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Twitter, San Francisco 2

"A revitalized building like SF Mart offered Twitter several key advantages,” Ed Axelsen, Twitter’s director of facilities, said in a statement. “It's centrally located for public transportation; the building has lots of light, it has huge floor plates, it offered the possibility of outdoor space; and perhaps most appealing, it's an historic building that is being revitalized for modern use." Click here to see the full list of Coolest Corporate Headquarters.

Coolest Corporate Headquarters

Now that corporate norms no longer apply across the board, nontraditional office spaces have become more common. Workplaces have emerged that differentiate themselves from the rest of the pack and embody the quirks and idiosyncrasies of their company founders. In other words, these workplaces are out to be cool. — By Daniel Bukszpan