Billionaire energy mogul Bill Koch is looking to cash in on Aspen’s red-hot luxury real estate market by listing his ...

You’ll have to boast a particularly robust bank account to nab billionaire Bill Koch’s newly listed wintry Colorado retreat.

Now, it appears that billionaire Bill Koch, sibling of Tea Party darlings David and Charles, has purchased the home for $19.5 million through an LLC, according to celebrity real estate blogger The ...

Billionaire Bill Koch has listed his 52-acre Aspen retreat ... Listing agent Steven Shane told the Denver Business Journal ...