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This is an old revision of this page, as edited by JurgenNL (talk | contribs) at 12:42, 19 June 2014 ((Script) File renamed: File:World Trade Center Building Design with Floor and Elevator Arrangment.svg → File:World Trade Center Building Design with Floor and Elevator Arrangement.svg [[commons:COM:FR#reasons|File renaming...). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

For other World Trade Centers, see List of world trade centers. For other uses, see World Trade Center (disambiguation).

World Trade Center[1]
The original World Trade Center of New York City in March 2001. The North Tower (left), with antenna spire, is 1 WTC. The South Tower (right) is 2 WTC. All seven buildings of the WTC complex are partially visible (see map below). The red granite-clad building left of the Twin Towers is the original 7 World Trade Center. In the background is the East River.
Record height
Tallest in the world from 1971 to 1973[I]
Preceded byEmpire State Building
Surpassed byWillis Tower
General information
StatusDestroyed
LocationNew York City
GroundbreakingAugust 25, 1966
Construction started
  • 1 WTC: August 1968
  • 2 WTC: January 1969
  • 3 WTC: December 1979
  • 4, 5, and 6 WTC: 1970
  • 7 WTC: 1983
Completed
  • 1 WTC: December 23, 1970
  • 2 WTC: July 19, 1971
  • 3 WTC: July 1981
  • 4, 5, and 6 WTC: 1975
  • 7 WTC: May 1987[2]
OpeningApril 4, 1973
DestroyedSeptember 11, 2001
OwnerPort Authority of New York and New Jersey
Height
Antenna spire1 WTC: 1,727 ft (526.3 m)
Roof
  • 1 WTC: 1,368 ft (417.0 m)
  • 2 WTC: 1,362 ft (415.0 m)
  • 3 WTC: 242 ft (74.0 m)
  • 4 and 5 WTC: 118 ft (36.0 m)
  • 6 WTC: 105 ft (32.0 m)
  • 7 WTC: 610 ft (186.0 m)
Top floor
  • 1 WTC: 1,347 ft (411.0 m)
  • 2 WTC: 1,341 ft (409.0 m)
Technical details
Floor count
  • 1 and 2 WTC: 110 floors
  • 3 WTC: 22 floors
  • 4 and 5 WTC: 9 floors
  • 6 WTC: 8 floors
  • 7 WTC: 47 floors
Floor area
  • 1 and 2 WTC: 4,300,000 sq ft (400,000 m2) each
  • 4, 5, and 6 WTC: 500,000 sq ft (50,000 m2) each
  • 7 WTC: 1,868,000 sq ft (170,000 m2)
Lifts/elevators1 and 2 WTC: 99 each
Design and construction
Architect(s)
EngineerWorthington, Skilling, Helle & Jackson,[3] Leslie E. Robertson Associates

The World Trade Center is a complex of buildings under construction in Lower Manhattan, New York City, United States, replacing an earlier complex of seven buildings with the same name on the same site. The original World Trade Center featured landmark twin towers, which opened on April 4, 1973, and were destroyed in the September 11 attacks of 2001, along with 7 World Trade Center. The other buildings in the complex were severely damaged by the collapse of the twin towers, and their ruins were eventually demolished. The site is being rebuilt with six new skyscrapers, a memorial to those killed in the attacks, and a transportation hub. One World Trade Center will be the lead building for the new complex, reaching more than 100 stories at its completion.[4] It will be the tallest building in the United States when complete.

At the time of their completion the "Twin Towers", the original 1 World Trade Center (the North Tower), at 1,368 feet (417 m), and 2 World Trade Center (the South Tower), were the tallest buildings in the world. The other buildings in the complex included the Marriott World Trade Center (3 WTC), 4 WTC, 5 WTC, 6 WTC, and 7 WTC. All of these buildings were built between 1975 and 1985, with a construction cost of $400 million ($Error when using {{Inflation}}: |end_year=2,024 (parameter 4) is greater than the latest available year (2,023) in index "US". in 2024 dollars).[5] The complex was located in New York City's Financial District and contained 13,400,000 square feet (1,240,000 m2) of office space.[6][7]

The World Trade Center experienced a fire on February 13, 1975, a bombing on February 26, 1993 and a robbery on January 14, 1998. In 1998, the Port Authority decided to privatize the World Trade Center, leasing the buildings to a private company to manage, and awarded the lease to Silverstein Properties in July 2001.

On the morning of September 11, 2001, Al-Qaeda-affiliated hijackers flew two Boeing 767 jets into the complex, one into each tower, in a coordinated act of terrorism. After burning for 56 minutes, the South Tower (2) collapsed, followed a half-hour later by the North Tower (1). The attacks on the World Trade Center killed 2,753 people.[8] Falling debris from the towers, combined with fires that the debris initiated in several surrounding buildings, led to the partial or complete collapse of all the other buildings in the complex and caused catastrophic damage to ten other large structures in the surrounding area (including the World Financial Center). The process of cleaning up and recovery at the World Trade Center site took eight months.

