A futuristic showstopper mansion, owned by diamond mining company heiress Rebecca Oppenheimer, the granddaughter of former De Beers Consolidated Mines Chairman Harry Oppenheimer, is the most expensive house to ever come on the market in Pierce, Kitsap or Thurston counties, according to Morrison House Sotheby’s International Realty Owner and Founding Broker Michael Morrison. Morrison has the $11 million listing.

Oppenheimer spoke to me by cellphone from Cape Town, South Africa where she now lives…

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