81 Mount Tiburon Road, Tiburon, CA 94920
View the full MLS photo gallery and listing details
Listed by Susan Hewitt and C.J. Nakagawa, Golden Gate Sotheby’s International Realty. MLS #326053863 (BAREIS). For more information or to schedule a tour, contact Matthew Martinez at Diamond Real Estate Group.
At a glance
| Detail | As listed | What it describes |
|---|---|---|
| List price | $13,500,000 | Asking price for a pre-purchase during renovation |
| Bedrooms and baths | 5 bedrooms, 4 full and 1 half bath | The planned home after the expansion |
| Living area | About 4,501 sq ft | The planned home; the existing residence is listed at about 3,599 sq ft |
| Lot | About 41,578 sq ft (0.95 acre), flag lot | The parcel |
| Year built | 1970 | The existing structure |
| Target completion | Summer 2027 (per the listing) | A target, not a guaranteed date |
| Plans, engineering, permits | In progress (per the listing) | Not yet complete at the time of listing |
| Parking | 2-car garage | As listed |
| Views (as listed) | San Francisco skyline, Bay Bridge, Golden Gate Bridge, Angel Island, Mt. Tamalpais | Confirm from the finished floor levels and outdoor areas |
| School districts (as listed) | Reed Union Elementary; Tamalpais Union High | Confirm attendance with each district |
Open the live MLS listing for current status, price, photos and update information. Listing courtesy of Susan Hewitt and C.J. Nakagawa, Golden Gate Sotheby’s International Realty. MLS #326053863.
Listing details as published on the MLS and listing brokerage pages, checked October 31, 2026. Information is deemed reliable but not guaranteed and should be independently verified.
What is being sold at 81 Mount Tiburon Road
81 Mount Tiburon Road is listed as a pre-purchase opportunity: a buyer would contract for the property while a renovation and expansion is underway. The listing describes taking the existing residence of about 3,599 square feet to about 4,501 square feet, with five bedrooms, a primary suite, guest accommodations, indoor-outdoor entertaining space, level lawn areas and a pool, on a site of nearly one acre in the Mount Tiburon area.
The listing also says that plans, engineering and permitting are still in progress, that completion is targeted for summer 2027, and that renderings and some images are architectural visualizations of the proposed design. That distinction drives everything else on this page. Part of what a buyer pays for is a finished home that does not exist yet, so the contract, the approvals and the construction obligations matter as much as the setting.
Existing home versus proposed home
Keep two property descriptions side by side throughout due diligence:
| Question | Existing residence | Proposed residence |
|---|---|---|
| Size and layout | About 3,599 sq ft, built 1970 | About 4,501 sq ft, 5 bed / 4.5 bath |
| Evidence that it exists | Records, inspection, site visit | Plans, approvals, construction contract |
| Images | Photos of the current house, if provided | Renderings (architectural visualizations) |
| What could change | Condition found during work | Design, scope, cost, timing, approvals |
| What protects the buyer | Inspection and disclosure rights | Purchase-contract terms covering scope, completion and remedies |
The listing data mixes the two. For example, one portal shows the existing 1970 structure next to the planned bedroom count and square footage. Price comparisons, insurance quotes and lender appraisals all depend on which description is being used.
Questions a buyer should resolve before writing an offer
- What exactly is the seller obligated to deliver? Ask for the plans and specification set the listing offers on request, and make sure the contract ties delivery to those documents, including allowances, finish standards and who approves substitutions.
- Where are the approvals? Ask the Town of Tiburon Planning Division for the current application file and any design review decisions for the address, and confirm building-permit status separately. Planning approval, building permits and final sign-off are different milestones. Contact the Town of Tiburon Planning Division by phone at (415) 435-7390.
- What happens if completion slips past summer 2027? Ask for outside dates, extension terms and remedies in writing.
- How is the purchase price paid and protected? Find out whether the deal closes now with construction afterward, or closes at completion, and how deposits are held. That question is for your attorney and lender as much as your agent.
