Just in case it helps anyone... this is from their website (which is understandably getting quite bombarded right now) Best of luck to everyone, today is a very dark day...
FASCINATING FACTS
More than 1.2 million cubic yards of earth and rock were excavated to make way for the World Trade Center. The excavated material was placed in the Hudson River to create 23.5 acres of new land deeded to the City of New York. This landfill area is now Battery Park City.
More than 200,000 tons of steel, far more than the amount required for the construction of the Verrazano Narrows Bridge, was used in the World Trade Center's construction.
The 425,000 cubic yards of concrete used in building the World Trade Center is enough to build a five-foot wide sidewalk from New York City to Washington, D.C.
At peak periods of construction, some 3,500 workers were on the site daily.
There are 43,600 windows in the Twin Towers with over 600,000 square feet of glass window area cleaned by automatic window washing machines traveling on stainless steel tracks.
With 60,000 tons of cooling capacity, the World Trade Center's refrigeration plant is the largest in the world.
The 360-foot television mast atop One World Trade Center supports 10 main television antennas, numerous auxiliary antennas and a master FM antenna. Transmissions from the mast began in June, 1980. Ten television stations in the metropolitan area, including all the major networks, broadcast from the mast. In addition, six stations broadcast high-definition, digital television from the World Trade Center.
The Tower's skylobby elevator systems separate express from local runs. There are 239 elevators and 71 escalators in the four buildings operated by the Port Authority at the complex. The sky lobby express elevators are capable of carrying 55 people, a 10,000 pound capacity. Express elevators can travel at speeds of up to 27 feet per second.
OFFICE BUILDING PROFILES
Architects: Minoru Yamasaki & Associates; Emery Roth & Sons, P.C.
Plot: 960 x 710 (681,600 sf) shared site for 1, 2, 4, 5 and 6 World Trade Center
1 WORLD TRADE CENTER - NORTH TOWER
Built: 1970
Height: 110 Floors
Floor Sizes: (9 - 105) 45,000-50,000 sf
Elevators: 97 passenger, 6 freight
2 WORLD TRADE CENTER - SOUTH TOWER
Built: 1972
Height: 110 Floors
Floor Sizes (2 - 109) 45,000 - 50,000 sf
Elevators: 97 passenger, 6 freight
4 WORLD TRADE CENTER - SOUTHEAST PLAZA BUILDING
Built: 1977
Height: 9 Floors
Floor Sizes: (2 - 9) 84,500 sf
Elevators: 12 passenger, 1 freight
5 WORLD TRADE CENTER - NORTHEAST PLAZA BUILDING
Built: 1972
Height: 9 Floors
Floor Sizes: (2 - 9) 108,400 sf
Elevators: 9 passenger
6 WORLD TRADE CENTER - U.S. CUSTOMHOUSE
Built: 1975
Height: 8 Floors
Floor Sizes: (2- 8) 80,400 sf
Elevators: 8 passenger, 4 freight
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