Grand Central Terminal Station 100th Anniversary, New York City, United States

Burying electric trains underground brought an additional advantage to the railroads: the ability to sell above-ground air rights over the tracks and platforms for real-estate development. With time, prestigious apartment and office buildings were erected around Grand Central, which turned the area into the most desirable commercial office district in Manhattan.
The terminal also did away with bifurcating Park Avenue by introducing a "circumferential elevated driveway" that allowed Park Avenue traffic to traverse around the building and over 42nd Street without encumbering nearby streets. The building was also designed to eventually reconnect both segments of 43rd Street by going through the concourse if the City of New York demanded it.
- Terminal City
The construction of Grand Central created a mini-city within New York, including the Commodore Hotel and various office buildings. It spurred construction throughout the neighborhood in the 1920s including the Chrysler Building.