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 floor where people can change from an express elevator that only stops 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. The sky lobby, first used in the John Hancock Center in Chicago,^[1] is one approach to the problem, because travellers to specific floors do not tie up the main elevator due to getting on and off, increasing the efficiency of the 'long-distance' elevators, and reducing the number of elevator shafts at a given point. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... This article is about the former World Trade Center (Twin Towers) in New York City. ... It has been suggested that this article or section be merged with Elevator surfing. ... Unbuilt supertall skyscraper, The Illinois Supertall is a term that refers to a skyscraper exceeding 1000 feet or 300 meters. ... Several buildings bear this name, all built by John Hancock Insurance and named after John Hancock. ... Flag Seal Nickname: The Windy City Motto: Urbs In Horto (Latin: City in a Garden), I Will Location Location in Chicagoland and northern Illinois Coordinates , Government Country State Counties United States Illinois Cook, DuPage Mayor Richard M. Daley (D) Geographical characteristics Area     City 606. ...

Buildings with sky lobbies

(in chronological order by construction date)

• John Hancock Center in Chicago
• 1 World Trade Center (Two sky lobbies at 44th and 78th floors) in New York City
• 2 World Trade Center (Two sky lobbies at 44th and 78th floors) in New York City
• Sears Tower (Two double level sky lobbies at 33rd/34th and 66th/67th floors) in Chicago
• Columbia Center (Sky lobby at 40th floor) in Seattle, Washington, USA
• Izumi Garden Tower in Tokyo, Japan
• Petronas Twin Towers in Kuala Lumpur, Malaysia located at level 47/48
• Taipei 101 (Two double level sky lobbies at 35th/36th and 59th/60th floors) in Taipei, Taiwan, ROC

Several buildings bear this name, all built by John Hancock Insurance and named after John Hancock. ... Flag Seal Nickname: The Windy City Motto: Urbs In Horto (Latin: City in a Garden), I Will Location Location in Chicagoland and northern Illinois Coordinates , Government Country State Counties United States Illinois Cook, DuPage Mayor Richard M. Daley (D) Geographical characteristics Area     City 606. ... This article is about the former World Trade Center (Twin Towers) in New York City. ... New York, New York and NYC redirect here. ... This article is about the former World Trade Center (Twin Towers) in New York City. ... New York, New York and NYC redirect here. ... This article does not cite any references or sources. ... Flag Seal Nickname: The Windy City Motto: Urbs In Horto (Latin: City in a Garden), I Will Location Location in Chicagoland and northern Illinois Coordinates , Government Country State Counties United States Illinois Cook, DuPage Mayor Richard M. Daley (D) Geographical characteristics Area     City 606. ... The Columbia Center (formerly the Bank of America Tower, Columbia Center and the Columbia Seafirst Center) is the tallest skyscraper in the downtown Seattle skyline. ... City nickname Emerald City City bird Great Blue Heron City flower Dahlia City mottos The City of Flowers The City of Goodwill City song Seattle, the Peerless City Mayor Greg Nickels County King County Area   - Total   - Land   - Water   - % water 369. ... Official language(s) English Capital Olympia Largest city Seattle Area  Ranked 18th  - Total 71,342 sq mi (184,827 km²)  - Width 240 miles (385 km)  - Length 360 miles (580 km)  - % water 6. ... The Izumi Garden Tower is a 216 m high-rise building in the Roppongi district of Tokyo. ...   , literally Eastern capital) is a unique subnational administrative region of Japan with characteristics of both a prefecture and a city. ... The Petronas Twin Towers (also known as the Petronas Towers), in Kuala Lumpur, Malaysia, were once the worlds tallest buildings when measured from the level of the main entrance to the structural or architectural top. ... This article does not cite any references or sources. ... Taipei 101 (Traditional Chinese: ; Simplified Chinese: ; Hanyu Pinyin: TáibÄ›i YÄ«língyÄ«; Wade-Giles: Tai-pei I-ling-i) is a 101-floor landmark skyscraper located in Taipei City, Taiwan, Republic of China. ... For other uses, see Taipei (disambiguation). ... Motto none Anthem National Anthem of the Republic of China Capital Taipei (formerly and de jure Nanking) Largest city Taipei Official languages Standard Mandarin (GuóyÇ”) Government Semi-presidential system  -  President Chen Shui-bian  -  Vice President Annette Lu  -  Premier Chang Chun-hsiung Establishment Xinhai Revolution   -  Independence declared October 10, 1911...

References

1. ^ Otis History: The World Trade Center. Otis Elevator Company. Retrieved on 2006-12-07.