- What will insure and finance the property during and after construction? Get insurance quotes early. See our guides on homeowners insurance during escrow and the California FAIR Plan.
- Which hazard disclosures apply to the parcel? Review the natural hazard disclosure report, including fire-hazard and geologic information for the hillside site, and any defensible-space requirements.
- Which views are protected? A view from today’s structure, or from a rendering, is not the same as a view from the approved finished floor levels. Confirm the approved heights, and ask about trees on neighboring land that could affect views.
Price, public records and comparison
The asking price of $13,500,000 works out to about $2,999 per square foot of the planned 4,501 sq ft. Per-square-foot figures for a home that has not been built are a rough guide only. A listing portal also shows a recorded sale of the property on October 8, 2025, at $4,500,000. Verify recorded transfers with a title company or the Marin County Assessor-Recorder, not from portal summaries.
A defensible price comparison for this property separates three things: the land and its view, the value of a completed home of the delivered quality, and the cost and risk the buyer takes on until completion. Recent Tiburon sales of finished view homes are evidence for the second, not a substitute for the third. Our comparative market analysis guide explains how we document those choices.
Mount Tiburon and the Town of Tiburon
Mount Tiburon Road is in the Town of Tiburon on the Tiburon Peninsula in southern Marin County. Our Tiburon real estate guide covers the town’s housing types, hillside records and how to check jurisdiction, and the Marin County guide covers countywide rules. For nearby comparisons, see Belvedere and our Marin luxury homes page.
Related Tiburon guides:
- Tiburon hillside access and inspection records
- Tiburon existing-home renovation research
- Tiburon homeownership annual budget
- Buying a luxury home
Schedule a tour of 81 Mount Tiburon Road
For more information about 81 Mount Tiburon Road or to schedule a tour, contact Matthew Martinez, Founder, CEO & Managing Broker, California DRE #01869679, at (800) 661-5080 or through the form below.
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Questions about 81 Mount Tiburon Road
How much is 81 Mount Tiburon Road listed for?
It is listed at $13,500,000 (MLS #326053863). Check the live listing status above, since price and status can change.
How big is the home?
The listing describes the existing residence at about 3,599 square feet and the planned, expanded home at about 4,501 square feet with five bedrooms, four full baths and one half bath. Lot size is listed at about 41,578 square feet, or 0.95 acre.
Is the house finished?
No. It is offered as a pre-purchase during renovation and expansion, with completion targeted for summer 2027 and plans, engineering and permitting described as in progress at listing.
Are the photos real or renderings?
The listing says renderings and select images are architectural visualizations of the proposed design. Ask which images show the current property and which show the plan.
Who is the listing agent?
Susan Hewitt and C.J. Nakagawa of Golden Gate Sotheby’s International Realty. For more information or to schedule a tour, contact Matthew Martinez at Diamond Real Estate Group.
What views does the property have?
The listing names views of the San Francisco skyline, Bay Bridge, Golden Gate Bridge, Angel Island and Mt. Tamalpais. Confirm which rooms and outdoor areas have which views once the approved floor levels are known.
Which schools serve 81 Mount Tiburon Road?
The listing names the Reed Union Elementary and Tamalpais Union High school districts. Attendance assignments can change, so confirm them directly with each district.
Can I see the plans and permits?
The listing says plans, specifications and development details are available on request, and permit and design-review records come from the Town of Tiburon. Contact Matthew Martinez for more information.
Does it have a pool?
A pool is part of the planned design described in the listing. Some MLS fields also show a pool, so confirm whether one exists today and what the contract requires to be delivered.
How do I schedule a showing?
Contact Matthew Martinez at Diamond Real Estate Group or call (800) 661-5080 to schedule a tour or get more information.
What is your Tiburon property worth?
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Listing information from the MLS and listing brokerage, checked October 31, 2026; deemed reliable but not guaranteed. Renderings are architectural visualizations of a proposed design. Square footage, bedroom and bathroom counts describe the planned home unless stated otherwise. This page is not an offer of the property and does not describe the condition of any improvement.
