The New York City high-rise, deemed at risk of collapsing Tuesday, has 44 prior complaints against it, including allegations that a worker was blowing material off the roof, according to the city's Department of Buildings.

Crews are expected to finish emergency shoring of a Midtown Manhattan high-rise by Thursday, the building’s developer says. But the timeline and next steps in the “unusually ambitious” construction project remain unclear as investigators try to figure out what caused support columns to buckle on the 21st floor.

Two columns buckled and floors sagged in the former Pfizer headquarters in Midtown during an apartment conversion.

Officials said the investigation remains ongoing as engineers determine the root cause of the failure and develop a long-term repair plan.

Two structural support beams on an under-construction building in Manhattan started buckling Tuesday morning, triggering a large emergency response, officials say.

The 37-story building sparked concerns and emergency evacuations, some of which have since been lifted

A Manhattan high-rise that once served as Pfizer's HQ was evacuated Tuesday morning after officials found "buckled" columns and "sagging" floors.

An under-construction Manhattan high-rise at risk of collapse was stabilized late Tuesday and some evacuations of nearby buildings were lifted. “We’ve been monitoring the buil

NYC high-rise ‘collapse zone’ leaves guests and locals scrambling for hotel rooms as street closures continue - The high-rise previously housed offices for the pharmaceutical company Pfizer and was be