That bright blue light in the center of the photo, which your correspondent took from the roof of his building, appears to be the source of the amazingly loud party noise pounding the Heights this (Thursday) evening. As best I can determine this is the Watermark Bar, located on Pier 15, which is also a dock for Hornblower Cruises NYC.
I tried to phone Watermark–212-742-8200–and after many rings got a message that no one was available to take a call. I’ve submitted an on-line 311 report.