399–419 Belvedere Avenue

Belvedere Island is defined by scarcity: very little land, tightly held, with the most compelling sites looking across San Francisco Bay. This offering gathers four contiguous developable waterfront parcels—399, 401, 415, and 419 Belvedere Avenue—into approximately 2.75 acres.

The individual parcels range from approximately 0.52 to one acre, giving the holding unusual flexibility. Together, they create the scale for a singular private estate or a considered multi-residence plan, subject to local review and approvals. Kept separately, they preserve another kind of value: optionality in one of Marin County’s most constrained residential markets.

The outlook supplies the drama. The land takes in Richardson Bay and San Francisco Bay, with sightlines toward the Golden Gate Bridge, the city skyline, and Mount Tamalpais. On Belvedere, where orientation can matter as much as acreage, the horizon becomes part of the property’s architecture before a house is drawn.

Offered at $30 million, the proposition is land in its rarest local form: contiguous, waterfront, and large enough to create a legacy address. Lydia Sarkissian, Magda Sarkissian, and William Bullock of Golden Gate Sotheby’s International Realty represent the offering.

The ownership perspective

The number of parcels matters as much as the total acreage. Four contiguous sites can be considered together, yet their separate boundaries remain important to any future plan. The offering’s appeal is therefore partly visual and partly organizational: it gathers a waterfront setting into a holding that deserves to be understood at both scales.

The word developable should not be read as a completed design brief. A future residence or collection of residences would need to respond to site conditions, access, local requirements, and the relevant approvals. The existing value of the story is the land assembly itself. Its eventual architecture remains a question for the buyer and the professionals who investigate the sites.

Source and photography: Golden Gate Sotheby’s International Realty — property XC6Q67. Property details reflect the verification date and may change.