Normally I am not a big fan of the minimalist style, but with floorspace and views like this I could make an exception:
"Contemporary Masterpiece" - http://www.benkielb.com/propertyListing.php?id=859
Worth it for $18,200,000 CAD (€13,144,749)? Perhaps, if I had that kind of money ;-)
Updated 2021 : note that the above post was originally published in 2007, but is left here for archival purposes. It seems the external link is now broken, so I have unlinked it.