A man’s rotting corpse was discovered wedged inside a couch by a cleaning crew at a Brooklyn home for the mentally ill, according to authorities and sources.

The cleaning service arrived at the building on Union Street and Utica Avenue in Crown Heights around 8:50 a.m. Thursday — only for a resident to call the cops on them after mistaking them for burglars, according to the NYPD and sources.

A man’s rotting body was found wedged inside a couch by a cleaning crew at a Crown Heights home for the mentally ill. Google Maps Inside the building at Union Street and Utica Avenue in Crown Heights, where a cleaning crew stumbled upon the skeletal remains of a heavily decomposed man wedged in a sofa. Kyle Mazza/Shutterstock

Police left after realizing the mistake, but returned to the building 30 minutes later after the cleaners made a grim discovery, sources said.

The crew shockingly stumbled upon the skeletal remains of a heavily decomposed man’s body wedged in a sofa, sources added.

The building houses mentally ill and disabled residents, according to sources.

Officers outside the building. It’s not yet known if the man was a victim of a crime, as the Medical Examiner’s office is working to determine his cause of death. Kyle Mazza/Shutterstock

It’s not yet known if the man was a victim of a crime, as the Medical Examiner’s office is working to determine his cause of death.

An investigation into the finding remains ongoing.