AdvertisementYears before the recent drama at OpenAI turned CEO Sam Altman into a household name, the former Y Combinator president went on an extraordinary 18-month, $85 million real-estate shopping spree, according to records reviewed by Business Insider — including a previously unreported $43 million Hawaii estate on land that locals describe as historically significant. AdvertisementSam Altman's Hawaii estate is immediately adjacent to the reconstruction of the royal temple of King Kamehameha I. Maxar TechnologiesA $43 million estate in HawaiiIn July 2021, Altman bought a twelve-bedroom estate in Kailua-Kona, on the big island of Hawaii, for $43 million. Altman's purchase of the Hawaii property has not been previously reported. AdvertisementAnnie had been unaware that her oldest brother owned property in Hawaii until Business Insider asked her about it, she said. A $27 million San Francisco homeAltman's weekday residence is a home on San Francisco's Russian Hill that was once described — inaccurately — as the most expensive home in San Francisco.

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