https://www.siliconvalley.com/2019/09/22/sunnyvale-welcomes-one-of-the-biggest-facebook-campuses/

Eighteen months after signing the lease, Facebook on Sept. 18 officially opened the first of its three office buildings planned for Sunnyvale’s Moffett Park.

The other two buildings are slated to open by March 2021 in the office park, located on Discovery Way. At more than 1 million square feet, the Sunnyvale campus will be “one of the biggest … in the history of Facebook,” John Tenanes, Facebook’s vice president of global facilities and real estate, said at last week’s ribbon-cutting ceremony.