Sky City (Changsha)

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General information
Status Proposed
Type Mixed-use
Architectural style Supertall skyscraper
Location Changsha, Hunan, China
Coordinates 28°19′14″N 112°53′51″ECoordinates: 28°19′14″N 112°53′51″E
Estimated completion 2015
Cost ¥9 billion[1]
Owner Broad Sustainable Building
Management Broad Sustainable Building
Height
Architectural 838 m (2,749 ft)[2]
Roof 727 m (2,385 ft)
Technical details
Structural system Prefabricated modular
Floor count 220
6 below ground
Floor area 1,050,000 m2 (11,302,106 sq ft)
Lifts/elevators 104

If it is built as planned, Sky City would be the tallest building in the world, with 202 floors and a total height of 838 m (2,749 ft). However, its roof would not surpass that of the Burj Khalifa. The construction plan calls for it to be built from pre-fabricated units constructed on site in an unprecedentedly short period of 90 days.[9][10] BSB's plan is to assemble 95% of the building in its factory before any excavation takes place at the construction site.[15] The fabrication process is due to take around six months before the actual construction begins.[13][16]

According to the plan, the building's 202 stories will have a hotel accommodating 1000 guests, a hospital, 5 schools, and offices. Of the total space available, nearly 83% will be for residential purposes, housing up to 17,000 people. Another 5% will be for the hotel housing 1000, while 3% each will be dedicated to schools, hospitals, offices and shops. There will be 10 fire escape routes, which will evacuate a given floor within 15 minutes; the building will be fire-resistant for up to three hours. It will also have 17 helipads. Sport facilities will include six basketball courts and 10 tennis courts. Plans include preserving some green space around the building.

For transportation there will be 104 high-speed elevators installed. The safety of these potential elevators has been questioned because they take several minutes to get from bottom to top.[17] The 5000 residential properties will be able to accommodate 17,400 residents. The proposed building will have total floor space of 1.2 million m2 (13 million sq ft). The main building will have 1.05 million m2 (11 million sq ft) of this area, with a basement of 130,000 m2 (1,400,000 sq ft) and a 3 to 7 floor-high annex of 35,000 m2 (380,000 sq ft).[4] The total capacity of the building will be about 30,000.

The 4-layered glass used for the building's windows will keep the temperature of the building constant between 20 to 27 °C (68 to 81 °F). The air indoors will be specially filtered to be up to 20 times cleaner than the air outside. The lamps used in the building will be made of LEDs, saving energy. The builders have claimed to be working with some of the same architects who designed the Burj Khalifa, such as Adrian Smith.