Building managers may also have to institute 'sign out' procedures at pre-determined meeting sites outside the building, or find other ways of accounting for those feeling in an emergency situation.
"It's not an exact science," he said, "and it doesn't mean that in the middle of a fire they don't run out and not sign out. There should be a place to have a head count."
While 140 Broadway provides full services on Saturdays, on Sunday, he said, "everybody has to sign out and the guards have strict instructions."