World Trade Center ( 1973 -- 2001 ) - wikipedia World Trade Center ( 1973 -- 2001 ) This article is about the World Trade Center building complex prior to the September 11 attacks. For the current buildings, see World Trade Center ( 2001 -- present ). World Trade Center The original World Trade Center in March 2001. The tower on the left, with antenna spire, was 1 WTC. The tower on the right was 2 WTC. All seven buildings of the WTC complex are partially visible ; refer to map below. The red granite - clad building left of the Twin Towers was the original 7 World Trade Center. In the background is the East River. Show map of Manhattan Show map of New York Show map of the US Show all Location within Manhattan Record height Tallest in the world from 1971 to 1973 Preceded by Empire State Building Surpassed by Willis Tower General information Status Destroyed Location Lower Manhattan, New York City Coordinates 40 ° 42 ′ 42 '' N 74 ° 00 ′ 45 '' W ﻿ / ﻿ 40.71167 ° N 74.01250 ° W ﻿ / 40.71167 ; - 74.01250 Coordinates : 40 ° 42 ′ 42 '' N 74 ° 00 ′ 45 '' W ﻿ / ﻿ 40.71167 ° N 74.01250 ° W ﻿ / 40.71167 ; - 74.01250 Groundbreaking August 5, 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 Opening April 4, 1973 Destroyed September 11, 2001 Owner Port Authority of New York and New Jersey Other information Height Antenna spire 1 WTC : 1,728 feet ( 526.7 m ) Roof 1 WTC : 1,368 feet ( 417 m ) 2 WTC : 1,362 feet ( 415.1 m ) 3 WTC : 250 feet ( 76.2 m ) 4 and 5 WTC : 120 feet ( 36.6 m ) 6 WTC : 110 feet ( 33.5 m ) 7 WTC : 610 feet ( 185.9 m ) Top floor 1 WTC : 1,355 feet ( 413 m ) 2 WTC : 1,348 ft ( 411 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 m ) each 4, 5, and 6 WTC : 500,000 sq ft ( 50,000 m ) each 7 WTC : 1,868,000 sq ft ( 170,000 m ) Lifts / elevators 1 and 2 WTC : 99 each Design and construction Architect Minoru Yamasaki Emery Roth & Sons Developer Engineer Worthington, Skilling, Helle & Jackson, Leslie E. Robertson Associates Main contractor Tishman Realty & Construction Company References I. ^ World Trade Center at Emporis The original World Trade Center was a large complex of seven buildings in Lower Manhattan, New York City, United States. It featured the landmark twin towers, which opened on April 4, 1973, and were destroyed in 2001 during the September 11 attacks. At the time of their completion, the `` Twin Towers '' -- the original 1 World Trade Center, at 1,368 feet ( 417 m ) ; and 2 World Trade Center, at 1,362 feet ( 415.1 m ) -- were the tallest buildings in the world. Other buildings in the complex included the Marriott World Trade Center ( 3 WTC ), 4 WTC, 5 WTC, 6 WTC, and 7 WTC. All were built between 1975 and 1985, with a cost of $400 million ( $2,300,000,000 in 2014 dollars ). The complex was located in New York City 's Financial District and contained 13,400,000 square feet ( 1,240,000 m ) of office space. The World Trade Center experienced a fire on February 13, 1975, a bombing on February 26, 1993, and a bank 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 North and South Towers within minutes of each other ; two hours later, both had collapsed. The attacks killed 2,606 people in and within the vicinity of the towers, as well as all 157 on board the two aircraft. 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 buildings in the complex and caused catastrophic damage to ten other large structures in the surrounding area. The cleanup and recovery process at the World Trade Center site took eight months, during which the remains of the other buildings were demolished. The World Trade Center complex was rebuilt over more than a decade. The site is being rebuilt with six new skyscrapers, while a memorial to those killed in the attacks and a new rapid transit hub have both opened. One World Trade Center, the tallest building in the United States, is the lead building for the new complex, reaching more than 100 stories on completion in November 2014. Contents 1 Before the World Trade Center 2 Design and construction 2.1 Design 2.2 Construction 2.3 Criticism 3 Complex 3.1 North and South Towers 3.2 Top of the World observation deck 3.3 Windows on the World restaurant 3.4 Other buildings 4 Major events 4.1 February 13, 1975, fire 4.2 February 26, 1993, bombing 4.3 January 14, 1998, robbery 4.4 Other events 5 Lease 6 Destruction 7 New World Trade Center 8 See also 9 References 10 Bibliography 11 External links Before the World Trade Center The western portion of the World Trade Center site was originally under the Hudson River, with the shoreline in the vicinity of Greenwich Street. It was on this shoreline close to the intersection of Greenwich and the former Dey Street that Dutch explorer Adriaen Block 's ship, the Tyger, burned to the waterline in November 1613, stranding Block and his crew and forcing them to overwinter on the island. They built the first European settlement in Manhattan. The remains of the ship were buried under landfill when the shoreline was extended starting in 1797, and were discovered during excavation work in 1916. The remains of a second ship from the eighteenth century were discovered in 2010 during excavation work at the site. The ship, believed to be a Hudson River sloop, was found just south of where the Twin Towers used to stand, about 20 feet below the surface. Later, the area became Radio Row. New York City 's Radio Row, which existed from 1921 to 1966, was a warehouse district on the Lower West Side in the Financial District. Harry Schneck opened City Radio on Cortlandt Street in 1921, and eventually the area held several blocks of electronics stores, with Cortlandt Street as its central axis. The used radios, war surplus electronics ( e.g., ARC - 5 radios ), junk, and parts often piled so high they would spill out onto the street, attracting collectors and scroungers. According to a business writer, it also was the origin of the electronic component distribution business. 