"The Gertrude Rhinelander Waldo Mansion is a massive French Renaissance Revival mansion in New York City. It was originally designed in the 1890s by Kimball & Thompson and built in 1898. It is located at 867 Madison Avenue on the south-east corner of 72nd Street, Manhattan.
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Shortly after Ralph Lauren purchased the building in 1983, its value was a mere $6.4 million. In 2005 the building was worth $80 million!
some more info at: http://en.wikipedia.org/wiki/Rhinelander_Mansion