New York City officials closed streets around a Midtown Manhattan construction site on Tuesday after structural columns buckled inside the former Pfizer headquarters building, which is being converted into apartments. Mayor Zohran Mamdani said firefighters responded to reports of a structural issue and found two buckled columns, cracks, and sagging floors on the 21st floor of the 37-story building. No injuries were reported, and all workers were accounted for, but officials warned the building remained unstable as engineers and emergency crews monitored the site and worked to secure the structure.