Billionaire Bill Koch Lists His Cape Cod Home, Formerly Owned By The Mellon Family, For $24 Million

Energy magnate Bill Koch‘s latest real estate listing, a Cape Cod waterfront estate for sale at $23.85 million, is a testament to having friends in high places. 

Among Koch’s rarified acquaintances were banking heir Paul Mellon and his wife, Rachel “Bunny” Mellon, the renowned gardener whom Koch met when he first visited Cape Cod in the 1970s. It is their former home, which Koch has put up for sale, according to The Wall Street Journal.  

The two power couples often socialized at the Mellons’ home in Osterville, Massachusetts. A year before Bunny died in 2014, and 14 years after her husband passed, Koch purchased the Mellons’ 26-acre waterfront estate for $19.5 million. 

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Homes From The Mellons And Du Ponts

With a net worth of over $2 billion, according to Forbes, Koch hardly needs the money from the sale, but having also purchased the 10-acre estate from the du Pont family for an undisclosed sum in 2014, he used that as his primary residence and the Mellons’ former home — comprising an eight-bedroom main waterfront home, and two two-bedroom cottages — as a “beach house.” 

The cottages were used as an artist’s studio, a greenhouse, and the main house for his guests.

“My main Cape home is next door—it is plenty big for my friends and family now,” Koch, the founder of petroleum coke and sulphur products manufacturer Oxbow Carbon, told the Journal. “It is time for someone else to enjoy this marvelous property.”

Koch, who also owns a vast estate in Aspen, Colorado, currently on the market for $125 million, a ranch in Paonia, Colorado, as well as a Palm Beach, Florida, compound, is not one of the two brothers that come to mind when most people think of the Kochs. Those would be his siblings Charles and David, major contributors to the Republican Party during the Bush years and with whom Bill had a legal battle after selling his shares of the company in 1983.

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Vast Swathes Of Pricey Cape Cod Real Estate

According to the Journal, Bill Koch owns 32 acres of land in Cape Cod and is selling several other parcels in conjunction with the former Mellon home, all of which are located in the Oyster Harbors gated community, an island accessible only by boat.

Koch has been actively divesting his luxury real estate portfolio over the past few years. In addition to listing his Aspen estate last year, the Journal reported that he listed roughly 11 acres of the Mellon estate in 2023 for $16 million and has also listed a smaller 1.75-acre parcel, which contains an approximately 3,700-square-foot house and a dock.

A 7,800 Christie’s Wine Auction And Coveted Art Collection

An avid wine and art collector, Koch recently auctioned 7,800 bottles of wine at Christie’s. He is also an art collector, as was the late Paul Mellon, who transferred his art from Virginia to the Cape, enjoying the pieces rather than keeping them in storage. 

“He had some of the world’s greatest masterpieces,” Koch told the Journal. “I always wanted a Van Gogh, and he knew it, and would always — with just a touch of smugness— steer me into the room where it hung,” he said. “He taught me how to live with fine art in a wonderful, intimate way. My neighbors up here can thank him for their views of the Botero bronzes on my lawn.” 

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