<P> The building opened on November 3, 2014, and Condé Nast employees moved into spaces spread among 24 floors . Condé Nast occupied floors 20 to 44, having completed its move in early 2015 . It was expected that the company would attract new tenants to occupy the remaining 40% of unleased space in the tower, as Condé Nast had revitalized Times Square after moving there in 1999 . Only about 170 of 3,400 total employees moved into the new tower on the first day . At the time, future tenants included Kids Creative, Legends Hospitality, the BMB Group, Servcorp, and GQ . </P> <P> On November 12, 2014, the supporting wire rope cables of a suspended working platform slacked . The cables were manufactured by Tractel, and they were used to hold workers who performed maintenance on the building's exterior . At the time, the platform was holding a two - man, SEIU - affiliated window washing team . The slack caused the platform to hang almost vertically near the 68th floor of the tower . The workers were rescued by over 100 FDNY firefighters, who used a diamond saw to cut through the glass . After the incident, the workers suffered from a slight case of hypothermia, and were taken to the hospital . </P> <P> An estimate in February 2007 placed the initial construction cost of One World Trade Center at about $3 billion, or $1,150 per square foot ($12,380 per square meter). However, the tower's total estimated construction cost had risen to $3.9 billion by April 2012, making it the most expensive building in the world at the time . The tower's construction was partly funded by approximately $1 billion of insurance money that Silverstein received for his losses in the September 11 attacks . The State of New York provided an additional $250 million, and the Port Authority agreed to give $1 billion, which would be obtained through the sale of bonds . The Port Authority raised prices for bridge and tunnel tolls to raise funds, with a 56 percent toll increase scheduled between 2011 and 2015; however, the proceeds of these increases were not used to pay for the tower's construction . </P> <P> Many of Daniel Libeskind's original concepts from the 2002 competition were discarded from the tower's final design . One World Trade Center's final design consisted of simple symmetries and a more traditional profile, intended to compare with selected elements of the contemporary New York skyline . The tower's central spire draws from previous buildings, such as the Empire State Building and the Chrysler Building . It also visually resembles the original Twin Towers, rather than being an off - center spire similar to the Statue of Liberty . One World Trade Center is considered the first major building whose construction is based upon a three - dimensional Building Information Model . </P>

Who paid for the one world trade center