<Table> <Tr> <Th_colspan="2"> One World Trade Center </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> One World Trade Center, the tallest skyscraper in the Western Hemisphere </Td> </Tr> <Tr> <Td_colspan="2"> Location within Lower Manhattan One World Trade Center (Manhattan) One World Trade Center (New York City) Show map of Lower Manhattan Show map of Manhattan Show map of New York City Show all </Td> </Tr> <Tr> <Th> Alternative names </Th> <Td> <Ul> <Li> 1 WTC </Li> <Li> Freedom Tower (pre-2009) </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Record height </Th> </Tr> <Tr> <Td_colspan="2"> Tallest in North America since 2013 </Td> </Tr> <Tr> <Th> Preceded by </Th> <Td> Willis Tower </Td> </Tr> <Tr> <Th_colspan="2"> General information </Th> </Tr> <Tr> <Th> Status </Th> <Td> Complete </Td> </Tr> <Tr> <Th> Type </Th> <Td> <Ul> <Li> Office </Li> <Li> Observation </Li> <Li> Communication </Li> </Ul> </Td> </Tr> <Tr> <Th> Architectural style </Th> <Td> Contemporary modern </Td> </Tr> <Tr> <Th> Location </Th> <Td> 285 Fulton Street Manhattan, New York City </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 40 ° 42 ′ 46.8" N 74 ° 0 ′ 48.6" W ﻿ / ﻿ 40.713000 ° N 74.013500 ° W ﻿ / 40.713000; - 74.013500 Coordinates: 40 ° 42 ′ 46.8" N 74 ° 0 ′ 48.6" W ﻿ / ﻿ 40.713000 ° N 74.013500 ° W ﻿ / 40.713000; - 74.013500 </Td> </Tr> <Tr> <Th> Construction started </Th> <Td> April 27, 2006 </Td> </Tr> <Tr> <Th> Topped - out </Th> <Td> May 10, 2013 </Td> </Tr> <Tr> <Th> Opened </Th> <Td> November 3, 2014 May 29, 2015 (One World Observatory) </Td> </Tr> <Tr> <Th> Cost </Th> <Td> US $3.9 billion </Td> </Tr> <Tr> <Th_colspan="2"> Height </Th> </Tr> <Tr> <Th> Architectural </Th> <Td> 1,776 ft (541.3 m) </Td> </Tr> <Tr> <Th> Tip </Th> <Td> 1,792 ft (546.2 m) </Td> </Tr> <Tr> <Th> Roof </Th> <Td> 1,368 ft (417.0 m) </Td> </Tr> <Tr> <Th> Top floor </Th> <Td> 1,268 ft (386.5 m) </Td> </Tr> <Tr> <Th> Observatory </Th> <Td> 1,254 ft (382.2 m) </Td> </Tr> <Tr> <Th_colspan="2"> Technical details </Th> </Tr> <Tr> <Th> Floor count </Th> <Td> 104 (+ 5 below ground floors) </Td> </Tr> <Tr> <Th> Floor area </Th> <Td> 3,501,274 sq ft (325,279 m) </Td> </Tr> <Tr> <Th> Lifts / elevators </Th> <Td> 73, made by ThyssenKrupp . </Td> </Tr> <Tr> <Th_colspan="2"> Design and construction </Th> </Tr> <Tr> <Th> Architect </Th> <Td> <Ul> <Li> David Childs </Li> <Li> Daniel Libeskind (2002) </Li> </Ul> </Td> </Tr> <Tr> <Th> Developer </Th> <Td> Port Authority of New York and New Jersey </Td> </Tr> <Tr> <Th> Structural engineer </Th> <Td> WSP Cantor Seinuk </Td> </Tr> <Tr> <Th> Other designers </Th> <Td> Hill International, The Louis Berger Group </Td> </Tr> <Tr> <Th> Main contractor </Th> <Td> Tishman Construction </Td> </Tr> <Tr> <Th_colspan="2"> References </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> <Dl> <Dd> a . April 2012 estimate . </Dd> <Dd> b . Skidmore, Owings & Merrill . </Dd> </Dl> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> One World Trade Center </Th> </Tr>

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