The Rhinelander Mansion

Built as a private home in 1898, now Ralph Lauren’s flagship, corner of 72nd and Madison Avenue.

And I think, home to some of the finest 

holiday windows in the city.

From Wikipedia,”the most recent sale [of the Rhinelander Mansion] in 2005 being reported at a record US $80 million.”

http://en.wikipedia.org/wiki/Rhinelander_Mansion