum is common. Expect parcels at the village centers to be legal nonconforming.

Village centers, Highway 175 and the resorts

The area plan describes Cobb’s commercial character:

Two retail centers. Retail sits near the centers of Cobb and Loch Lomond. The plan expects local business areas to become community focal points for nearby neighborhoods. It asks for careful thought before more strip commercial development.
Highway 175 design. The plan calls for a special design review program for the central commercial area of Cobb Valley along Highway 175. It also supports county scenic highway status for Highway 175 and Bottle Rock Road. Industrial and service commercial uses along the highway would need screening and setbacks.
Resorts and retreats. The plan lists resorts at Howard Springs, Loch Lomond, Pine Grove, Salminas and Whispering Pines. Hobergs and Seigler Springs have become retreats, and Adams Springs appears as a historic resort. A buyer of a resort property should confirm which lodging and assembly uses are legally established.
Water bottling. The plan notes several bottling operations. Spring water rights and any use permits are key diligence items.

Geothermal, fire and other Cobb-specific rules

The Geysers. Cobb Mountain holds Lake County’s share of The Geysers, and the whole planning area lies within the known geothermal resource area. The plan promotes separating high-temperature geothermal uses from homes. Most geothermal wells must be at least half a mile from residential areas and generally 500 feet from blueline streams. County Article 27 sets parcel minimums for geothermal projects: five acres for research wells and 20 acres for exploratory well projects. It also promotes direct-use geothermal, such as heating, which the plan says much of the area could support.
Air quality. The plan reports hydrogen sulfide odor complaints north of the mountain from geothermal operations.
Wildfire. The plan predates the 2015 Valley Fire, which destroyed much of Cobb. The State Water Board reports that the fire cost the water district 38% of its customers, and the Starview system 87%. Insurance, defensible space and fire-flow capacity can decide whether a commercial rebuild pencils.
Septic. The plan calls for monitoring where pre-1985 septic systems exceed one unit per acre and for tracking system failures in the Cobb area. Food service and lodging need septic designed for the load.

Home businesses and cottage industry

Many Cobb businesses run from homes or small rural parcels. Under Article 27, a home occupation outside small R1, R2 and SR lots can have one employee per two acres, up to five. A cottage industry needs a minor use permit. It must be resident-run, with up to two outside employees, working inside a building of 1,200 square feet or less. Bed and breakfasts with two rooms need a zoning permit. Inns with three to eight rooms are a Table B use.

Transfer tax, business tax and property tax

Cobb is unincorporated, so the county documentary transfer tax of $1.10 per $1,000 applies under the Assessor-Recorder fee schedule. Lodging pays the county’s 9% TOT. A sale generally triggers Proposition 13 reassessment, and the fire special tax and water district charges appear on the bill. We did not verify a county business license tax.

Due diligence that matters in Cobb

Start with our commercial due diligence checklist, then add:

Confirm the county district and any legal nonconforming status at the Cobb or Loch Lomond center.
Identify the water source: Cobb Area County Water District, a private well or spring rights.
Get a septic evaluation sized for the intended commercial load.
Check fire hazard zoning, defensible space and insurability, and look up any Valley Fire rebuild permits.
For resorts, document the legally established lodging, events and RV or camping uses.
For land near geothermal leases, review setbacks and any surface agreements.

Questions people ask

Who handles zoning in Cobb?

Lake County Community Development, under the county ordinance and the Cobb Mountain Area Plan.

Where are Cobb’s stores and services?

The area plan places retail near the centers of Cobb and Loch Lomond on Highway 175.

Is there industrial land in Cobb?

The plan reports no service commercial or industrial land uses apart from geothermal activities.

Who provides water?

Much of Cobb is served by the Cobb Area County Water District, formed from seven systems consolidated in 2018.

Can I run a business from my Cobb home?

Yes, as a home occupation. Larger rural parcels allow more employees, and a cottage industry needs a minor use permit.

Is the transfer tax different here?

No. Only the county’s $1.10 per $1,000 applies.

Does Diamond handle commercial property in Cobb?

Contact Matthew Martinez to discuss buying, selling or leasing commercial property in Cobb.

Sources & notes

Note: The posted area plan is a 1989 draft that predates the Valley Fire. Parcel zoning at the Cobb and Loch Lomond centers was not confirmed on the county GIS map. The RL, RR and TPZ articles were not reviewed in detail.

This page is general information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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