At the southern tip of Belvedere Island, a slope covered in black lava rock is listed for $30 million, with a view of the Golden Gate Bridge and the San Francisco skyline — but no house, SFGATE reported.

Known as the Lava House site, the four parcels at 399, 401, 415 and 419 Belvedere Ave. are being sold together. They cover about 2.75 acres, putting the asking price at nearly $11 million an acre. A Chicago seat-belt magnate spent two decades trying to build a house there, the site reported.