San Francisco owns a big chunk of the bay. They could fill it in. With proper construction, earthquake-induced ground liquification is of no concern. (build lik

San Francisco owns a big chunk of the bay. They could fill it in. With proper construction, earthquake-induced ground liquification is of no concern. (build like a boat) If you really want "green field" space, of course there is that too. Golden Gate Park is huge. The Presido is huge.