Publicity-shy San Francisco developer Jay Paul has built 8 million square feet of office space in Silicon Valley, and has 6 million more in the pipeline. His high-end office towers have attracted companies such as Google, Amazon and Microsoft as tenants. Google, which already leases 1.2 million square feet from his privately-held Jay Paul Company, will start taking over its new 1.9 million square foot Moffett Place development in Sunnyvale, Calif. in late 2015. Paul’s first project in the city of San Francisco, expected to open in 2017, will reshape the city’s skyline with the tallest mixed-use tower west of the Mississippi. Paul lives in San Francisco’s affluent Pacific Heights neighborhood and owns two yachts.