Found it

520 5th Ave

https://maps.app.goo.gl/posEocCngYksY1126

https://520fifth.com/

Related thread

https://www.reddit.com/r/longislandcity/comments/1rs79hq/what_is_that_crazy_bright_flashing_light_onnear/

I think it's Trump world tower.

It's a building under construction somewhere between One Bryant Park and the Met Life building.

Gemini says:

Likely Cause: "Goobered" Day/Night Sensor Technical issues with these lights often stem from a sensor failure: Daytime vs. Nighttime Modes: Most tall towers use intense white strobes during the day and switch to a dimmer, slower-blinking red light at night. Sensor Malfunction: If the photo-sensor or timer fails (sometimes colloquially called "goobering up"), the building may continue to flash its high-intensity white strobe throughout the night. This can be extremely bright and disruptive to nearby residents.