'Extremely serious': NYC building at risk of collapse amid renovation

An under-construction Midtown Manhattan building that was evacuated after structural columns buckled remains unstable, New York City Mayor Zohran Mamdani said. He described the situation as “extremely serious” and said crews have witnessed additional movement since arriving at the scene.

A structural engineer tells CNN that this—the largest renovation in U.S. history—likely caused the loads to shift, creating these structural issues.

0:00 A structural engineer explains how loads shift during renovations
2:23 How engineers can stabilize the building
4:33 CNN reports from the scene

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