130 Liberty Street, otherwise known as the Deutsche Bank Building, was once a 42-story skyscraper that stood adjacent to the Twin Towers. But the collapse of the towers during September 11 tore a 24-story gash into the façade of the building. It destroyed much of the interior of the structure, leaving steel and concrete poking out of the building. Now despite this damage, the frame of the building was in tact and it would have been possible to rebuild. However, that gash that created approximately 1,700 broken windows left a huge part of the building open and exposed. Rain, snow, and other outside elements poured into the building, and brought in high humidity and condensation from outside temperature variation. Additionally, there was standing water in the basement that came from firefighting activities and broken pipes.
Of course, this led to extensive and uncontrolled bacteria and mold growth which spread from the basement throughout the remains of the Deutsche Bank Building.