The One World Trade Centre , at 546m , is the tallest building in the United States . Located in New York City , now an iconic part of its skyline , its construction cost was $ 4.01bn , according to Express . The New York Post named New York City the world ’ s most expensive construction market . Also known as the Freedom Tower , the One World Trade Centre was designed by architects Daniel Libeskind and David Childs in 2003 . It opened for business in 2014 , according to Mental Floss , after an 11-year construction period . The Wall Street Journal names it “ the world ’ s most expensive office tower ”. It is located in the 16-acre location previously inhabited by the Twin Towers , an area mostly owned by The Port Authority of New York and New Jersey .

52 February 2018