Dennis Olsen and Darlene Higgins Olsen put nearly three years of work into the 7,100-square-foot house on Thunder Lake in ...

You can’t talk about the house on Thunder Lake without talking about Dennis Olsen. For Olsen, who grew up in a low-income family and at one time lived in a $7-a-month apartment, the house was a dream.

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Billionaire Bill Koch has put his 16,600-square-foot log mansion on 52 acres in Aspen up for sale for $125 million.