Well, the one here in Oklahoma was sold to the USAF and is now part of Tinker AFB, the Japanese bought a shitload and moved their operations here so the plant in Arlington TX went from making Fords (IIRC) to Toyotas. So I imagine finding an old assembly building isn't all that easy.
Maybe not out west so much, but in the rust belt I think there are plenty. I know a couple in Ohio that are either available or only a small portion of the factory has been repurposed.
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