Paul Chinn/The San Francisco Chronicle; Jemal Countess/Getty Images for TIME; Michael Kovac/Getty Images for Vanity Fair
- A company called Flannery Associates has been purchasing land in a county near San Francisco.
- The company has spent up to $15,000 per acre, court documents show.
- Silicon Valley has long sought to build a new city from scratch.
A mystery company backed by Silicon Valley billionaires has been snatching up land in a northern California county in an apparent bid to build an entirely new city in the state.