Workers converting the Pfizer Building into a luxury residential tower were forced to evacuate on Tuesday after columns began to buckle.

Construction crews have been working night and day to stabilize a building on 42nd Street that had two columns buckle and several floors begin to sag.

But the high-profile nature of the development itself, as the largest ongoing office-to-residential conversion in the U.S. with the addition of 11 new stories, takes the implications beyond just liability and insurance.

Work began Tuesday night to shore up the failed columns on the project converting a commercial office building to apartments, said the city’s Department of Buildings commissioner.