[TulliusCicero]

* You also have to factor in that people with suburban preferences are going to be less likely to be willing to move. It's a less accessible demographic.

* The nature of "suburbs" is that they don't scale well. They're not meant to, suburbs are supposed to be the thing on the outside, not the thing everyone comes to. And while costs may be lower in some ways, they may be higher in others: like how Google has to run its own fleet of shuttles to go to Mountain View, because transit is inadequate. They don't do that in NYC.

* Google has a cultural preference for being environmentally friendly. Suburban style living and working is more energy intensive and less environmentally friendly than its urban counterpart.

* There's a large contingent of people that are united in their support for companies like Google to open an office in a more suburban city, somewhere, but I suspect that if you actually tried to pick a particular city, suddenly that support would fracture into a million pieces.