The King Mountain Estate is located in Kentfield on a foothill just west of Mt. Tamalpais, amid tens of thousands of acres of public open space. Yet, the estate is only 12 miles north of the Golden Gate Bridge.

The 140-acre ridgetop parcel was once owned by Herb Boyer, the co-founder of Genentech. The 32-acre primary building envelope straddles the ridgeline to offer panoramic views.

The property will be auctioned next month via Concierge Auctions in cooperation with agent Steven Mavromihalis of Compass Real Estate. Currently listed for $25 million, the property will sell with no reserve to the highest bidder between April 22 to 27 via the firm’s digital marketplace.

“Though there are many incredible homesites in the Bay Area, there’s only one King Mountain Estate,” says Chad Roffers, Concierge Auctions chairman. “There is simply nothing else like it. The possibilities are endless. For properties valued over $10 million, let alone $25 million-plus, the buyer pool is particularly limited.”