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on 10/17/10Archinect has an article on the world's most expensive home, just completed:
http://archinect.com/news/article.php?id=101848_0_24_0_M
Also on this, from Forbes:
http://www.forbes.com/2008/04/30/home-india-billion-forbeslife-cx_mw_0430realestate_2.html
With lots of reader comments.