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 but the plans were put on hold in 1949. 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. Plans for the use of eminent domain to remove the shops in Radio Row bounded by Vesey, Church, Liberty, and West Streets began in 1961 when the Port Authority of New York and New Jersey was deciding to build the world 's first world trade center. They had two choices : the east side of Lower Manhattan, near the South Street Seaport ; and the west side, near the H&M station, Hudson Terminal. Initial plans, made public in 1961, identified a site along the East River for the World Trade Center. 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. Toward the end of 1961, negotiations with outgoing New Jersey Governor Meyner reached a stalemate. The Radio Row in 1936, with the Cortlandt Street station in the background, as seen in a photograph by Berenice Abbott 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. 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. With the new location and Port Authority acquisition of the H&M Railroad, New Jersey agreed to support the World Trade Center project. In compensation for Radio Row business owners ' displacement, the PANYNJ gave each business $3,000 each, without regard to how long the business had been there or how prosperous the business was. After the area had been purchased for the World Trade Center in March 1964, Radio Row was demolished starting in March 1965. It was completely demolished by 1966. 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. In subsequent years, the payments would rise as the real estate tax rate increased. Design and construction Main article : Construction of the World Trade Center Design A typical floor layout and elevator arrangement of the WTC towers. Play media ( video ) The World Trade Center in the 1970s, including scenes of its construction. On September 20, 1962, the Port Authority announced the selection of Minoru Yamasaki as lead architect and Emery Roth & Sons as associate architects. Yamasaki devised the plan to incorporate twin towers ; Yamasaki 's original plan called for the towers to be 80 stories tall, but to meet the Port Authority 's requirement for 10,000,000 square feet ( 930,000 m ) of office space, the buildings would each have to be 110 stories tall. 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. 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. Yamasaki 's design included building facades sheathed in aluminum - alloy. 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. 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. 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 local - express train operation that the New York City Subway system used, 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. Altogether, the World Trade Center had 95 express and local elevators. 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 ( JB&B ) 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. 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. 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. The spandrel plates were welded to the columns to create the modular pieces off - site at the fabrication shop. 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. 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. 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. 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. Only 1 WTC ( north tower ) actually had an antenna fitted ; it was added in 1978. 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. 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. 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. Experiments also were done to evaluate how much sway occupants could comfortably tolerate ; however, many subjects experienced dizziness and other ill effects. 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. Construction World Trade Center under construction in May 1971 In March 1965, the Port Authority began acquiring property at the World Trade Center site. 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. Groundbreaking for the construction of the World Trade Center took place on August 5, 1966. The site of the World Trade Center was located on landfill with the bedrock located 65 feet ( 20 m ) below. 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. 