Behold! The New Facebook Headquarters.

@mgsiegler / 10:23 pm PDT • June 15, 2009

Earlier tonight, we spent some time at an open house to show off the new Facebook Headquarters in Palo Alto, California. Previously, the company had its HQ on what’s considered to be Palo Alto’s downtown area on University Ave. But that HQ was spread across a collection of buildings, and at nearly 1,000 employees now, Facebook grew too big for that. It needed a campus.

The new HQ is massive — some 150,000 square feet. It’s in a building that used to be owned by HP, but has been vacant for several years. It’s not only much bigger, but it’s much more open, so employees can actually see who they work with now. Check out the pictures and video of the tour below.