Over the following years, plans were created for the reconstruction of the World Trade Center. The Lower Manhattan Development Corporation (LMDC), established in November 2001 to oversee the rebuilding process, organized competitions to select a site plan and memorial design. Memory Foundations, designed by Daniel Libeskind, was selected as the master plan; however, substantial changes were made to the design.

The first new building at the site was the 7 World Trade Center, which opened in May 2006. The memorial section of the National September 11 Memorial & Museum opened on September 11, 2011 and the museum opened in May 2014. Construction of the One World Trade Center is nearing completion and it is expected to open in 2014; the 4 World Trade Center opened on November 13, 2013; the 3 World Trade Center is under construction and expected to open in 2016; as of November 2013, according to an agreement made with Silverstein Properties Inc., the 2 World Trade Center will not be built to its full height until sufficient leasing is established to make the building financially viable;[9] and 5 World Trade Center will be developed by the Port Authority of New York and New Jersey, but, as of February 2014, a schedule was not confirmed.[10]

Original buildings

Planning and construction

Main article: Construction of the World Trade Center

The idea of establishing a World Trade Center in New York City was first proposed in 1943. The New York State Legislature passed a bill authorizing New York Governor Thomas E. Dewey to begin developing plans for the project[11] but the plans were put on hold in 1949.[12] During the late 1940s and 1950s, economic growth in New York City was concentrated in Midtown Manhattan. To help stimulate urban renewal in Lower Manhattan, David Rockefeller suggested that the Port Authority build a World Trade Center in Lower Manhattan.[13]

Initial plans, made public in 1961, identified a site along the East River for the World Trade Center.[14] As a bi-state agency, the Port Authority required approval for new projects from the governors of both New York and New Jersey. New Jersey Governor Robert B. Meyner objected to New York getting a $335 million project.[15] Toward the end of 1961, negotiations with outgoing New Jersey Governor Meyner reached a stalemate.[16]

At the time, ridership on New Jersey's Hudson and Manhattan Railroad (H&M) had declined substantially from a high of 113 million riders in 1927 to 26 million in 1958 after new automobile tunnels and bridges had opened across the Hudson River.[17] In a December 1961 meeting between Port Authority director Austin J. Tobin and newly elected New Jersey Governor Richard J. Hughes, the Port Authority offered to take over the Hudson & Manhattan Railroad to have it become the Port Authority Trans-Hudson (PATH). The Port Authority also decided to move the World Trade Center project to the Hudson Terminal building site on the west side of Lower Manhattan, a more convenient location for New Jersey commuters arriving via PATH.[16] With the new location and Port Authority acquisition of the H&M Railroad, New Jersey agreed to support the World Trade Center project.[18]

Approval was also needed from New York City Mayor John Lindsay and the New York City Council. Disagreements with the city centered on tax issues. On August 3, 1966, an agreement was reached that the Port Authority would make annual payments to the City in lieu of taxes for the portion of the World Trade Center leased to private tenants.[19] In subsequent years, the payments would rise as the real estate tax rate increased.[20]

Architectural design

On September 20, 1962, the Port Authority announced the selection of Minoru Yamasaki as lead architect and Emery Roth & Sons as associate architects.[21] Yamasaki devised the plan to incorporate twin towers; Yamasaki's original plan called for the towers to be 80 stories tall,[22] but to meet the Port Authority's requirement for 10,000,000 square feet (930,000 m2) of office space, the buildings would each have to be 110 stories tall.[23]

A typical floor layout and elevator arrangement of the WTC towers.

A major limiting factor in building height is the issue of elevators; the taller the building, the more elevators are needed to service the building, requiring more space-consuming elevator banks.[23] Yamasaki and the engineers decided to use a new system with two "sky lobbies"—floors where people could switch from a large-capacity express elevator to a local elevator that goes to each floor in a section. This system, inspired by the New York City Subway system,[24] allowed the design to stack local elevators within the same elevator shaft. Located on the 44th and 78th floors of each tower, the sky lobbies enabled the elevators to be used efficiently, increasing the amount of usable space on each floor from 62 to 75 percent by reducing the number of elevator shafts.[25][26] Altogether, the World Trade Center had 95 express and local elevators.[27]

Yamasaki's design for the World Trade Center, unveiled to the public on January 18, 1964, called for a square plan approximately 208 feet (63 m) in dimension on each side.[22][28] The buildings were designed with narrow office windows 18 inches (46 cm) wide, which reflected Yamasaki's fear of heights as well as his desire to make building occupants feel secure.[29] Yamasaki's design included building facades sheathed in aluminum-alloy.[30] The World Trade Center was one of the most-striking American implementations of the architectural ethic of Le Corbusier, and it was the seminal expression of Yamasaki's gothic modernist tendencies.[31]

In addition to the twin towers, the plan for the World Trade Center complex included four other low-rise buildings, which were built in the early 1970s. The 47-story 7 World Trade Center building was added in the 1980s, to the north of the main complex. Altogether, the main World Trade Center complex occupied a 16-acre (65,000 m2) superblock.[32]

Structural design

The World Financial Center and Battery Park City were built on reclaimed land.

