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This house is usually just called 660 Fifth Avenue. My architect friends even call it "six-sixty". I will try to see if I can find the references in my library. Seven Letters22:51, 24 August 2010 (UTC)[reply]
William K. Vanderbilt House could also refer to any of Mr. Vanderbilt's other residences. The building standing on the site of the mansion now is called 666 Fifth Avenue, not 660 Fifth Avenue, so there is no ambiguity in my opinion. Seven Letters14:45, 23 June 2014 (UTC)[reply]
