As of June 2018, the buildings that had been rebuilt included 7 World Trade Center, One World Trade Center, 4 World Trade Center, and 3 World Trade Center. The original twin towers were completed in less than three years from the commencement of construction, and five years from the start of planning. They were the first skyscrapers in New York to exceed 100 m (330 ft) in height.
The cleanup and recovery for the site was also complicated by the presence of toxic chemicals at the base of the towers. Workers cleaning debris from the site's sidewalks found polychlorinated biphenyls (PCBs), which are toxic substances known to cause cancer if they are inhaled or ingested. They also discovered hazardous materials such as mercury, arsenic, and chromium that had been used in their manufacture. These findings led officials to declare part of the neighborhood a public health hazard zone.
There were nearly 3,000 people working on the site during the cleanup process. Many were exposed to dangerous levels of heat and smoke while trying to rescue people from the burning buildings. In addition, police officers and firefighters were sick with respiratory problems after responding to the scene.
People began leaving the area around 2004, when security was increased to keep out further vandalism. However, some residents continue to complain about noise and pollution generated by nearby construction sites.
The cleanup effort took more than 10 years to complete.
It first opened on April 4, 1973, and was destroyed during the September 11, 2001, attacks. 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), at 1,362 feet (415.1 m)—were the highest structures in the world at the time of their construction. They were also the largest buildings in the world until 1992 when the Petronas Towers in Malaysia were completed.
The World Trade Center complex included an underground transportation system called the World Trade Center Subway. It had two lines: one for local trains and the other for express buses. The system had four stations: Greenwich Village, World Trade Center, Battery Park, and Downtown Brooklyn.
Greenwich Village is a neighborhood in New York City located between West Broadway and Vesey Street. It is bordered by Hudson River to the west, Bowling Green to the east, Central Park to the south, and Washington Square Park to the north. The station is at the southwest corner of Greenwich Avenue and MacDougal Street, near the border with Clinton Hill.
World Trade Center is a neighborhood in Manhattan Beach, New York, adjacent to the East River. The neighborhood is bounded by Atlantic Avenue to the west, Northern Boulevard to the northeast, 34th Street to the southeast, and 59th Street to the southwest. The MTA's World Trade Center subway station is located at the intersection of Vesey Street and Church Avenue.
The World Trade Center towers were built beginning in 1966. The north tower was finished in 1970, and the south tower in 1971. The towers were constructed without the use of masonry by employing a revolutionary drywall technique strengthened by steel cores. The 1,776-foot (541 m) tall twin towers were the tallest buildings in New York until 1972 when they were surpassed by One World Trade Center.
The World Trade Center was one of the first large office buildings to be designed with moving staircases in place of fixed stairs. This reduced building costs because it eliminated the need for elevators.
In May 2001, after being damaged in the attacks, both the north and south towers were demolished down to their concrete foundations. The site is now a public park called "Reflecting Pool".
The trade centers were among the first high-rise buildings to be designed using computer technology before most engineers had used computers. The design process involved taking data on wind loads, heat transfer, and other factors and entering it into a computer. The software then generated a three-dimensional model that showed how the building would look under normal conditions as well as what might happen if something went wrong such as an earthquake or fire. Engineers could also test different materials's resistance to specific threats such as fire or knife blades.
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), at 1,362 feet (415.1 m)—were the highest structures in the world at the time of their construction. (1973-2001) The World Trade Center (WTC)
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|Topped-out||1 WTC: December 23, 1970 2 WTC: July 19, 1971|