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. The 1,200,000 cubic yards ( 920,000 m ) 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. In January 1967, the Port Authority awarded $74 million in contracts to various steel suppliers, and Karl Koch was hired to erect the steel. Tishman Realty & Construction was hired in February 1967 to oversee construction of the project. Construction work began on the North Tower in August 1968 ; construction on the South Tower was under way by January 1969. 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. 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. The first tenants moved into the North Tower on December 15, 1970 ; the South Tower accepted tenants in January 1972. When the World Trade Center twin towers were completed, the total costs to the Port Authority had reached $900 million. The ribbon cutting ceremony was on April 4, 1973. 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 m ) superblock. Criticism The WTC site building arrangement 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. A group of small businesses affected sought an injunction challenging the Port Authority 's power of eminent domain. The case made its way through the court system to the United States Supreme Court ; the Court refused to accept the case. 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. 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 than that of comparable office space in other buildings. Others questioned whether the Port Authority should have taken on a project described by some as a `` mistaken social priority ''. The World Trade Center design brought criticism of its aesthetics from the American Institute of Architects and other groups. 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 ''. The Twin Towers were described as looking similar to `` the boxes that the Empire State Building and the Chrysler Building came in ''. 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. 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. 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 ''. 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. In fact, some gusts were so high that pedestrian travel had to be aided by ropes. 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. Complex On a typical weekday 50,000 people worked in the towers with another 200,000 passing through as visitors. The complex was so large that it had its own zip code : 10048. 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. North and South towers Lobby of Tower 1, looking south along the east side of the building, August 19, 2000. One World Trade Center and Two World Trade Center, commonly the Twin Towers, the idea of which was brought up by Minoru Yamasaki, were designed as framed tube structures, which provided tenants with open floor plans, uninterrupted by columns or walls. They were the main buildings of the World Trade Center. The North Tower ( One World Trade Center ), the tallest building in the world at 1,368 feet ( 417 m ) by the time of its completion, began construction in 1966 with the South Tower ( 2 World Trade Center ) ; extensive use of prefabricated components helped to speed up the construction process, and the first tenants moved into the North Tower in December 1970, while it was still under construction. When completed in 1973, the South Tower, Two World Trade Center ( the South Tower ) became the second tallest building in the world at 1,362 feet ( 415 m ) ; the South Tower 's rooftop observation deck was 1,362 ft ( 415 m ) high and its indoor observation deck was 1,310 ft ( 400 m ) high. Each tower stood over 1,350 feet ( 410 m ) high, and occupied about 1 acre ( 4,000 m ) of the total 16 acres ( 65,000 m ) of the site 's land. During a press conference in 1973, Yamasaki was asked, `` Why two 110 - story buildings ? Why not one 220 - story building ? '' His tongue - in - cheek response was : `` I did n't want to lose the human scale. '' South Tower lobby interior, overlooking the elevator core and red carpet from the balcony, October 1988. When completed in 1972, 1 World Trade Center became the tallest building in the world for two years, surpassing the Empire State Building after a 40 - year reign. The North Tower stood 1,368 feet ( 417 m ) tall and featured a telecommunications antenna or mast that was added at the top of the roof in 1978 and stood 362 feet ( 110 m ) tall. With the 362 - foot ( 110 m ) - tall antenna / mast, the highest point of the North Tower reached 1,730 feet ( 530 m ). Chicago 's Sears Tower, finished in May 1973, reached 1,450 feet ( 440 m ) at the rooftop. Throughout their existence, the WTC towers had more floors ( at 110 ) than any other building. This number was not surpassed until the advent of the Burj Khalifa, which opened in 2010. Top of the World observation deck Two World Trade Center 's observation deck with visitors looking down at Midtown Manhattan. 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, then were sent 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. 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 ). On a clear day, visitors could see up to 50 miles ( 80 km ). 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. Windows on the World restaurant Main article : Windows on the World Windows on the World restaurant interior, November 4, 1999 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. 