New to market: an exquisite a pied-a-terre or primary residence at I.M. Pei's discreetly luxurious Centurion Condominium.  Residence 5A is an elegantly proportioned ,1198 sq ft one bedroom plus library or occasional guestroom, with two full baths.  The current owner's impeccable interiors, flawless custom fixtures and upgraded finishes offer significant value enhancements.  A gracious gallery separates the oversized master suite from the living room, dining room and library;  the northern exposure overlooks the Centurion's serene water garden.  The highest quality is evident throughout, from the floor-to-ceiling sound insulated windows to the solid teak floors, generous closets, marble baths and premium appliances from Sub Zero, Wolf, Viking and Bosch.  The Centurion boasts an exceptional off-Fifth Avenue location, and the rare convenience of condominium living among the luxury merchants, art galleries, restaurants and hotels of Manhattan's prestigious Plaza District.  Its residents enjoy full time doorman and concierge services, a private gym, parking garage access and additional storage options.  Attractive common charges and a 421A tax abatement.