The structural engineering firm Worthington, Skilling, Helle & Jackson worked to implement Yamasaki's design, developing the tube-frame structural system used in the twin towers. The Port Authority's Engineering Department served as foundation engineers, Joseph R. Loring & Associates as electrical engineers, and Jaros, Baum & Bolles as mechanical engineers. Tishman Realty & Construction Company was the general contractor on the World Trade Center project. Guy F. Tozzoli, director of the World Trade Department at the Port Authority, and Rino M. Monti, the Port Authority's Chief Engineer, oversaw the project.[33] As an interstate agency, the Port Authority was not subject to local laws and regulations of the City of New York, including building codes. Nonetheless, the structural engineers of the World Trade Center ended up following draft versions of the new 1968 building codes.[34] The tube-frame design, earlier introduced by Fazlur Khan, was a new approach that allowed more open floor plans than the traditional design that distributed columns throughout the interior to support building loads. The World Trade Center towers used high-strength, load-bearing perimeter steel columns called Vierendeel trusses that were spaced closely together to form a strong, rigid wall structure, supporting virtually all lateral loads such as wind loads, and sharing the gravity load with the core columns. The perimeter structure containing 59 columns per side was constructed with extensive use of prefabricated modular pieces, each consisting of three columns, three stories tall, connected by spandrel plates.[34] The spandrel plates were welded to the columns to create the modular pieces off-site at the fabrication shop.[35] Adjacent modules were bolted together with the splices occurring at mid-span of the columns and spandrels. The spandrel plates were located at each floor, transmitting shear stress between columns, allowing them to work together in resisting lateral loads. The joints between modules were staggered vertically, so that the column splices between adjacent modules were not at the same floor.[34]

The core of the towers housed the elevator and utility shafts, restrooms, three stairwells, and other support spaces. The core of each tower was a rectangular area 87 by 135 feet (27 by 41 m) and contained 47 steel columns running from the bedrock to the top of the tower. The large, column-free space between the perimeter and core was bridged by prefabricated floor trusses. The floors supported their own weight as well as live loads, providing lateral stability to the exterior walls and distributing wind loads among the exterior walls.[36] The floors consisted of 4 inches (10 cm) thick lightweight concrete slabs laid on a fluted steel deck. A grid of lightweight bridging trusses and main trusses supported the floors.[37] The trusses connected to the perimeter at alternate columns and were on 6 foot 8 inch (2.03 m) centers. The top chords of the trusses were bolted to seats welded to the spandrels on the exterior side and a channel welded to the core columns on the interior side. The floors were connected to the perimeter spandrel plates with viscoelastic dampers that helped reduce the amount of sway felt by building occupants.

Hat trusses (or "outrigger truss") located from the 107th floor to the top of the buildings were designed to support a tall communication antenna on top of each building.[37] Only 1 WTC (north tower) actually had an antenna fitted; it was added in 1978.[38] The truss system consisted of six trusses along the long axis of the core and four along the short axis. This truss system allowed some load redistribution between the perimeter and core columns and supported the transmission tower.[37]

The tube frame design, using steel core and perimeter columns protected with sprayed-on fire resistant material, created a relatively lightweight structure that would sway more in response to the wind compared to traditional structures, such as the Empire State Building that have thick, heavy masonry for fireproofing of steel structural elements.[39] During the design process, wind tunnel tests were done to establish design wind pressures that the World Trade Center towers could be subjected to and structural response to those forces.[40] Experiments also were done to evaluate how much sway occupants could comfortably tolerate; however, many subjects experienced dizziness and other ill effects.[41] One of the chief engineers Leslie Robertson worked with Canadian engineer Alan G. Davenport to develop viscoelastic dampers to absorb some of the sway. These viscoelastic dampers, used throughout the structures at the joints between floor trusses and perimeter columns along with some other structural modifications, reduced the building sway to an acceptable level.[42]

Construction

This portion of Cortlandt Street (shown in 1936) was acquired and demolished.

In March 1965, the Port Authority began acquiring property at the World Trade Center site.[43] Demolition work began on March 21, 1966, to clear thirteen square blocks of low rise buildings in Radio Row for construction of the World Trade Center.[44] Groundbreaking for the construction of the World Trade Center took place on August 5, 1966.[45]

The site of the World Trade Center was located on landfill with the bedrock located 65 feet (20 m) below.[46] To construct the World Trade Center, it was necessary to build a "bathtub" with a slurry wall around the West Street side of the site, to keep water from the Hudson River out.[47] The slurry method selected by Port Authority's chief engineer, John M. Kyle, Jr., involved digging a trench, and as excavation proceeded, filling the space with a "slurry" mixture composed of bentonite and water, which plugged holes and kept groundwater out. When the trench was dug out, a steel cage was inserted and concrete was poured in, forcing the "slurry" out. It took fourteen months for the slurry wall to be completed. It was necessary before excavation of material from the interior of the site could begin.[48] The 1,200,000 cubic yards (920,000 m3) of material excavated were used (along with other fill and dredge material) to expand the Manhattan shoreline across West Street to form Battery Park City.[49][50]

Construction underway in late 1969
World Trade Center under construction in 1971
The World Trade Center from the then newly completed West Side Highway in July 2001.

