From

9/11 Rudolph Guiliani Knew WTC 7 Would Collapse From Fire In 7 To 10 Hours, But Surpised It Imploded

At 5:20 PM on 9/11/01 the only building with a World Trade Center address that stood on a different block from the rest of the complex, 47-story steel-framed 7 World Trade Center, underwent a sudden total collapse. Officials and all government reports published since the attack that mention the building blame its collapse...