Real Estate magnate Robert S. Olnick’s art collection is set to go on sale at Christie’s next month, counting major Agnes Martin and Roy Lichtenstein works among its holdings.  The first selecton works offered next month, are spread over both the evening and day sales, and are valued at a total of $20 million.  “It was really about them making the rounds and buying what they liked,” says Laura Paulson, deputy chairman of Christie’s Americas.

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