In January 1967, the Port Authority awarded $74 million in contracts to various steel suppliers, and Karl Koch was hired to erect the steel.[51] Tishman Realty & Construction was hired in February 1967 to oversee construction of the project.[52] Construction work began on the North Tower in August 1968; construction on the South Tower was underway by January 1969.[53] The original Hudson Tubes, carrying PATH trains into Hudson Terminal, remained in service as elevated tunnels during the construction process until 1971 when a new PATH station opened.[54]

The topping out ceremony of 1 WTC (North Tower) took place on December 23, 1970, while 2 WTC's ceremony (South Tower) occurred later on July 19, 1971.[53] The first tenants moved into the North Tower in December 1970; the South Tower accepted tenants in January 1972.[55] When the World Trade Center twin towers were completed, the total costs to the Port Authority had reached $900 million.[56] The ribbon cutting ceremony was on April 4, 1973.[57]

Criticism

Plans to build the World Trade Center were controversial. The site for the World Trade Center was the location of Radio Row, home to hundreds of commercial and industrial tenants, property owners, small businesses, and approximately 100 residents, many of whom fiercely resisted forced relocation.[58] A group of small businesses affected filed an injunction challenging the Port Authority's power of eminent domain.[59] The case made its way through the court system to the United States Supreme Court; the Court refused to accept the case.[60]

Private real estate developers and members of the Real Estate Board of New York, led by Empire State Building owner Lawrence A. Wien, expressed concerns about this much "subsidized" office space going on the open market, competing with the private sector when there was already a glut of vacancies.[61][62] The World Trade Center itself was not rented out completely until after 1979 and then only due to the fact that the complex's subsidy by the Port Authority made rents charged for its office space relatively cheaper then that of comparable office space in other buildings.[63] Others questioned whether the Port Authority should have taken on a project described by some as a "mistaken social priority".[64]

The World Trade Center design brought criticism of its aesthetics from the American Institute of Architects and other groups.[30][65] Lewis Mumford, author of The City in History and other works on urban planning, criticized the project and described it and other new skyscrapers as "just glass-and-metal filing cabinets".[66] The twin towers' narrow office windows, only 18 inches (46 cm) wide and framed by pillars that restricted views on each side to narrow slots, were disliked by many.[29] Activist and sociologist Jane Jacobs also criticized plans for the WTC's construction, arguing that the waterfront should be kept open for New Yorkers to enjoy.[67]

The trade center's "superblock", replacing a more traditional, dense neighborhood, was regarded by some critics as an inhospitable environment that disrupted the complicated traffic network typical of Manhattan. For example, in his book The Pentagon of Power, Lewis Mumford denounced the center as an "example of the purposeless giantism and technological exhibitionism that are now eviscerating the living tissue of every great city".[68]

For many years, the immense Austin J. Tobin Plaza was often beset by brisk winds at ground level owing to the venturi effect between the two towers.[69] In fact, some gusts were so high that pedestrian travel had to be aided by ropes.[70] In 1999, the outdoor plaza reopened after undergoing $12 million renovations, which involved replacing marble pavers with gray and pink granite stones, adding new benches, planters, new restaurants, food kiosks and outdoor dining areas.[71]

Complex

North and South Towers

Main articles: One World Trade Center and Two World Trade Center
The WTC site building arrangement

Top of the World observation deck

Two World Trade Center's observation deck received an estimated 80,000 visitors a day.[72]

Although most of the space in the World Trade Center complex was off-limits to the public, the South Tower featured an indoor and outdoor public observation area called Top of the World Trade Center Observatories on its 107th and 110th floors. Visitors would pass through security checks added after the 1993 World Trade Center bombing,[73] then were whisked to the 107th floor indoor observatory at a height of 1,310 feet (400 m). The columns on each face of the building were narrowed on this level to allow 28 inches of glass between them. The Port Authority renovated the observatory in 1995, then leased it to Ogden Entertainment to operate. Attractions added to the observation deck included a simulated helicopter ride around the city. The 107th floor food court was designed with a subway car theme and featured Sbarro and Nathan's Famous Hot Dogs.[74][75] Weather permitting, visitors could take two short escalator rides up from the 107th floor viewing area to an outdoor viewing platform on the 110th floor at a height of 1,377 ft (420 m).[76] On a clear day, visitors could see up to 50 miles (80 km).[74] An anti-suicide fence was placed on the roof itself, with the viewing platform set back and elevated above it, requiring only an ordinary railing and leaving the view unobstructed, unlike the observation deck of the Empire State Building.[75]

