It depends on the building CPW has some of the most expensive and exclusive buildings in NYC (e.g. the Dakota, the Beresford, 15CPW).
I agree with @Eric Hassan, you pay for the building, services/amenities and location. I grew up in Manhattan on the UWS (e.g. doorman, valet parking, concierge, gym, etc.) and it was a wonderful place to live but yes very expensive; I was glad I didn’t have to worry about the costs but I can tell you my parents thought it was well worth it.