Today in really rich people news: one family who owns a duplex, maisonette, full-floor co-op, and penthouse in a Fifth Avenue building has put all their holdings (more than 15,000 square feet) on the market for $72M. So close! Yet so far in the lifelong dream of owning a single-family mansion. Curbed NY has floorplans. [WSJ via Curbed NY]
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