Lawyers at Willkie Farr & Gallagher and Sidley Austin were still forced to work outside their New York offices Tuesday afternoon, one day after a helicopter crash-landed on the roof of their building at 787 Seventh Ave.

Steven Gartner, Willkie’s co-chairman, said that tenants still had not been told when they could return as of midafternoon on Tuesday. The building, which was evacuated immediately after the Monday afternoon crash, first has to be cleared for occupancy by authorities and building management, he said, noting an investigation by the National Transportation Safety Board.