New York City Transit (NYC Transit) is viewed as the world’s most expansive subway system due to its 468 subway stations, the most of any transit system in the world. It is also one of the world’s busiest subways, transporting 1.6 billion passengers annually. While the system emits 2 million tons of greenhouse gases each year, it prevents approximately 17 million tons of greenhouse gases annually, ‘making it one of the biggest sources of greenhouse gas avoidance in the United States.’

By far the bulk of the activity in the last eight years or so has happened in San Francisco. Facebook’s location on the Peninsula has been an outlier. The rest of the large companies are old Valley names like Intel, Cisco, Yahoo, and even wonkier names you wouldn’t recognize.

This shift to the North is precisely what’s caused the handwringing over whether we should embrace our inner Manhattan. As the city government works to keep companies like Salesforce and Twitter and Zynga in “the city” — for the first time in Valley history — no one knows where on earth the employees are going to live. We’re already north of 90 percent occupancy.

Meanwhile, take a look at those companies in the Peninsula and South Bay. They aren’t located in high-rises either. They are large, sprawling campuses with their own parks and gyms and car washes and convenience stores. They are in no way hubs of any budding urban ecosystem. They are self-contained, gated (via scannable badges) fiefdoms that have more in common with old coal mining towns of yore than the headquarters of say, Conde Nast or a Wall Street mega-bank.