Zeckendorfs to build tower by UN

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Macklowe Properties sold 10 UN Plaza, or 823 First Avenue, to the Zeckendorfs for $140 million. The Zeckendorfs plan to build a luxury 40-story condo on the site, which is between 46th and 47th streets and now has a low-rise building that is in the process of being demolished. Macklowe bought the land less than three years ago for $101 million. more [Post]