Every buyer touring a waterfront home on the Tiburon Peninsula asks the same question the moment they spot a private dock: is it included, and is it in good shape? That's the right question to ask about the wood and the pilings. It's the wrong question to ask about value.

The number that actually determines what a Paradise Cay dock is worth on closing day has nothing to do with the boards under your feet. It has to do with a cycle that started long before the home went on the market, one most listing sheets never mention and most buyers never think to ask about until low tide leaves their draft stuck in the mud.

That cycle belongs to Paradise Cay itself, and it's worth understanding before you write an offer.

A Neighborhood Governed By A Sediment Problem

Paradise Cay sits at the foot of the Tiburon Peninsula, an unincorporated enclave of just over 200 homes fully surrounded by the town of Tiburon but governed on its own terms. It was built in the early 1960s as one of the last landfill projects the state allowed in San Francisco Bay, turning tidal marsh into finger canals wide enough that many of the resulting docks can hold a 60-foot yacht, according to the community's Wikipedia entry.

None of that history would matter for a buyer's due diligence list if bay mud stayed put. It doesn't. Every canal in Paradise Cay collects sediment continuously, so Marin County created County Service Area No. 29, known locally as CSA 29, specifically so residents could tax themselves to dig the channels back out. The county's own CSA 29 page is direct about the arrangement: the Board of Supervisors set it up to let parcels within Paradise Cay pass special assessments and special taxes for projects like dredging. That tax rides on the annual property tax bill rather than arriving as a homeowners association invoice, which means it attaches to the parcel and survives resale automatically. A new owner doesn't opt in or out. They inherit whatever the CSA has already committed to.

The Cycle, Not The Calendar Year

Marin County Public Works describes the maintenance rhythm plainly on its Paradise Cay pages: sediment removal in CSA 29 happens roughly every four to five years. The county's own document archive shows a completed dredge cycle around 2020, with pre- and post-dredge condition surveys on file, and the next round began in the summer of 2024. That 2024 project was budgeted at an estimated $998,000, scheduled to start in mid-August and run about six weeks, with the dredged material barged to the Alcatraz Island Disposal Site under Army Corps of Engineers permit conditions, according to the county's maintenance dredging project page.

Line those two rounds up and the gap is closer to four years than five:

1. 2020 — the county's condition surveys record a completed maintenance dredge across Paradise Cay's canals.
2. 2024 — the next round funds and mobilizes, running roughly six weeks at just under a million dollars.
3. 2026 — a buyer closing escrow today is roughly two years into a cycle that recent history suggests won't reset for another two years or so.

That timing gap is the number worth sitting with, because it means two nearly identical Paradise Cay listings aren't actually equivalent just because they both have docks. A home that closed right after the 2024 dredge and one closing today are sitting at different points on the same depth curve, and only one of those points shows up cleanly in a home inspection. Usable depth at low tide erodes steadily between dredges. A dock that clears comfortably in year one can feel tight by year three, with no visible change to the structure itself.

The Permit Nobody Mentions At The Open House

CSA 29 holds standing ten-year permits from the San Francisco Bay Conservation and Development Commission and the Army Corps of Engineers, covering its community-wide dredging work. Those permits cover the channels. They don't cover your dock.

Any repair, extension, or rebuild of an individual dock in Paradise Cay sits outside that community permit and needs its own approval, typically through the town's own process, before a contractor can start work. Tiburon maintains a specific tidelands permit application for exactly this kind of shoreline work. A seller who mentions a "recently repaired dock" as a selling point has told you about the lumber. They haven't told you whether the repair went through that process. Ask for the permit record, not the receipt. If nobody can produce one, budget for the possibility that your first project as the new owner will be clearing the same paperwork from scratch, on your timeline instead of the previous owner's.

Why This Gets Skipped More Often When Prices Rise

Belvedere Tiburon sale prices climbed through the first quarter of 2026, with the median reaching $3.3 million across 38 closed sales, up more than 25 percent from the same quarter a year earlier. Rising prices in a tight inventory market tend to push buyers toward waived contingencies and shorter inspection windows. That's exactly the environment where a CSA 29 status check or a dock permit request gets skipped in the rush to compete for a limited number of waterfront parcels. The dock is the most photogenic line item on the listing. It's also the one most likely to carry an obligation nobody priced into the offer.

What To Actually Ask Before You Remove Contingencies

• When was the canal outside this specific parcel last dredged, and can you get the CSA 29 condition survey or post-dredge report for that year?
• Is the CSA 29 special tax current on the parcel? It rides with the property tax bill and doesn't reset at sale.
• Does the dock have its own permit record, separate from CSA 29's community-wide permits, for any repair or modification made to it?
• What is the dock's usable depth at low tide, not high tide? Listing photos are rarely taken at low water.
• Is there a dredging vote or budget discussion scheduled with the current CSA 29 advisory board? Assessments can shift ahead of a newly funded project.

A Few Questions Buyers Ask First

Is CSA 29 the same as a homeowners association? No. It's a county service area created by the Marin County Board of Supervisors, and its special tax is collected with the property tax bill rather than through membership dues you could choose to skip.

Does the dredging assessment show up on a standard title search? Not always in a form that flags its purpose clearly. Ask your escrow officer to confirm CSA 29 status specifically rather than assuming it's covered inside the broader county tax line.

What if my dock needs work between dredging cycles? It will likely need its own permit through the town's tidelands process, independent of whatever CSA 29 has already secured for the channels themselves.

A private dock in Paradise Cay is one of the rarer things Marin waterfront living offers, and it earns the extra half hour it takes to check where a property actually sits in the county's cycle before an offer goes in. Elizabeth Green Kilgore has spent nearly two decades working waterfront transactions on the Tiburon Peninsula and can walk you through what a specific dock, and a specific tax bill, actually means for your purchase. Request a Personalized Market Consultation before you write that offer.