@nbcnewyork: The collapsed building, with a business on the ground floor and two stories of residential units above, was next to an excavation site where single-floor building had been cleared. “We will find out what happened and we will share that information with New Yorkers,” Mamdani said. There were “five main entities,” connected to that excavation project with crews from those companies working at about 100 construction sites around New York City, Mamdani said. “Our Department of Buildings is commencing sweeps of those sites today,” Mamdani said. #mamdani #collapse #ny #building #investigation