Human remains were found inside the building located at 196 13th Street in the Gowanus section just after 2 p.m.
Officers were told by construction workers that they recovered "highly decomposed human remains" inside a third-floor apartment.
RELATED: Eyewitness News is tracking crime and safety across New York City and in your neighborhood
The Medical Examiner's Office will determine the cause of death.
An investigation is underway.
----------
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube