I find this stuff fascinating. Probably helps that AZ has low property taxes:
https://www.thestreet.com/story/14387483/1/bill-gates-buys-land-in-arizona-to-build-smart-city.html
https://www.thestreet.com/story/14387483/1/bill-gates-buys-land-in-arizona-to-build-smart-city.html