In 2011, after decades in which Silicon Valley had seemed to care no more about its surroundings than about its clothes, Steve Jobs announced he had hired Sir Norman Foster to design a vast new Apple headquarters. Facebook soon commissioned an equally massive building from Frank Gehry. Google followed suit, along with Amazon, up north. As the tech industry finally turns its attention to architecture, Paul Goldberger explores what companies’ choices reveal about their cultures, their workforces, and the shifting relationship between city and suburbs.