A mystery company backed by Silicon Valley billionaires has purchased tens of thousands of acres of land for more than $800 million to build a new city near San Francisco

A mystery company backed by Silicon Valley billionaires has purchased tens of thousands of acres of land for more than $800 million to build a new city near San Francisco::A company called Flannery Associates has been buying up land in Solano County for up to $15,000 per acre, court documents show.