The decline of places like Windy Ridge and Franklin Reserve is usually attributed to the subprime-mortgage crisis, with its wave of foreclosures. And the crisis has indeed catalyzed or intensified social problems in many communities. But the story of vacant suburban homes and declining suburban neighborhoods did not begin with the crisis, and will not end with it. A structural change is under way in the housing market—a major shift in the way many Americans want to live and work. It has shaped the current downturn, steering some of the worst problems away from the cities and toward the suburban fringes. And its effects will be felt more strongly, and more broadly, as the years pass. Its ultimate impact on the suburbs, and the cities, will be profound.