Image via Google Maps: g.co/maps/86g8b
Estimated server count: 250,560
Opened September 2008. Looks like there's space for a third building in the middle there. Perhaps the third building exists now but didn't when the satellite image was taken. The building on the right looks like it might be only half-built, it's missing cooling systems on its south side. But maybe it has only half the capacity of the building to the left.
Someone tried to check in here on Foursquare, but was met by a gate and a guard.
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Google's own page about this data center: google.com/datacenters/berkeley-county