One World Trade Centre, Lower Manhattan, New York City, New York, United States

Following the destruction of the original World Trade Center, there was debate regarding the future of the World Trade Center site. Proposals for its reconstruction began almost immediately, and by 2003, the Lower Manhattan Development Corporation organized a competition to determine how to use the site. Public rejection of the first round of designs, the "Preliminary Design Concepts", led to a second, more open competition in December 2002, in which a design by Daniel Libeskind was selected. This went through many revisions, largely because of disagreements with developer Larry Silverstein, who held the lease to the World Trade Center site on September 11, 2001.
Criticism was leveled at the limited number of floors that were designated for office space and other amenities in an early plan. Only 82 floors would have been habitable, and the overall office space of the entire rebuilt World Trade Center would have been reduced by more than 3,000,000 square feet (280,000 m2) in comparison with the original complex. The floor limit was imposed by Silverstein, who expressed concern that higher floors would be a liability in the event of a future terrorist attack or other incident. Much of the building's height would have consisted of a large, open-air steel lattice structure above the roof of the tower, containing wind turbines and "sky gardens". In a subsequent design, the highest space that could be occupied became comparable to the original World Trade Center, and the open-air lattice was removed from the plans. In 2002, former New York Governor George Pataki faced accusations of cronyism for supposedly using his influence to get the winning architect's bid picked as a personal favor for his friend and campaign contributor, Ron Lauder.
A final design for the "Freedom Tower" was formally unveiled on June 28, 2005. To satisfy security issues raised by the New York City Police Department, a 187-foot (57 m) concrete base was added in April of that year. The design originally included plans to clad the base in glass prisms to address criticism that it looked uninviting and resembled a "concrete bunker". However, this later proved unworkable, as preliminary testing revealed that the prismatic glass easily shattered into large and dangerous shards. As a result, it was replaced by a simpler facade consisting of stainless steel panels and blast-resistant glass.
Contrasting with Libeskind's original plan, the tower's final design tapers octagonally as it rises. Its designers stated that the tower would be a "monolithic glass structure reflecting the sky and topped by a sculpted antenna." Larry Silverstein commented in 2006 on a planned completion date: "By 2012 we should have a completely rebuilt World Trade Center, more magnificent, more spectacular than it ever was." On April 26, 2006, the Port Authority of New York and New Jersey approved a conceptual framework that enabled foundation construction to begin, and a formal agreement was drafted on the following day, the 75th anniversary of the 1931 opening of the Empire State Building. The tower's construction began in May with a formal ceremony that took place when the first construction team arrived. The building's topping out occurred on August 31, 2012, and was completed on May 2, 2013.