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Rafael Viñoly is best known for designing 432 Park, the tallest residential building in the Western Hemisphere, but he makes time for private homes, too–at least when they have headline-making features like a bullet-proof glass facade. His firm was first tapped to design this Upper East Side townhouse by Argentinian billionaire Eduardo Eurnekian to serve as his home and U.S. headquarters, but it looks like he instead decided to list the finished product for $50 million. — 6sqft