Two listings show up in the same search. Both say Tiburon, CA 94920. Both have bay glimpses, both are a short drive from the ferry, both look, on a portal, like they belong to the same town.
They might not. One could sit inside the incorporated Town of Tiburon, with its own planning department and police force. The other could be in the City of Belvedere, a separate incorporated city with its own city hall a few blocks away. A third could be in Paradise Cay, which has no city government at all and answers instead to the Marin County Board of Supervisors. Same ZIP code. Three different governments deciding who issues your building permit, who responds when you call for help, and who sets the assessment on your tax bill beyond the county rate.
For a buyer comparing Southern Marin neighborhoods, this is the detail that never makes it into a median-price chart. It matters the moment you want to add a dock, remodel a kitchen, or understand why two homes with the same ZIP code can sell on completely different timelines and against completely different comps.
One address, three governments
The Town of Tiburon was incorporated in 1964 and covers most of the peninsula: the Main Street and Ark Row storefronts near the ferry landing, the hillside streets climbing toward Paradise Drive, and the Bel Aire flats along Tiburon Boulevard. It runs its own police department, its own planning and building division, and a five-member elected Town Council.
Belvedere is a separate incorporated city occupying Belvedere Island, Corinthian Island, and the lagoon between them. It has run its own city hall since long before Tiburon existed as a town, and it is home to the San Francisco Yacht Club. Belvedere and Tiburon share a post office, a library, and a recreation agency, which is part of why buyers assume they share a government too. They don't.
Paradise Cay is neither. It's an unincorporated enclave on the peninsula's northeastern shore, formally designated Marin County Service Area No. 29. It was built on Bay landfill in the 1960s, one of the last such projects the Bay Conservation and Development Commission ever allowed. It has no mayor, no council, and no city staff. Services come through the county: building permits go through Marin County's planning department rather than a town hall, fire protection is handled by the Tiburon Fire Protection District out of Station 10 on Paradise Drive, and law enforcement is the Marin County Sheriff's Patrol Division rather than a municipal force.
Here's how the three actually compare once you get past the shared ZIP code:
| Town of Tiburon | City of Belvedere | Paradise Cay | |
|---|---|---|---|
| Governance | Incorporated town, elected Council | Separate incorporated city, own city hall | Unincorporated, Marin County Service Area No. 29 |
| Building permits | Town of Tiburon Community Development | Belvedere city planning | Marin County Planning |
| Police | Tiburon Police Department | Belvedere city services | Marin County Sheriff patrol |
| Fire | Tiburon Fire Protection District | Own city arrangement | Tiburon Fire Protection District, Station 10 |
| Defining geography | Main Street, hillside, Bel Aire flats, Paradise Drive shoreline | Belvedere and Corinthian Islands, the lagoon | Bay-fill lots with private docks and dredged channels |
Notice that fire protection is the one line where Tiburon and Paradise Cay actually line up. Station 10 on Paradise Drive covers both, because fire district boundaries don't follow the same lines as city incorporation. Everything else on this list does.
Why Belvedere's numbers barely move
Search for combined "Belvedere Tiburon" sale data and, as of June 2026, the median sale price across both cities sat just under $6 million, up 45% from a year earlier. That number is close to useless for a buyer aiming at a home in the Town of Tiburon, because it's being pulled upward by a much smaller number of much larger Belvedere sales sharing the same combined data set.
When Belvedere is tracked on its own, the volume problem becomes obvious. The most recent standalone print available, dated February 2026, showed a median sale price of $6.8 million, up 32.5% from the year before, built on just three closed sales that month, up from a single sale the prior February. Months can pass in Belvedere without enough closings to move the number at all.
Three transactions is not a market trend. It's a small sample where one large estate sale can move the median by seven figures in either direction. For a buyer trying to price an offer on a Belvedere property, this means the comps you'd normally lean on carry more noise than signal. An appraiser working a Belvedere file has less to draw from than one working a Tiburon file, which can complicate financing timelines on higher loan amounts. It also means a seller's asking price in Belvedere is less anchored to recent neighborhood sales and more a function of what the specific property, dock, and lot offer, since there may not be three truly comparable sales in the trailing twelve months.