Windows on the World restaurant

Main article: Windows on the World

The North Tower had a restaurant on its 106th and 107th floors called Windows on the World, which opened in April 1976. The restaurant was developed by Joe Baum at a cost of more than $17 million.[77] Aside from the main restaurant, two offshoots were located at the top of the North Tower: "Hors d'Oeuvrerie" (offered a Danish smorgasbord during the day and sushi in the evening) and "Cellar in the Sky" (a small wine bar).[78] Windows on the World also had a wine school program run by Kevin Zraly. Windows on the World was closed following the 1993 World Trade Center bombing.[77] Upon reopening in 1996, Hors d'Oeuvrerie and Cellar in the Sky were replaced with the "Greatest Bar on Earth" and "Wild Blue".[78] In 2000, its last full year of operation, Windows on the World reported revenues of $37 million, making it the highest-grossing restaurant in the United States.[79] The Skydive Restaurant, opened in 1976 on the 44th floor of the North Tower, was also operated by Windows on the World restaurant, but served only lunch.

Other buildings

Five smaller buildings stood around the 16 acres (65,000 m2) block. One was the 22-floor hotel, which opened in 1981 as the Vista Hotel, and in 1995 became the Marriott World Trade Center (3 WTC) at the southwest corner of the site. Three low-rise buildings (4 WTC, 5 WTC, and 6 WTC) in the same hollow tube design as the towers also stood around the plaza. 6 World Trade Center, at the northwest corner, housed the United States Customs Service and the U.S. Commodities Exchange. 5 World Trade Center was located at the northeast corner above the PATH station and 4 World Trade Center was at the southeast corner. In 1987, a 47-floor office building called 7 World Trade Center was built north of the block. Beneath the World Trade Center complex was an underground shopping mall, which in turn had connections to various mass transit facilities including the New York City Subway system and the Port Authority's own PATH trains connecting Manhattan to Jersey City, Hoboken, and Newark.[citation needed]

One of the world's largest gold depositories was stored underneath the World Trade Center, owned by a group of commercial banks. The 1993 bombing detonated close by the vault held.[clarification needed] Seven weeks after the September 11 attacks, $230 million in precious metals was removed from basement vaults of 4 WTC, which included 3,800 100-Troy-ounce 24 carat gold bars and 30,000 1,000-ounce silver bars.[80]

Life and events

Twin Towers at night seen from the Empire State Building in May 2001.

On a typical weekday 50,000 people worked in the towers[81] with another 200,000 passing through as visitors.[82] The complex was so large that it had its own zip code: 10048.[83] The towers offered expansive views from the observation deck atop the South Tower and the Windows on the World restaurant on top of the North Tower. The Twin Towers became known worldwide, appearing in numerous movies and television shows as well as on postcards and other merchandise, and became seen as a New York icon, in the same league as the Empire State Building, Chrysler Building and the Statue of Liberty.[84]

French high wire acrobatic performer Philippe Petit walked between the towers on a tightrope in 1974, as shown in the documentary film Man on Wire.[85] Petit walked between the towers eight times on a steel cable that was laid out using a bow and arrow.[86]

Brooklyn toymaker George Willig scaled the exterior of the south tower in 1977.[87] In 1983, on Memorial Day, high-rise firefighting and rescue advocate Dan Goodwin successfully climbed the outside of the WTC's North Tower. His stunt was meant to call attention to the inability to rescue people potentially trapped in the upper floors of skyscrapers.[88][89]

The 1995 PCA world chess championship was played on the 107th floor of the South Tower.[90]

February 13, 1975 fire

On February 13, 1975, a three-alarm fire broke out on the 11th floor of the North Tower. Fire spread through the tower to the 9th and 14th floors by igniting the insulation of telephone cables in a utility shaft that ran vertically between floors. Areas at the furthest extent of the fire were extinguished almost immediately and the original fire was put out in a few hours. Most of the damage was concentrated on the 11th floor, fueled by cabinets filled with paper, alcohol-based fluid for office machines, and other office equipment. Fireproofing protected the steel and there was no structural damage to the tower. In addition to damage caused by the fire on the 9th - 14th floors, water from the extinguishing of the fires damaged a few floors below. At that time, the World Trade Center had no fire sprinkler systems.[91]

February 26, 1993 bombing

Main article: 1993 World Trade Center bombing
Underground bombing.

