A blaze broke out at the former Peninsula Hospital in Far Rockaway Tuesday afternoon, the FDNY said.
The fire started in an outside boiler at the 51-15 Beach Channel Dr. site about 4:45 p.m. Firefighters were able to put out the blaze in about an hour, the FDNY said.
No one was injured in the fire.
Fire officials said the cause is still under investigation.
The hospital closed in 2012.