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The limestone prewar co-op at 950 Fifth Avenue has only seven units and a reputation as a haven for billionaire bachelors — reportedly single Boston Properties CEO Mort Zuckerman lives there, and bigwigs Dennis Kozlowski, formerly of Tyco, and Jonathan Tisch of Loews Hotel are ex-residents. For a cool $29 million, one newcomer could join the pack. The 12-room duplex that belongs to Robert Hurst, a Goldman Sachs alum and former president of the Whitney Museum of American Art, hit the market today, according to Streeteasy.com. The spread, unit 89, has views of Central Park, a maid’s room and on the second floor, via a limestone staircase, three bedrooms. Hurst, now a managing director at private equity firm Crestview Partners, could not be reached for comment and Brown Harris Stevens’ Alexis Bodenheimer, who is the exclusive agent with the brokerage’s Cathy Franklin, was mum on the listing. TRD