Authorities say a piece of scaffolding fell off an office high-rise building at 101 Barclay Street in TriBeCa around 2:15 and hit the person, who was walking on the sidewalk.
The victim suffered a non-life threatening injury and was taken to Bellevue Hospital for treatment.
The Department of Buildings has inspectors at the scene.
The 25-story building is owned by Bank of New York Mellon.
"We are looking into this issue, and our thoughts are with the injured person," a spokesperson said in a statement.
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