Cedar Grove Firefighter responded to the grounds of the former Essex County Hospital Center on the report of a structure fire. Upon arrival firefighter found a large volume of fire on the second floor extending into the attic. The roof was ventilated handlines stretched and the fire was extinguished. The fire was brought under control quickly however due to the buildings condition firefighters remained on scene for several hours extinguishing concealed pockets of fire. Assistance was provided by Verona, Little Falls, North Caldwell, Caldwell, Montclair Fire Departments. No injuries were reported, the fire cause is under investigation.