page_title: World Trade Center (2001–present)
section_title: Significant progress
hierarchical_section_title: World Trade Center (2001–present) / Rebuilding / Significant progress
caption_attribution_description: English: Construction of Three World Trade center as of April 2014. Portions of the South Pool (foreground), National September 11 Museum (left), and 4 World Trade Center (right) can also be seen.
context_page_description: The World Trade Center is a mostly completed complex of buildings in Lower Manhattan, New York City, U.S., replacing the original seven buildings on the same site that were destroyed in the September 11 attacks. The site is being rebuilt with up to six new skyscrapers, four of which have been completed; a memorial and museum to those killed in the attacks; the elevated Liberty Park adjacent to the site, containing the St. Nicholas Greek Orthodox Church and Vehicular Security Center; and a transportation hub. The 104-story One World Trade Center, the tallest building in the Western Hemisphere, is the lead building for the new complex.
  The buildings are among many created by the World Trade Centers Association. The original World Trade Center comprised the Twin Towers, which opened in 1973 and were the tallest buildings in the world at the time of their completion. They were destroyed on the morning of September 11, 2001, when al-Qaeda-affiliated hijackers flew two Boeing 767 jets into the complex in a coordinated act of terrorism. The attacks on the World Trade Center killed 2,753 people.
context_section_description: By August 2011, One World Trade Center was at 80 stories with glass up to the 54th floor, Tower Four was up around 38 stories with glass up to the 15th floor, and the former Deutsche Bank Building had been completely dismantled, and the Port Authority was working on their Vehicle Security Center. The memorial officially opened to relatives of the deceased on September 11, 2011, and to the general public on September 12. Construction on 5 WTC's foundation also began in September 2011. By December 2011, 2 WTC's foundations were finished and assembly of the frame was started. Because numerous American and Chinese companies were "very interested" in leasing space at the complex, 2 WTC was likely to be finished earlier than expected.
  In January 2012, with Silverstein still unable to find tenants for 4 WTC, construction on the above-ground levels was delayed indefinitely, with plans for only 7 stories. Meanwhile One World Trade Center topped out in August 2012, and its spire was then shipped from Quebec to New York, with the first section of the spire being hoisted to the top of the tower on December 12, 2012. The September 11 Museum was supposed to open that year. However, construction was halted in December 2011 to September 2012 due to cost disputes, and further delays were caused when Hurricane Sandy significantly damaged the site in November 2012.
  Several of the towers reached significant milestones in 2013: for instance, One WTC's spire was installed from January 15 to May 10, 2013. Construction of 2 WTC up to street level was completed in mid-2013, with work on the rest of the building delayed until tenants for 2 WTC could be found. Work also progressed on 3 WTC's below-grade foundations and the ground-level podium, which was completed by October 2013. 4 WTC, meanwhile, opened in November 2013, making it the second tower on the site to open behind 7 World Trade Center, as well as the first building on the Port Authority property. The first tenants to move into 4 WTC were two government agencies. The foundation of 5 WTC was also completed by November 2013, although construction on the main structure stalled because of a lack of tenants. In early December 2013, Australian retail corporation Westfield announced that it would invest US$800 million for complete control of the retail space at the rebuilt center, with subsidiary Westfield Corporation buying out the Port Authority's 50 percent stake in the retail part of the World Trade Center site. Liberty Park, a new elevated park, also began construction in late 2013 when the Vehicle Security Center was completed. The Port Authority allotted about $50 million to the park's construction in December 2013.
  The September 11 Museum opened to victims' families on April 15, 2014, and to the general public six days later. Temporary fences were removed around the memorial. At the same time, the September 11 Memorial discontinued the requirement for tickets in order to enter the memorial, not only providing pedestrian access to the future towers, but also a path through the site to the Memorial Plaza and surrounding streets. 3 WTC's construction resumed in August 2014, with projected completion by 2018. In September 2014, it was announced that the original plans for the Performing Arts Center had been canceled; construction had been slated to start in December 2014. The St. Nicholas Greek Orthodox Church's ground blessing ceremony and symbolic laying of the cornerstone took place at Liberty Park in October 2014, with construction expected to be completed within two years.  One WTC opened on November 3, 2014, and the first 170 employees of anchor tenant Conde Nast began their work there. In June 2015, the designers of 3 WTC scrapped plans for the rooftop spire in order to standardize the roofs with 2 and 4 WTC. The spire planned for 2 WTC was also canceled as part of a new plan for the tower.
  The World Trade Center Transportation Hub formally opened on March 3, 2016, several years behind schedule and billions of dollars over budget. Liberty Park opened on June 29, 2016, while Westfield
caption: Rebuilding progress in April 2014, looking east from the memorial
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