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The video suggests these cars are probably being built in Tesla's factory - the white-painted walls and red-painted machinery are pretty unique to Tesla. See https://www.youtube.com/watch?v=CqSDWoAhvLU#t=58

(Also note that "Rotary Lift", the brand seen at that point in the video, is the exclusive supplier of vehicle lifts to Tesla - http://www.prnewswire.com/news-releases/tesla-motors-chooses...)

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The NYTimes reported that they'll be built in Detroit;

"Google is having 100 cars built by a manufacturer in the Detroit area, which it declined to name. Nor would it say how much the prototype vehicles cost. They will have a range of about 100 miles, powered by an electric motor that is roughly equivalent to the one used by Fiat's 500e, Dr. Urmson said. They should be road-ready by early next year, Google said."

They could have used Tesla's facilities for the first prototypes though. My money for the first production run is on a niche house like Roush, or potentially Chrysler since these little cars share components with the Fiat 500e.

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