254 Park Avenue South is located in Manhattan’s Gramercy Park neighborhood, with lively restaurants, stores, and much more just minutes away. On the outside, 254 Park Avenue South is a flawless example of neoclassical architecture in the Beaux Arts Style. On the inside, it's a triumph of modernism functionality and ease. Constructed in 1913 using an abundance of French limestone, 254 was recently rejuvenated by design principal, Charles Allem. The passion and expertise can be seen throughout, from the sensitive restoration of the historic facade to the carefully considered interior spaces.

With the exception of the building that gives the neighborhood its name, few Flatiron District buildings are as instantly recognizable and iconic as 141 Fifth Avenue. While 141 Fifth Avenue's classic Beaux Arts facade and gracefully curved shape is what makes it most recognizable, that gracious, circa-1897 terra cotta exterior conceals a luxurious surprise -- 141 Fifth Avenue is home to some of the most elegant condominiums for sale in the Flatiron District.

Sundari Lofts and Towers, located at 158 Madison Avenue in Manhattan's Murray Hill neighborhood, is a condominium building located in Manhattan's Murray Hill neighborhood offering luxury apartments for sale. Close to Madison Square Park, the Morgan Library, the post office and Whole Foods market, Sundari's location makes living convenient and comfortable. Residents are welcomed by an Asian-inspired lobby with a zen-like garden and cascading waterfall.

One Madison Park is located at 23 East 22nd Street, in the Flatiron District, and at a spot very near the top of the list of Manhattan's most luxurious new construction condominiums. With a suite of posh amenities and 90 spacious, sun-filled luxury condos for sale, One Madison Park rises above -- both vertically and in terms of luxury -- any other condominium listing in the Flatiron District. One Madison Park is unmistakably one of the boldest new condo buildings in Manhattan, and an impressive new addition to the Manhattan skyline.

The Sky House has an architectural pedigree few new construction luxury condominiums can match, but this 55-story luxury condo -- the brainchild of the award-winning Bruce Fowle of FXFOWLE Architects -- has more than good looks in its favor. From its prime Flatiron District location at 11 East 29th Street to its elegant condos for sale to its top-tier amenities, The Sky House offers full-spectrum luxury that few Flatiron condo listings can match and which any new construction Manhattan condo would envy.

Gramercy Park and the Flatiron District have become two of the most sought after neighborhoods in Manhattan real estate, but classic, pre-war architecture surely ranks high when it comes to both these Manhattan neighborhoods' considerable appeal. But as ONE48 proves, there's more to Gramercy condo listings than pre-war elegance.

323 Park Avenue South, a new, yet-to-be-built development, will be a boutique condominium that will be both modern and chic inside and out. Famed architects Gwathmey and Siegel were hired to make 323 Park Avenue South a cutting-edge building that meets or exceeds the standards of luxury in the current Manhattan condo listings. The luxury condos for sale at 323 Park Avenue South will feature high-end fixtures such as wide plank hardwood flooring, floor-to-ceiling windows, and marble bathrooms with heated floors.