The incident left the pair dangling from a high-rise building in Lower Manhattan, according to a report by WABC-TV.
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The workers were wearing safety harnesses, and were pulled to safety through a window on the 20th floor.
The New York Fire Department said it was alerted to the collapse at around 9.10am by a number of 911 calls.
The window on the 20th floor was removed and the workers were successfully rescued in a co-ordinated effort by teams on the street and on a platform on the building.