Sotheby’s auction house is enjoying a renaissance since moving to Madison Avenue from Yorkville. Now “the ladies who lunch” are dropping in on a daily basis.

Sotheby’s moved into the former home of the Whitney Museum , on the corner of E. 75th St., and promptly set two records.

Gustav Klimt’s 1914 painting “Portrait of Elisabeth Lederer,” from the trove of the Leonard Lauder collection, went for $236 million, the highest price for any work ever sold by the auction house. A 1940 Frida Kahlo self-portrait, titled “The Dream (The Bed),” was hammered down for nearly $55 million , setting a new record for any female artist.

One source said, “Sotheby’s was losing money before on York Avenue, and the staff was worried about losing jobs in a soft art market. What a differ

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