Biosphere 2, the self-contained, self-sustaining world-in-a-bubble built to support ecological research has been sold for $50 million to CDO Ranching & Development along with the 1658 surrounding acres.
Biosphere 2 in Pinal County north or Tucson failed to generate the level of interest necessary to sustain it on it's own.
The plan is to build 1500 homes and a resort hotel on the property.
Read it HERE and HERE and HERE