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Wednesday, January 14, 2004

On the afternoon of September 11, 2001, about seven hours after the twin towers of the World Trade Center had collapsed, the 45-story WTC 7 building across the street collapsed. Some debris from the collapsing towers had fallen on the building, and there were some fires inside. Neither seems to come close to explaining the building's collapse, according to this article. Perhaps the tenant list provides some clues:

Besides the Securities and Exchange Commission, the Central Intelligence Agency (CIA), the Department of Defense (DOD), the Internal Revenue Service (IRS) and New York?s Office of Emergency Management (OEM) were all tenants.

The article doesn't offer answers, just questions, especially: Why so little attention paid to the collapse of a fire-protected steel-framed building? According to the article, and the FEMA study that it cites, such buildings have rarely, if ever, collapsed due to fire. (The twin towers did, but they may also have been affected by the impact of the planes. There was no significant impact on WTC 7.)