One57, located near Carnegie Hall, broke ground in 2009, setting off a high-end condo construction boom in midtown Manhattan. At least six skyscrapers aimed at multimillionaires, including Zeckendorf Development Co.’s 520 Park Ave. and Vornado Realty Trust’s 220 Central Park South, are under construction in the area. Another tower off 57th Street, 432 Park Ave., where a buyer agreed to pay $95 million for a penthouse, will open later this year.

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