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Construction of the One World Trade Center in New York began in 2006 and was completed in 2014 . The result was a 541 metrehigh office structure made out of reinforced concrete and steel . The building was designed by Skidmore , Owings & Merrill LLP , and has 99 floors : 5 below ground and 94 above . The project cost US $ 3.9bn to complete .

Also designed by Kohn Pedersen Fox Associates is the Lotte World Tower in Seoul , which is 554m high . The design of the building takes inspiration from traditional Korean art forms . It has 129 floors , six of which are below ground , and was constructed using reinforced concrete and steel . It took six years to complete , with construction coming to an end in 2017 and building costs amassing US $ 2.5bn . It is 554.5m in height .

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