Bill Koch owns a roughly 90-acre estate near Aspen. He listed it in 2016 for $80 million, but has since taken it off the market.

Bill Koch owns a roughly 90-acre estate near Aspen. He listed it in 2016 for $80 million, but has since taken it off the market.

Charles and his late brother David became known for their financial support of conservative and arts causes. But they, as well as two other siblings, have also quietly purchased some of the most remarkable homes in the world. A look at their valuable portfolio.72

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