On the upper and lower boundaries of these deviations were transfer hallways contained within the stairwell proper. All three stairwells ran essentially straight up and down, except for two deviations in stairwells A and C where the staircase jutted out toward the perimeter of the building. The World Trade Center Complex as of 9/11ДЇloor below the mezzanine.

Stairwell B ran from the 107th floor to level B6, six floors below ground, and was accessible from the West Street lobby level, which was one Stairwells A and C ran from the 110th floor to the raised mezzanine level of the lobby. Generally, elevators originating in the lobby ran to 'sky lobbies' on higher floors, where additional elevators carried passengers to the tops of the buildings. 1Д®ach tower contained three central stairwells, which ran essentially from top to bottom, and 99 elevators. On any given workday, up to 50,000 office workers occupied the towers, and 40,000 people passed through the complex. Both towers had 110 stories, were about 1,350 feet high, and were square each wall measured 208 feet in length. The buildings were connected by an underground mall (the concourse).The Twin Towers (1 WTC, or the North Tower, and 2 WTC, or the South Tower) were the signature structures, containing 10.4 million square feet of office space. The WTC actually consisted of seven buildings, including one hotel, spread across 16 acres of land. Construction began in 1966, and tenants began to occupy its space in 1970.The Twin Towers came to occupy a unique and symbolic place in the culture of New York City and America.

The World Trade Center (WTC) complex was built for the Port Authority of New York and New Jersey. On the morning of September 11, 2001, the last best hope for the community of people working in or visiting the World Trade Center rested not with national policymakers but with private firms and local public servants, especially the first responders: fire, police, emergency medical service, and building safety professionals.Д«uilding Preparedness The World Trade Center. Emergency response is a product of preparedness.

Which tower fell first