Sky lobby

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Galaxy Sky Lobby
The former World Trade Center's twin towers used sky lobbies, located on the 44th and 78th floors of each tower.

A sky lobby is an intermediate interchange floor where people can change from an express elevator that stops only at the sky lobby to a local elevator which stops at every floor within a segment of the building. When designing very tall (supertall) buildings supplying enough elevators is a problem – travellers wanting to reach a specific higher floor may conceivably have to stop at a very large number of other floors on the way up to let other passengers off and on. This increases travel time, and indirectly requires many more elevator shafts to still allow acceptable travel times – thus reducing effective floor space on each floor for all levels. (The other main technique to increase usage without adding more elevator shafts is double-deck elevators.)

Early uses of the sky lobby include the original Twin Towers of the World Trade Center and the John Hancock Center in Chicago.[1]

John Hancock Center[edit]

The John Hancock Center's sky lobby on the 44th floor serves only the residential portion of the building that occupies floors 45–92. Three express elevators run from the residential lobby on the ground floor to the 44th floor, with two of the elevators stopping at the parking garage's main level on floor 6. At floor 44, residents transfer to two banks of three elevators. One bank serves floors 45–65 and the other serves 65–92. Although all six elevators stop at floor 65, this floor is roughly the same layout as the residential floors immediately above and below it. It is not a sky lobby because residents can also board elevators to higher floors at floor 44.

The Hancock's 44th floor sky lobby includes a pool, gym, dry cleaner, convenience store, about 700 mailboxes, two "party" rooms, a sitting area overlooking Lake Michigan, a small library, a refuse room (with trash chutes emptying here), offices for the managers of the residential condominium,[2] and a polling station for residents during elections.

Floors above 92 are serviced by direct passenger elevators from the ground floor, by an emergency elevator from the ground floor, and by two freight elevators that run from floors 44 to 98.

Buildings with sky lobbies[edit]

The Central Plaza sky lobby
The Nina Tower sky lobby

(in chronological order by construction date)

References[edit]

  1. ^ "Otis History: The World Trade Center". Otis Elevator Company. Archived from the original on 2006-11-15. Retrieved 2006-12-07. 
  2. ^ "The John Hancock Center". Earl Reid. Retrieved 2008-01-07. 
  3. ^ "Adrian Smith interview". WTTW. August 4, 2011. Retrieved 2011-08-07. 
  4. ^ "Six Star Hotel - Australia 108". Retrieved 2013-03-19. 
  5. ^ "Rising high: 108-storey super tower planned for Melbourne". The West Australian. 2012-11-12. Retrieved 2013-03-19.