The Great Lakes Tech Centre was sold in parts at an auction for nearly $2 million. The complex includes a building from the 1920s and still houses Billy Durant's (GMs founder, 1908) former office.
http://archives.chicagotribune.com/2009/dec/15/news/chi-ap-mi-historicauction-fHere is an article before it was sold, in it a news video that shows some interior and exterior shots of the buildings.
http://abclocal.go.com/wjrt/story?section=resources/auto&id=7171476