The first Islamist terrorist attack on the World Trade Center occurred on February 26, 1993, at 12:17 p.m. A Ryder truck filled with 1,500 pounds (680 kg) of explosives, planted by Ramzi Yousef, detonated in the underground garage of the North Tower.[92] The blast opened a 100 foot (30 m) hole through five sublevels with the greatest damage occurring on levels B1 and B2 and significant structural damage on level B3.[93] Six people were killed and 50,000 other workers and visitors were left gasping for air within the 110 story towers. Many people inside the North Tower were forced to walk down darkened stairwells that contained no emergency lighting, some taking two hours or more to reach safety.[94][95]

Yousef fled to Pakistan after the bombing but was arrested in Islamabad in February 1995, and was extradited back to the United States to face trial.[96] Sheikh Omar Abdel Rahman was convicted in 1996 for involvement in the bombing and other plots.[97] Yousef and Eyad Ismoil were convicted in November 1997 for their carrying out the bombing.[98] Four others had been convicted in May 1994 for their involvement in the 1993 bombing.[99] According to a presiding judge, the conspirators' chief aim at the time of the attack was to destabilize the north tower and send it crashing into the south tower, toppling both landmarks.[100]

Following the bombing, floors that were blown out needed to be repaired to restore the structural support they provided to columns.[101] The slurry wall was in peril following the bombing and loss of the floor slabs that provided lateral support against pressure from Hudson River water on the other side. The refrigeration plant on sublevel B5, which provided air conditioning to the entire World Trade Center complex, was heavily damaged.[102] Subsequent to the bombing, the Port Authority installed photoluminescent markings in the stairwells.[103] The fire alarm system for the entire complex needed to be replaced because critical wiring and signaling in the original system was destroyed.[104] As a memorial to the victims of the bombing of the tower, a reflecting pool was installed with the names of those who had been killed in the blast.[105] However, the memorial was destroyed following the September 11 attacks. Names of the victims of the 1993 bombing are included in the National September 11 Memorial & Museum.

January 14, 1998 robbery

Main article: 1998 Bank of America robbery

In January 1998, Mafia member Ralph Guarino, who had gained maintenance access to the World Trade Center, arranged a three-man crew for a heist that netted over $2 million from a Brinks delivery to the eleventh floor of the World Trade Center.[106]

Lease

In 1998, the Port Authority approved plans to privatize the World Trade Center.[107] In 2001, the Port Authority sought to lease the World Trade Center to a private entity. Bids for the lease came from Vornado Realty Trust, a joint bid between Brookfield Properties Corporation and Boston Properties,[108] and a joint bid by Silverstein Properties and The Westfield Group.[109] By privatizing the World Trade Center, it would be added to the city's tax rolls[109] and provide funds for other Port Authority projects.[110] On February 15, 2001, the Port Authority announced that Vornado Realty Trust had won the lease for the World Trade Center, paying $3.25 billion for the 99-year lease.[111] Vornado outbid Silverstein by $600 million though Silverstein upped his offer to $3.22 billion. However, Vornado insisted on last minute changes to the deal, including a shorter 39-year lease, which the Port Authority considered nonnegotiable.[112] Vornado later withdrew and Silverstein's bid for the lease to the World Trade Center was accepted on April 26, 2001,[113] and closed on July 24, 2001.[114]

Destruction

See also: September 11 attacks, American Airlines Flight 11, United Airlines Flight 175, and Collapse of the World Trade Center
Seconds after United Airlines Flight 175 hits the South Tower, a fireball rises high.

On September 11, 2001, Islamist terrorists hijacked American Airlines Flight 11 and crashed it into the northern façade of the North Tower at 8:46:40 a.m., the aircraft striking between the 93rd and 99th floors. Seventeen minutes later, at 9:03:11 a.m., a second team of terrorists crashed the similarly hijacked United Airlines Flight 175 into the southern facade of the South Tower, striking it between the 77th and 85th floors.[115] The damage caused to the North Tower by Flight 11 destroyed any means of escape from above the impact zone, trapping 1,344 people.[116] Flight 175 had a much more off-centered impact compared to Flight 11, and a single stairwell was left intact; however, only a few people managed to pass through it successfully before the tower collapsed. Although the South Tower was struck lower than the North Tower, thus affecting more floors, a smaller number, fewer than 700, were killed instantly or trapped.[117]

At 9:59 a.m., the South Tower collapsed after burning for approximately 56 minutes. The fire caused steel structural elements, already weakened from the plane impact, to fail. The North Tower collapsed at 10:28 a.m., after burning for approximately 102 minutes.[118] At 5:20 p.m.[119] on September 11, 2001, 7 World Trade Center started to collapse with the crumble of the east penthouse, and it collapsed completely at 5:21 p.m.[119] owing to uncontrolled fires causing structural failure.[120]

The 3 World Trade Center, a Marriott hotel, was destroyed during the collapse of the two towers. The three remaining buildings in the WTC plaza were extensively damaged by debris and later were demolished.[121] The Deutsche Bank Building across Liberty Street from the World Trade Center complex was later condemned owing to the uninhabitable toxic conditions inside; it was deconstructed, with work completed in early 2011.[122][123] The Borough of Manhattan Community College's Fiterman Hall at 30 West Broadway was also condemned owing to extensive damage in the attacks and is slated for deconstruction.[124]

