Überarchitect David Rockwell transformed the magnificent 1911 Guardian Life building overlooking leafy Union Square into a new gem, successfully fusing original Beaux Arts detailing with bold, clean-lined modernism and a relaxing, grown-up air. Rooms boast distinctive touches, such as luminous mother-of-pearl counters in the bathrooms. Star chef Todd English's Mediterranean-accented Olives restaurant gets raves, and nightclub impresario Rande Gerber's dark and sultry Underbar is just downstairs.