Texas billionaire Ed Bass spent more than $200 million (147 million EUR) building Biosphere 2 near Oracle. The site attracted global attention in 1991, when eight people were sealed inside to conduct a two-year experiment in self-sufficiency.
The buyer, CDO Ranching & Development, L.P., said the 3.1 acre (1.25 hectare) building will remain open to researchers and tours for now. The sale was announced Monday by Jerry A. Hawkins, vice president of real estate firm CB Richard Ellis Tucson.
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