One of One. Rarely does a property combine architectural significance, extraordinary scale, and a true beachfront setting so effortlessly. Set directly on the San Francisco Bay in Tiburon, La Casa Dei Quattro Orizzonti (the House of the Four Horizons) is a remarkable 6,721 sq. ft., 5-bedroom, 5-bath modern estate offering exceptional privacy and seamless single-level living on a 5.33 acre mostly level lot that flows directly to the white sand beach and the Bay. Designed by noted Italian architect Andrea Ponsi, featured in numerous architectural and design publications, and built ground-up by Red Horse Constructors, the residence draws inspiration from California mid-century modernism. Conceived as four pavilions arranged around a serene interior garden courtyard, the home is defined by extraordinary scale, abundant natural light, strong architectural sight-lines and expansive, retracting walls of glass that create a continuous connection between indoors and out. The thoughtful design provides exceptional separation between grand scale public living spaces, the private primary wing, guest accommodations, and functional spaces including a 3-car garage. An art collector's dream, the public areas incorporate extensive gallery space while maintaining an open, light-filled environment for everyday living and entertaining. Distinctive design details enhance the spaces, including copper accents, custom lighting, vaulted ceilings, and modern Italian cabinetry. A dramatic central axis draws the eye from the entry through the home to the water, while expansive terraces and decks step gently toward the shoreline, where water activities, a spa, and the beach beckon. The gardens abound - from an orchard garden at the entry and a private Japanese garden adjoining the primary wing to flower and herb gardens and the native landscape along the Bay. Conceived in harmony with its exceptional setting, the eco-friendly home incorporates passive solar strategies, natural ventilation, photovoltaic solar and environmentally conscious materials, including ipe wood-slat ventilated exterior walls, copper roofing, and solar glass canopies. Private yet remarkably accessible, this is a singular Tiburon beachfront estate: an exceptional convergence of significant architecture, sustainable design, single-level living and an intimate connection to the San Francisco Bay.
Active
$17,500,000
36 Old Landing Road, Tiburon, CA 94920
5beds
6,721sqft
Single Family Residence
Built in 2006
5.34 Acres Lot
$-- Zestimate®
$2,604/sqft
$-- HOA
What's special
True beachfront settingFlower and herb gardensAbundant natural lightExtensive gallery spaceStrong architectural sight-linesSolar glass canopiesModern italian cabinetry
- 13 days
- 5,325
- 399
Zillow last checked:
Listing updated:
Listed by:
Stephanie Lamarre DRE #01840604 415-806-3176,
Golden Gate Sotheby's 415-464-9300
Source: BAREIS,MLS#: 326070321
Originating MLS: Marin County
Originating MLS: Marin CountyFacts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 5
- Bathrooms: 5
- Full bathrooms: 4
- 1/2 bathrooms: 1
Rooms
- Room types: Baths Other, Family Room, Great Room, Guest Quarters, Kitchen, Laundry, Living Room, Master Bathroom, Primary Bedroom 2+, Office
Primary bedroom
- Features: Ground Floor, Outside Access, Walk-In Closet(s)
- Level: Main
Bedroom
- Level: Main
Primary bathroom
- Features: Closet, Radiant Heat, Shower Stall(s), Steam, Tile, Tub, Walk-In Closet(s), Window
Bathroom
- Features: Closet, Outside Access, Radiant Heat, Tile, Tub w/Shower Over, Window
- Level: Main
Dining room
- Features: Dining/Living Combo, Formal Area
- Level: Main
Family room
- Features: View
- Level: Main
Kitchen
- Features: Butlers Pantry, Island w/Sink, Pantry Cabinet, Pantry Closet, Quartz Counter, Skylight(s)
- Level: Main
Living room
