the observation deck opened. The concourse cost $225 million to build, and has been described as the most expensive passageway in the world. Construction Construction of the Oculus called for relocation of the World Trade Center cross in April 2006. However, the Oculus's construction did not begin in earnest until July 8, 2008, when the first prefabricated "ribs" for the pedestrian walkway under Fulton Street were installed on the site. The mezzanine level of the station was undergoing major construction and work on the foundation was underway. By March 2011, over 225 of the 300 steel pieces that make up the roof of the station were installed. Later that month installation of the Vierendeel Truss, one of the hub's key components, began with the installation of a section of the truss. The truss serves as the mezzanine roof and also acts as a support for the northeast corner of the WTC Memorial. The Oculus's $542 million construction contract was awarded to Skanska in summer 2010. The project included steel erection for the substructure; construction connecting to the Vehicular Security Center; the Greenwich Street corridor and the steel and concrete placing under the subway box; and preparations for installation of east arch truss. By June 2013, ten pieces of exterior arches were installed for the Oculus. The initial construction was expected to conclude at the end of 2014 or beginning of 2015, and the internal construction such as paint, turnstiles, and ticket booths, was expected to complete in the end of 2015, with an official opening scheduled for December 17, 2015. On October 23, 2013, the West Concourse opened with access to the World Financial Center, now renamed the Brookfield Place. The storefronts were covered and not yet opened, and the second floor was still closed for construction of One World Trade Center. On February 25, 2014, half of the first platform of the new station, Platform A, was opened to the public with service to Hoboken. The new platform, an island platform, was fully modernized and contains new lighting, speakers, illuminated signs, escalators and elevators. The west side of the platform was walled off at the time. On November 3, One World Trade Center opened, as did the PATH entrance from that building. Eight days later, the Fulton Center and Dey Street Concourse opened to the public. The Dey Street Concourse entrance into the Transportation Hub was closed until the