The NYC Department of Buildings says it fell from the 53rd floor of a high-rise building on Billionaire's Row around 5 p.m.
Investigators say the 11-feet-by-2-feet window section had previously been damaged before it fell.
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Contractors on site had plans to replace the window pane.
Fortunately nobody was on the ground where the glass fell and no injuries were reported.
Officials are still deciding if any citations will be issued.
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