The original plan incorporated a sort of “gangplank” system into the design, allowing passengers to disembark to a platform on the 102nd floor.  It proved to be unworkable due to the fact that not many people would be willing to walk a narrow plank suspended over 1,200 feet above the street in high winds.  

In the book that I referenced, there’s an artist’s rendering called "King's Dream of New York" illustrating the plan they envisioned for the “city of the future”.  It shows dirigibles flying low over the city, as well as a series of pedestrian bridges connecting the buildings to one another high above street level. 

Regards,
Scott Perry