A co-op once owned by the late socialite Lee Radziwill hit the market asking just under $17 million.  The duplex at 969 Fifth Avenue last traded more than two decades ago, when Suzanne von Liebig, the wife of the late inventor and philanthropist William von Liebig, purchased it for $7.6 million, according to the listing broker, Adam Modlin of the Modlin Group. Von Liebig renovated the apartment, which spans the fifth and sixth floors of the building between East 77th and East 78th streets, before moving in in early 2004. Modlin said she has “maintained it at a high level,” […]

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