His home has the look of the "earthship" design. The houses main building material are dirt rammed car tires stacked w/ rebar inside. It creates a thermal mass that absorbs heat from the sun and releases it in the house at night. One side of the house is earth protected and the other side is all windows. It's said they are pleasant in summer without much a/c cooling needed.
It sounds hideous, but once you're finished construction you never see the tires.
http://en.wikipedia.org/wiki/Earthship

I'd like to see what kind of homes the employees, who aren't millionaires, live in.

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