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 ). 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. Upon reopening in 1996, Hors d'Oeuvrerie and Cellar in the Sky were replaced with the `` Greatest Bar on Earth '' and `` Wild Blue ''. 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. 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 The World Financial Center and Battery Park City, next to the World Trade Center, were built on reclaimed land. Five smaller buildings stood around the 16 acres ( 65,000 m ) 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 New Jersey. 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 to the vault. 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. Major events 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. February 26, 1993, bombing Main article : 1993 World Trade Center bombing Underground bombing aftermath The first 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. 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. Six people were killed and 1,042 others were injured during escape attempts complicated by smoke infiltration from the base of the building up to the 93rd floor of both 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. 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. Sheikh Omar Abdel Rahman was convicted in 1996 for involvement in the bombing and other plots. Yousef and Eyad Ismoil were convicted in November 1997 for their carrying out the bombing. Four others had been convicted in May 1994 for their involvement in the 1993 bombing. 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. Following the bombing, floors that were blown out needed to be repaired to restore the structural support they provided to columns. 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. After the bombing, the Port Authority installed photoluminescent markings in the stairwells. The fire alarm system for the entire complex needed to be replaced because critical wiring and signaling in the original system was destroyed. 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. 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. Other events In 1974, French high wire acrobatic performer Philippe Petit walked between the towers on a tightrope, as shown in the documentary film Man on Wire ( 2008 ), based on Petit 's book To Reach the Clouds : My High Wire Walk Between the Twin Towers ( 2002 ) ( released in paperback with the title Man on Wire ( 2008 ) ) and depicted in the feature film The Walk ( 2015 ). Petit walked between the towers eight times on a steel cable. In 1977, Brooklyn toymaker George Willig scaled the exterior of the South Tower ( 2 WTC ). In 1983, on Memorial Day, high - rise firefighting and rescue advocate Dan Goodwin successfully climbed the outside of the North Tower ( 1 WTC ). His stunt was meant to call attention to the inability to rescue people potentially trapped in the upper floors of skyscrapers. The 1995 PCA world chess championship was played on the 107th floor of the South Tower. Lease In 1998, the Port Authority approved plans to privatize the World Trade Center. 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, and a joint bid by Silverstein Properties and The Westfield Group. By privatizing the World Trade Center, it would be added to the city 's tax rolls and provide funds for other Port Authority projects. 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. 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. Vornado later withdrew and Silverstein 's bid for the lease to the World Trade Center was accepted on April 26, 2001, and closed on July 24, 2001. Destruction Main article : Collapse of the World Trade Center See also : September 11 attacks, American Airlines Flight 11, and United Airlines Flight 175 The scene just 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 group crashed the similarly hijacked United Airlines Flight 175 into the southern facade of the South Tower, striking it between the 77th and 85th floors. The damage caused to the North Tower by Flight 11 destroyed any means of escape from above the impact zone, trapping 1,344 people. 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. 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. At 5 : 20 p.m. 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. owing to uncontrolled fires causing structural failure. World Trade Center site after 9 / 11 attacks, seen from above with original building locations The Marriott World Trade Center, a 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. 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. 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. 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 World Trade Center, although the National Institute of Standards and Technology ( NIST ) estimated that approximately 17,400 occupants were in the towers at the time of the attacks. Ultimately, 2,753 death certificates ( excluding those for hijackers ) were filed relating to the 9 / 11 attacks in New York City, 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. 