Tiburon proper trades in a different register. Over the three months ending June 2026, homes in the Town of Tiburon sold at a median of $3.4 million, up 2.2% from the same period a year earlier, with 43 homes sold in June alone compared to 31 the year before. That's enough volume to support a real comp set. If your search has been showing you a $3.4 million median for "Tiburon" and you're separately eyeing a Belvedere listing near $6.8 million, you're not comparing two ends of one market. You're comparing two markets that happen to share a mail carrier.
The diligence questions that live only in Paradise Cay
Paradise Cay's roughly 200 to 225 homes sit on filled bay land with private docks on dredged channels, one of the few pockets in Marin where a boat can tie up behind the house. That waterfront access is the community's defining draw, and it's also where the diligence list gets longer than a typical Tiburon purchase.
Because the community has no city government, the questions a buyer would normally direct to a town planning department instead go to Marin County. Dock rights and channel depth are governed separately from the house itself, since the marina and canals require periodic dredging to stay navigable. The community's shared costs, from canal maintenance to common area upkeep, run through the County Service Area's special assessments and a resident advisory structure rather than a conventional HOA board, though buyers should still expect and budget for that ongoing cost. None of this is a red flag. It's simply a different diligence checklist than a hillside home in the Town of Tiburon would require, and it's easy to miss if you assume every 94920 address answers to the same building department.
The market you probably pictured is Tiburon proper
When most buyers say they want to live in Tiburon, they're picturing the incorporated town: walking to coffee near Main Street, the ferry commute, the hillside streets above downtown, maybe a flat-lot home in Bel Aire close to the schools. That's the segment with the deepest transaction history and the most reliable comps, and it's the one where June 2026's 43 closed sales give a buyer's agent real ammunition for a negotiation.
It's also worth remembering that Tiburon, Belvedere, and part of Corte Madera share the Reed Union School District, so district boundaries cross the same incorporation lines that everything else does. A family choosing a school attendance area isn't choosing a single city government to go with it.
What this means before you tour
A few questions are worth asking before you fall for a listing photo:
- Which jurisdiction issues the building permit for this address: the Town of Tiburon, the City of Belvedere, or Marin County?
- If there's a dock, is it governed by a city, an HOA, or a County Service Area assessment?
- How many comparable sales closed in this specific submarket in the past twelve months, not just in the broader 94920 ZIP?
- Does the answer change your renovation timeline, since a county permit process can move on a different schedule than a town one?
None of these questions show up on a portal listing page. They show up in escrow, usually later than a buyer would like.
A few questions worth asking directly
Is Paradise Cay part of the Town of Tiburon? No. It's an unincorporated community surrounded by the Town of Tiburon but governed separately as Marin County Service Area No. 29. Building permits and most municipal services run through Marin County, not a Tiburon town office.
Does Belvedere have its own police department separate from Tiburon's? Yes. Belvedere is a distinct incorporated city with its own city hall and its own municipal services, even though it shares a post office, library, and recreation agency with neighboring Tiburon.
Why do Belvedere home prices swing so much more than Tiburon's from month to month? Volume. Belvedere closes only a handful of sales in a typical month, sometimes as few as one to three, so a single high-value transaction can shift the median sharply. Tiburon's broader transaction count, over 40 closed sales in a recent month, produces a steadier trend line.
Does Paradise Cay have its own fire department? No, and it doesn't need one. Paradise Cay is covered by the Tiburon Fire Protection District out of Station 10 on Paradise Drive, the same district that serves the Town of Tiburon, since fire district lines don't follow city incorporation lines the way police and permitting do.
Buying on the Tiburon peninsula means buying into whichever of these three governments actually holds the deed records for that address, and the difference shows up in permitting timelines, comp availability, and who picks up the phone when something needs fixing. If you're comparing homes across Tiburon, Belvedere, and Paradise Cay and want a clear read on which jurisdiction, price tier, and diligence checklist fits what you're looking for, Sharon Kramlich can walk you through the specifics property by property. Request a complimentary home evaluation to start with a clear picture of what you'd actually be buying.
