Large south-facing, high-floor three-bedroom/three-bathroom home in the full-service Crossing 23rd Condominium, located perfectly on the Flatiron/Gramercy border.    Measuring 1,556 square feet, the home has a generous, gracious layout and excellent light throughout. An entry foyer with coat closet opens to a 33-foot expanse for the living room and dining area.  The chef's kitchen has abundant counter and cabinet space and full-size appliances, including gas range and dishwasher.  The washer/dryer are housed in a closet in the back corner of the kitchen. Each of the three bedrooms is king-size.  The primary bedroom spans 18.5 feet and has an ensuite bathroom and large walk-in closet.  Each of the other two bedrooms are served by full bathrooms that sit adjacent to their entryways, and each has a sizable closet.  One of the bedrooms would make for a great multipurpose room that could include a home office and home gym.  The home is quiet, sitting so high above the street, and has multi-zone heating and air conditioning. Built in 2004, the Crossing 23rd Condominium at 121 East 23rd Street is a full-service building with 24-hour doorperson,concierge, live-in resident manager, and the amenities of a gym, residents' lounge, sun deck, bike storage, and additional laundry. The building is a block from Madison Square Park and is surrounded by all of the world-class dining, shopping, and cultural institutions of the Flatiron, NoMad, and Gramercy neighborhoods.  The 23rd Street 6-train station is on the same block, and the 23rd Street N/Q/R/W station is a block away at Madison Square Park.