As urban land grows ever scarcer and more expensive, planners are increasingly turning their eyes skyward to the unused space overhead. And when they survey the city, the airspace that stands out most is that over open railroad tracks and highways.
A start has already been made toward tapping this new urban dimension. In Boston, the Prudential Center is built on top of the Massachusetts Turnpike. In Manhattan, four high-rise apartment buildings have straddled the approaches to the George Washington Bridge since 1963. Chicago's 41-story Prudential Building rose over the Illinois Central...
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