New York City Sweeps 100 Sites After Brooklyn Building Collapse

By Nathan Brooks

Mayor Zohran Mamdani said New York City would sweep 100 construction sites after a three-story Brooklyn apartment building collapsed, killing eight people, including two children, and injuring 18.

As of Thursday afternoon, Mamdani said eight people had died and 18 had been injured. Four of the injured were firefighters. One injured person was in critical condition, while most of those hospitalized were stable, Mamdani said.

According to city officials, the building collapsed shortly after 4 p.m. Wednesday and trapped people inside the rubble. Emergency crews worked through the night to rescue survivors. Mamdani announced the 100-site response on Thursday.

At Thursday’s press briefing, Mamdani said officials had identified five entities associated with the neighboring construction site. Those entities were also associated with 100 sites across the city, and the Department of Buildings would begin sweeping those locations the same day.

“A tragedy of this magnitude demands a comprehensive and thorough investigation that includes both the construction site and the building which collapsed,” Mamdani said. He said the probe “will extend to any and all sites that those who operated these sites are currently operating.”

Buildings Commissioner Ahmed Tigani said construction workers were digging on the neighboring lot when the building collapsed. That detail placed the adjoining excavation at the center of the city’s immediate enforcement response, even as investigators continued to examine the collapsed building itself.

City building records said New York City had issued a stop-work order for the adjoining lot. The lot was an excavation site where a new building and cellar had been proposed, and the records cited unsafe construction operations.

The neighboring site also had a previous enforcement action. In March, the city ordered the demolition to stop because “overhead protection was not installed or provided for adjacent properties,” according to city building records. The city said the violation was later resolved.

According to the city’s account, it remained unclear whether that March violation played any role in Wednesday’s collapse. The earlier action therefore remains part of the safety context without an established causal link.

At the briefing, Mamdani said: “These were our friends and our neighbors, parents and children.” He added: “Let us continue to hold close those who have been plunged into unimaginable grief.”

What changes for construction crews?

The immediate operating facts are narrow but consequential. Five entities are tied to the neighboring site. The Department of Buildings will visit 100 associated locations. And a stop-work order applies to the excavation where a new building and cellar had been proposed. For operators, that means inspections beyond a single damaged property and a halt at the adjoining lot.

Mamdani’s language raises the potential reach further. He said the investigation would cover every site those operators currently run, not only the locations in the initial sweep. For an operator managing several active projects, the response to the neighboring lot becomes a review of its full current portfolio.

Mamdani’s review has two physical anchors: the collapsed building and the neighboring construction site. One concerns the structure that failed; the other concerns the excavation and the five entities linked to it. The stated scope makes the current operating footprint of those entities the broader enforcement issue.

City officials still did not know how many people were inside the building or how many remained unaccounted for. That gap leaves the eight deaths and 18 injuries reported by Thursday afternoon without a complete accounting.

The next test for the five entities is what the 100-site sweep finds. Mamdani said the investigation would reach every site they currently operate, while the adjoining excavation remains under a stop-work order.