My wife and sold our house in the country and bought an old Studebaker dealership in town.
http://www.jsonline.com/news/wauk/nov02/93020.asp
We razed the roof and erected a spancrete deck on which we built our residence.
The main floor has a 1200 sq ft glassed in showroom, a parts room that we converted to my office. 5000 sq ft of shop space complete with 2 wash bays, a lift and body shop.
Our priority is to complete the residence and get moved in by the end of the month.
Then I can concentrate on finishing the "shop" and get back to playing with cars!
Watch for it on HGTV "Building Character"