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 ; and Jerry Borg, who died in December 2010 of pulmonary sarcoidosis determined in June 2011 to be the result of dust from the attacks. 2,192 civilians died in and around the World Trade Center, including 658 employees of Cantor Fitzgerald L.P. ( an investment bank on the 101st -- 105th floors of One World Trade Center ), 295 employees of Marsh & McLennan Companies ( which was located immediately below Cantor Fitzgerald on floors 93 -- 101, the location of Flight 11 's impact ), and 175 employees of Aon Corporation. In addition to the civilian deaths, 343 New York City Fire Department ( FDNY ) firefighters were killed in the attacks, as well as 71 law enforcement officers, including 37 members of the Port Authority Police Department ( PAPD ) and 23 members of the New York City Police Department ( NYPD ). Ten years after the attacks, remains of only 1,629 victims had been identified. Of all the people who were still in the towers when they collapsed, only 20 were pulled out alive. New World Trade Center Main article : World Trade Center ( 2001 -- present ) Rebuilding of the World Trade Center One WTC Construction In popular culture 2 -- 7 WTC 5 7 Other elements Liberty Park National September 11 Memorial & Museum Performing Arts Center Transportation Hub Vehicular Security Center Westfield World Trade Center St. Nicholas Greek Orthodox Church 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 National September 11 Memorial. The reflecting pools are on the site of the Twin Towers. The first new building at the site was 7 WTC, 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. 1 WTC opened on November 3, 2014 ; 4 WTC opened on November 13, 2013 ; and 3 WTC is expected to open in spring 2018, As of November 2013, according to an agreement made with Silverstein Properties Inc., the new 2 WTC will not be built to its full height until sufficient leasing is established to make the building financially viable. In Summer 2015, Silverstein Properties revealed plans for a redesigned Tower 2 with News Corp as the core tenant ; the Bjarke Ingels - designed structure was expected to be finished by 2020. 5 WTC will be developed by the Port Authority of New York and New Jersey, but above - ground construction was suspended in November 2013 due to a lack of tenants as well as disputes between the Port Authority and the Lower Manhattan Development Corporation. See also List of tallest buildings in New York City The Philippe Petit high wire walk between the Towers The Sphere World Trade Center in popular culture References ^ Jump up to : `` History of the Twin Towers ''. Port Authority of New York and New Jersey. June 1, 2014. Archived from the original on September 1, 2013. Retrieved August 17, 2015. Jump up ^ `` Twin Towers Engineered To Withstand Jet Collision ''. Seattle Times. February 27, 1993. 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New York : Fordham University Press. ISBN 0 - 8232 - 2190 - 3. Darton, Eric ( 1999 ). Divided We Stand : A Biography of New York 's World Trade Center. Basic Books. ISBN 0 - 465 - 01727 - 4. Fanella, David A., Arnaldo T. Derecho, S.K. Ghosh ( September 2005 ). Design and Construction of Structural Systems ( NCSTAR 1 - 1A ) ( PDF ). Final Report on the Collapse of the World Trade Center Towers. National Institute of Standards and Technology ( NIST ). CS1 maint : Multiple names : authors list ( link ) Gillespie, Angus K. ( 1999 ). Twin Towers : The Life of New York City 's World Trade Center. Rutgers University Press. ISBN 0 - 8135 - 2742 - 2. Glanz, James & Eric Lipton ( 2003 ). City in the Sky. Times Books. ISBN 0 - 8050 - 7428 - 7. Lew, H.S., Richard W. Bukowski, Nicholas J. Carino ( September 2005 ). Design, Construction, and Maintenance of Structural and Life Safety Systems ( NCSTAR 1 - 1 ) ( PDF ). Final Reports of the Federal Building and Fire Investigation of the World Trade Center Disaster. National Institute of Standards and Technology ( NIST ). CS1 maint : Multiple names : authors list ( link ) Reeve, Simon ( 1999 ). The New Jackals : Ramzi Yousef, Osama bin Laden and the Future of Terrorism. Northeastern University Press. ISBN 1 - 55553 - 509 - 7. Ruchelman, Leonard I. ( 1977 ). The World Trade Center : Politics and Policies of Skyscraper Development. Syracuse University Press. ISBN 0 - 8156 - 2180 - 9. National Construction Safety Team ( September 2005 ). Federal Building and Fire Safety Investigation of the World Trade Center Disaster ( NCSTAR 1 -- 6 ) ( PDF ). Structural Fire Response and Probable Collapse Sequence of the World Trade Center Towers. National Institute of Standards and Technology ( NIST ). `` World Trade Center Building Performance Study ''. Federal Emergency Management Agency. May 2002. Archived from the original on April 30, 2011. Retrieved June 9, 2011. External links Wikimedia Commons has media related to World Trade Center ( New York City ). World Trade Center -- Silverstein Properties World Trade Center -- Port Authority of New York & New Jersey World Trade Center at Curlie ( based on DMOZ ) Building the Twin Towers : A Tribute -- slideshow by Life magazine New York : A Documentary film features the construction and destruction of the World Trade Center in the seventh and final episode of the