NYC area helis based at large airports
Newark Int'l (EWR) has an active multi-heli fleet with a charter operator, as well as a stand-alone heliport across a river within its surface based airspace, housing tour copters, news, etc.
JFK has NYPD based at the nearby Floyd Bennett field. Not aware of any helis based at LGA, or if TEB has >30mil ops but there are several executive copters there.