Systinet moved to Five Cambridge Center (Kendall Square/MIT) back in 2002 and it was a great place for a hi-tech startup. No surprise, then, that Google moved to the same location six years later:
Google Cambridge
5 Cambridge Center, Floors 3-6
Cambridge, MA 02142
Roman Stanek's Push-Button Thinking 
Not to mention VMware’s office which spreads 3-4 floors there today similarly to Google 🙂