series directed by Ric Burns. Historic video with scenes of World Trade Center under construction in 1970 Historic American Buildings Survey ( HABS ) No. NY - 6369, `` World Trade Center Site '', 103 photos, 21 data pages, 8 photo caption pages Records Preceded by Empire State Building Tallest building in the world 1970 -- 1974 ( North Tower ) Succeeded by Willis Tower Tallest building in the United States 1970 -- 1974 ( North Tower ) Tallest building with the most floors 1970 -- 2001 Tallest building with the most floors ever 1970 -- 2008 Succeeded by Burj Khalifa Preceded by City National Plaza Tallest twin towers in the world 1970 -- 1998 Succeeded by Petronas Towers New York City 's World Trade Center First WTC ( 1973 -- 2001 ) Construction Towers One Two Three Four Five Six Seven Windows on the World Mall The Bathtub Tenants One Two Four Five Six Seven Art Bent Propeller The Sphere The World Trade Center Tapestry World Trade Center Plaza Sculpture Ideogram Sky Gate, New York Major events February 13, 1975 fire February 26, 1993 bombing January 14, 1998 robbery September 11, 2001 attacks Collapse Timeline Victims Aftermath Deutsche Bank Building St. Nicholas Greek Orthodox Church Second WTC ( 2001 -- present ) Site, towers, and structures One Construction Two Three Four Five Seven Performing Arts Center Vehicular Security Center Liberty Park St. Nicholas Greek Orthodox Church Westfield Mall Rapid transit PATH stations Transportation Hub New York City Subway stations Chambers Street -- WTC / Park Place ( 2, ​ 3 ​, A, ​ C, and ​ E trains ) Cortlandt Street ( N, ​ R, and ​ W trains ) Cortlandt Street ( 1 and ​ 2 trains ) Fulton Street ( 2, ​ 3 ​, 4, ​ 5 ​, A, ​ C ​, J, and ​ Z trains ) Fulton Center Corbin Building Dey Street Passageway 9 / 11 memorials 9 / 11 Tribute Center National September 11 Memorial & Museum Competition Memory Foundations Tribute in Light America 's Response Monument Empty Sky Relics from original WTC The Sphere Cross Survivors ' Staircase People Minoru Yamasaki Emery Roth & Sons Larry Silverstein Austin J. Tobin David Childs Michael Arad THINK Team Daniel Libeskind Leslie E. Robertson Other Park51 Project Rebirth Take Back The Memorial West Street pedestrian bridges In popular culture Film Music 9 / 11 - related media featuring One WTC 10048 ZIP code Former : IFC Former : Twin Towers 2 Brookfield Place Brookfield Place 200 Liberty Street 225 Liberty Street 200 Vesey Street 250 Vesey Street Winter Garden Atrium New York Mercantile Exchange September 11 attacks Timeline Planning September 11, 2001 World Trade Center collapse Remainder of September October Post-October Victims Casualties emergency workers Hijacked airliners American Airlines Flight 11 United Airlines Flight 175 American Airlines Flight 77 United Airlines Flight 93 Suspected hijackings Korean Air Flight 85 Delta Air Lines Flight 1989 Crash sites World Trade Center World Trade Center site The Pentagon Stonycreek / Shanksville, Pennsylvania Aftermath Immediate repercussions Closings and cancellations Detentions Communication Post-9 / 11 Economy Local health Airport security Reactions Conspiracy theories Rudy Giuliani Unsuccessful terrorist plots Response U.S. government response U.S. military response War on Terror Afghanistan North - 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Steel Tower Skycity Square Capital Tower Tameer Commercial Tower Tour Financial Hub Center Two World Trade Center Former World Trade Center ( 1973 -- 2001 ) See also Proposed supertall skyscrapers List of architects of supertall buildings Architecture by Minoru Yamasaki Skyscrapers One Woodward Avenue ( 1963 ) IBM Building ( 1963 ) The Century Plaza Hotel ( 1966 ) M&T Bank Center, Buffalo ( 1967 ) World Trade Center Tower 1, Tower 2, Buildings 4, 5 and 6 ( 1970 -- 1971 ) Montgomery Ward Corporate Headquarters Tower ( 1972 ) Century Plaza Towers ( 1975 ) Bank of Oklahoma ( 1977 ) Rainier Bank Tower ( 1977 ) Federal Reserve Bank of Richmond ( 1978 ) 100 Washington Square ( 1981 ) Torre Picasso ( 1988 ) Columbia Center ( 1989 -- 2000 ) Airports St. Louis Lambert International Airport main terminal ( 1956 ) Dhahran International Airport terminal ( 1961 ) Eastern Airlines terminal at Logan Airport ( 1969 ) King Fahd International Airport master plan ( 1977 ) Houses of worship North Shore Congregation Israel ( 1964 ) Temple Beth El ( 1974 ) Shinji Shumeikai Founder 's Hall ( 1982 ) Other buildings Federal Reserve Bank of Chicago Detroit Branch Building annex ( 1951 ) Pruitt -- Igoe housing project ( 1954 ) Grosse Pointe University School ( 1954 ) Military Personnel Records Center ( 1955 ) McGregor Memorial Conference Center ( 1957 ) Prentis Building and DeRoy Auditorium Complex ( 1959 ) Robertson Hall at Princeton University ( 1965 ) Pacific Science Center ( 1962 ) Irwin Library at Butler University ( 1963 ) Oberlin Conservatory of Music ( 1963 ) Quo Vadis Entertainment Center ( 1966 ) Dr. John Archer Library ( 1967 ) Japan Center ( 1968 ) Tulsa Performing Arts Center ( 1976 ) Istanbul Cevahir ( 1987 ) Landscape architecture Wascana Centre and University of Regina - 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Question: how tall are the twin towers in new york
Answer: 1,362