The World Trade Center on fire with the Statue of Liberty in the foreground

In the immediate aftermath of the attacks, media reports suggested that tens of thousands might have been killed in the attacks, as over 50,000 people could be inside the towers. Ultimately, 2,753 death certificates (excluding those for hijackers) were filed relating to the 9/11 attacks in New York, including one filed for Felicia Dunn-Jones, who was added to the official death toll in May 2007; Dunn-Jones died five months later from a lung condition linked to exposure to dust during the collapse of the World Trade Center.[125] Three other victims were then added to the official death toll by the city medical examiner's office: Dr. Sneha Anne Philip, who was last seen the day before the attacks; Leon Heyward, a man who developed lymphoma and subsequently died in 2008 as a result of dust ingestion during the events following the attacks to the Twin Towers;[126][127] and Jerry Borg, who died in December 2010 of pulmonary sarcoidosis determined in June 2011 to be the result of dust from the attacks.[8] Cantor Fitzgerald L.P., an investment bank on the 101st–105th floors of One World Trade Center, lost 658 employees, considerably more than any other employer,[128] while Marsh & McLennan Companies, located immediately below Cantor Fitzgerald on floors 93–101 (the location of Flight 11's impact), lost 295 employees, and 175 employees of Aon Corporation were killed.[129] In addition, 343 of the dead were New York City firefighters, 84 were Port Authority employees, of whom 37 were members of the Port Authority Police Department, and another 23 were New York City Police Department officers.[130][131][132] Ten years after the attacks, only 1,629 victims have been identified.[133] Of all the people who were still in the towers when they collapsed, only 20 were pulled out alive.[134]

New buildings

Main articles: One World Trade Center and World Trade Center site
The nearly-complete One and Four World Trade Center as seen from New Jersey. Two and Three World Trade Center are still in the early stages of construction.

After years of delay and controversy, reconstruction at the World Trade Center site is now underway. The new complex includes One World Trade Center (formerly known as the Freedom Tower), 7 World Trade Center, three other high-rise office buildings, a museum and memorial, and a transportation hub similar in size to Grand Central Terminal. The One World Trade Center was completed on August 30, 2012, and the final component of its spire installed on May 10, 2013. The Four World Trade Center is on track for completion and occupancy by 2014.[135][136] The 9/11 memorial is complete, and the museum opened on May 21, 2014.[137] The Three World Trade Center and the Transportation Hub are also making progress and are set to be finished by around 2015. Two World Trade Center's full construction has been placed on hold until tenants are found, but it is still expected to be completed before 2020.

History

World Trade Center
Towers
Other elements
Artwork
History
Preliminary site plans for the World Trade Center's reconstruction.

The process of cleanup and recovery continued 24 hours a day over a period of eight months. Debris was transported from the World Trade Center site to Fresh Kills on Staten Island, where it was further sifted. On May 30, 2002, a ceremony was held to officially mark the end of the cleanup efforts.[138] In 2002, ground was broken on construction of a new 7 WTC building located just to the north of the main World Trade Center site. Since it was not part of the site master plan, Larry Silverstein was able to proceed without delay on the rebuilding of 7 World Trade Center, which was completed and officially opened in May 2006; this had been considered a priority since restoring Consolidated Edison Co.'s electrical substation in the building's lower floors was necessary to meet power demands of Lower Manhattan.[139][140][141] While 7 World Trade Center was not part of the master plan for the Twin Towers site, Silverstein and Con Edison recognized that the rebuilding of 7 World Trade Center would have to be consistent with the master plan which was expected to re-open the street grid which had been blocked by the original World Trade Center super-block. As a result, the design for the new 7 World Trade Center allowed for the re-opening of Greenwich Street, which had been blocked by the original 7 World Trade Center.[142] A temporary PATH station at the World Trade Center opened in November 2003; it will be replaced by a permanent station designed by Santiago Calatrava.[143]

With the main World Trade Center site, numerous stakeholders were involved including Silverstein and the Port Authority, which in turn meant the Governor of New York State, George Pataki, had some authority. In addition, the victims' families, people in the surrounding neighborhoods, Mayor Michael Bloomberg, and others wanted input. Governor Pataki established the Lower Manhattan Development Corporation (LMDC) in November 2001 as an official commission to oversee the rebuilding process.[144] The LMDC held a competition to solicit possible designs for the site. The Memory Foundations design by Daniel Libeskind was chosen as the master plan for the World Trade Center site.[145] The plan included the 1,776 feet (541 m) Freedom Tower (now known as One World Trade Center) as well as a memorial and a number of other office towers. Out of the World Trade Center Site Memorial Competition, a design by Michael Arad and Peter Walker titled Reflecting Absence was selected in January 2004.[146]

On March 13, 2006, workers arrived at the World Trade Center site to remove remaining debris and start surveying work. This marked the official start of construction of the National September 11 Memorial & Museum, though not without controversy and concerns from some family members.[147] In April 2006, the Port Authority and Larry Silverstein reached an agreement in which Silverstein ceded rights to develop the Freedom Tower and Tower Five in exchange for financing with Liberty Bonds for Towers Two, Three, and Four.[148][149] On April 27, 2006, a ground-breaking ceremony was held for the Freedom Tower.[150]

