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The 13 million square feet of "Class A" office space (a designation used by realtors and builders to describe the highest quality, most desirable buildings) destroyed is equal to the entire office-space inventory of Atlanta or Miami. The entire seven-building complex, which included the offices of more than 400 companies and several federal, state and local government agencies, was destroyed. In New York, 6.5 hectares of buildings were directly affected when the Twin Towers collapsed.

Almost 3,000 people were killed in the 9/11 attacks, but also lost in the disaster were countless records, historical documents and works of art that were stored at the hundreds of offices destroyed when hijackers crashed three airliners into the World Trade Center and the Pentagon.