- Features: Cathedral/Vaulted, Deck Attached, Great Room, Open Beam Ceiling, View
- Level: Main
Heating
- Radiant Floor
Cooling
- Whole House Fan
Appliances
- Included: Built-In Electric Oven, Built-In Gas Range, Built-In Refrigerator, Dishwasher, Disposal, Gas Cooktop, Gas Water Heater, Range Hood, Microwave, Dryer, Washer
- Laundry: Cabinets, Ground Floor, Inside Room, Sink, Space For Frzr/Refr
Features
- Formal Entry, Open Beam Ceiling, Storage
- Flooring: Cork, Tile
- Basement: None
- Number of fireplaces: 1
- Fireplace features: Gas Starter, Living Room
Interior area
- Total structure area: 6,721
- Total interior livable area: 6,721 sqft
Video & virtual tour
Property
Parking
- Total spaces: 10
- Parking features: Attached, Garage Faces Front, Guest, Side By Side, Uncovered Parking Spaces 2+
- Attached garage spaces: 3
- Uncovered spaces: 7
Features
- Levels: One
- Stories: 1
- Patio & porch: Covered, Enclosed, Deck, Patio
- Exterior features: Uncovered Courtyard
- Spa features: In Ground
- Fencing: Entry Gate,Fenced,Front Yard,Partial,Wood,Security
- Has view: Yes
- View description: Bay, Bridge(s), City, City Lights, Garden/Greenbelt, Hills, Panoramic, Ridge, Water
- Has water view: Yes
- Water view: Bay,Water
- Waterfront features: Navigable Water
Lot
- Size: 5.34 Acres
- Features: Auto Sprinkler F&R, Cul-De-Sac, Dead End, Garden, Greenbelt, Landscaped, Landscape Front, Landscape Misc, Private, Other
Details
- Parcel number: 03817166
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Modern/High Tech
- Property subtype: Single Family Residence
Materials
- Roof: Bitumen,Metal
Condition
- Year built: 2006
Utilities & green energy
- Sewer: Public Sewer
- Water: Public, Water District
- Utilities for property: Cable Available, Internet Available, Public
Green energy
- Energy efficient items: Construction
- Energy generation: Solar
Community & HOA
Community
- Security: Carbon Monoxide Detector(s), Double Strapped Water Heater, Fire Alarm, Fire Suppression System, Security Fence, Security Gate, Smoke Detector(s), Video System
HOA
- Has HOA: No
Location
- Region: Tiburon
Financial & listing details
- Price per square foot: $2,604/sqft
- Tax assessed value: $8,979,408
- Date on market: 9/10/2026
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 9/11/2026 | Listed for sale | $17,500,000+400%$2,604/sqft |
Source:  BAREIS #326070321 Report a problem | ||
| 10/19/2004 | Sold | $3,500,000+27.4%$521/sqft |
Source: Public Record Report a problem | ||
| 8/11/2004 | Sold | $2,747,000$409/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2026 | -- | $8,979,408 +2% |
| 2025 | $98,909 +3.9% | $8,803,371 +2% |
| 2024 | $95,227 +1.7% | $8,630,813 +2% |
| 2023 | $93,641 +1.2% | $8,461,604 +2% |
| 2022 | $92,504 +1.6% | $8,295,743 +2% |
| 2021 | $91,065 +0.1% | $8,133,101 +1% |
| 2020 | $90,957 +1.2% | $8,049,743 +2% |
| 2019 | $89,878 +1.3% | $7,891,959 +2% |
| 2018 | $88,708 +1.4% | $7,737,261 +2% |
| 2017 | $87,473 +4.3% | $7,585,585 +2% |
| 2016 | $83,884 -0.4% | $7,436,895 +1.5% |
| 2015 | $84,253 +3.3% | $7,325,238 +2% |
| 2014 | $81,601 | $7,181,800 +0.5% |
| 2013 | -- | $7,149,397 +2% |
| 2012 | -- | $7,009,242 +2% |
| 2011 | -- | $6,871,847 +0.8% |
| 2010 | -- | $6,820,499 -0.2% |
| 2009 | -- | $6,836,719 +46.7% |
| 2008 | -- | $4,660,424 +29.3% |
| 2007 | -- | $3,605,540 +1% |
| 2006 | -- | $3,570,000 +2% |
| 2005 | -- | $3,500,000 +3097.7% |
| 2004 | -- | $109,453 +1.9% |
| 2003 | -- | $107,446 +2% |
| 2002 | -- | $105,341 +2% |
| 2001 | -- | $103,276 |
Find assessor info on the county website
Monthly payment
Est. payment
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.Climate risks
Neighborhood: 94920
Nearby schools
Schools provided by the listing agent
- District: Reed Union
Source: BAREIS. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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