In May 2006, architects Richard Rogers and Fumihiko Maki were announced as the architects for Towers Three and Four, respectively.[151] The final designs for Towers Two, Three and Four were unveiled on September 7, 2006. Tower Two, or 200 Greenwich Street, will have a roof height of 1,254 feet (382 m) and a 96 feet (29 m) tripod spire for a total of 1,350 feet (410 m). Tower Three, or 175 Greenwich Street will have a roof height of 1,155 feet (352 m) and an antenna height reaching 1,255 feet (383 m). Tower Four, or 150 Greenwich Street, will have an overall height of 946 feet (288 m).[152] On June 22, 2007, the Port Authority of New York and New Jersey announced that JP Morgan Chase will build Tower 5, a 42-story building on Site 5 occupied by the Deutsche Bank Building,[153] and Kohn Pedersen Fox was selected as the architect for the building.[154] Four renowned architects, including Spanish architect Santiago Calatrava, who designed the transit hub, One WTC designer David Childs of Skidmore, Owings and Merrill, and the famed British architect Norman Foster of Foster and Partners designed Tower Two and masterminded the iconic diamond design, will greatly enhance the street-level atmosphere of the rebuilt site. The projects will be complete between early 2013 to mid-2015 respectively.[155]

As of August 2011, One World Trade Center is at 80 stories with glass up to the 54th floor, Tower Four is up around 38 stories with glass up to the 15th floor, and the former Deutsche Bank Building has been completely dismantled and the Port Authority is working on their Vehicle Security Center.[156] The World Trade Center Transportation Hub's PATH hall is nearly complete. The memorial officially opened to relatives of the deceased on September 11, 2011, and to the general public on September 12. World Trade Center Tower Three's foundations are becoming visible, and will be completed in mid-2014 if Silverstein Properties can meet requirements set by the Port Authority, as they very likely will.[157][158] Tower Two will also be completed on schedule according to the construction company. In the December 2011, Tower Two's foundations are finished and is starting to assemble the frame.[159] Because numerous American and Chinese companies are "very interested" in leasing space at the WTC, Two World Trade Center is likely to be finished earlier than expected.[160] Publisher Conde Nast has agreed to move its headquarters to One World Trade Center, and with this shift, many more are expected to follow.[161]

In September 2013, it was announced that some of the construction fencing put up in 2001 to block civilian access to clean-up and construction processes will be permanently removed with the opening of WTC 4 in late 2013. This will be the first fencing removed since the opening of WTC 7 in 2006, and the first to provide access to the plaza. The removal of fencing will not only provide pedestrian access to the tower, but also a path through the site to the Memorial Plaza and surrounding streets. When WTC 1 opens in 2014, that surrounding fencing will also be removed providing access all around the tower and other entrance to the plaza. All construction fencing is expected to be removed with the opening of the final tower sometime in 2015-2018.[162]

A report in September 2013 revealed that, at the time of the report, the World Trade Center Association (WTCA) continues to negotiate with the One World Trade Center in regard to the title "World Trade Center", as the WTCA purchased the rights to the name in 1986. The WTCA is seeking free office space in the tower worth US$500,000 in exchange for the use of "World Trade Center" on the One World Trade Center tower and associated souvenirs.[163]

In early December 2013, Australian retail corporation Westfield announced that it will invest US$800 million for complete control of the retail space at the rebuilt center. Westfield, Australia's largest shopping mall operator, will purchase the Port Authority of New York and New Jersey’s 50 percent stake in the retail part of the World Trade Center site, increasing its total investment to more than US$1.4 billion.[164]

Controversy and criticism

Main article: World Trade Center rebuilding controversy

There was much debate regarding the future of Ground Zero following the destruction of the World Trade Center. Disagreement and controversy regarding who owned the property and what would be built there hindered construction at the site for several years. Many wanted the Twin Towers to be rebuilt, but stronger and taller. This movement was led by an informal organization called the Twin Towers Alliance.[citation needed] Others, considering the area sacred, did not want anything built there at all or wanted the entire site to become a memorial.[citation needed] Finally, a master plan was agreed upon, which would feature a memorial and museum where the original Twin Towers stood and six new skyscrapers surrounding it.

One World Trade Center itself has been met with criticism.[165] The original design, which was asymmetrical, significantly shorter, and called for an off-center spire, was met with much disapproval, causing a new one to be devised. A key feature of the final design, the fortified, windowless base, was also denounced as looking dreary and unwelcoming.[citation needed] To alleviate this problem, the designers decided to clad it with prismatic glass panels. Since the failure of that plan, it is now unclear what the base will be covered with. The name change from Freedom Tower to One World Trade Center was met with some criticism.[166] Governor of New York George Pataki stated in 2003 that, "The Freedom Tower isn't going to be One World Trade Center, it's going to be the Freedom Tower."[167]

See also

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Further reading

Wikimedia Commons has media related to World Trade Center (New York).
Records
Preceded by Tallest building in the world
1972–1974 		Succeeded by
Tallest building in the United States
1972–1974
Building with the most floors
1972–2001
Preceded by Tallest twin towers in the world
1972–1998 		Succeeded by

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