Hazardous material was discovered last month as crews attempted to replace the mayoral mansion 's leaky roof . Officials do not believe the collapse poses any serious risk to Mayor de Blasio and his family , who will remain in the mansion during the renovation . Work will take place at same time as replacement of the mansion 30-year - old roof . Both repairs should be completed by October or November .
Hazardous material was discovered last month as crews prepared to replace the mayoral mansion 's leaky roof . Officials do not believe the work poses any health risk to Mayor de Blasio and his family , who will remain in the home during the renovation . Work will take place at same time as replacement of the mansion 30-year-old roof . Both jobs should be completed by October or November .