@ColesStreetPothole This might have contributed: "“The general contractor chose to go non‑union for this project. All we want is responsible construction in the City of New York,” Johnson said. “They did not shore up the job correctly. The beams started crumbling, the floors started crumbling, and they might have to evacuate the other side.”"
https://pix11.com/news/columns-buckle-at-midtown-building-fdny/