Billionaire David Koch owned at least $143 million of real estate in NYC, the Hamptons, Aspen, and Florida.

The house was built in Midtown in 1923 and designed by noted society architect Addison Mizner.

David Kochs Palm Beach Estate – El Sarmiento (Photo –




Billionaire conservative mega-donor David Koch died at age 79 on August 23, 2019, in Southampton, NY.

The late Koch Industries co-owner was worth an estimated $58.7 billion when he died (per Bloomberg). Most of Koch’s wealth stemmed from his 42% stake in Koch Industries, the industrial conglomerate with an annual revenue of about $110 billion, according to Forbes.

Known for his hefty donations to conservative political causes, Koch had a massive real-estate portfolio in New York City, the Hamptons, Aspen, Colorado, and Palm Beach, Florida.

According to calculations by Business Insider, Koch’s real-estate holdings are worth at least $143 million (based on sale prices and Zillow estimates).

Business Insider took a look at David Koch’s known real-estate holdings, from his $40 million Manhattan townhouse to his $18.8 million oceanfront Hamptons mansion.


Architectural historian Augustus Mayhew tells it, the house was originally a beach house for the Duke-Biddle family.
David Koch’s Palm Beach Mansion, El Sarmiento – This shows the complete home once all three houses were moved and joined together.


Related: Palm Beach Homes – The Mansion of David and Julia Koch





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