Is there a business in your town, which you are 100% sure is a front?

I live in a very rural town surrounded by farms. Just outside the town is a business, but it's completely unmarked and the entire building is painted black. There's a chain link fence all around it, and there's a partition in the middle. Behind the partition you can randomly see just ridiculously nice sports cars, and it's always different ones.

Once we were driving by and saw this really nice lowered sports car randomly stuck in the ditch out front, and it took them at least half the day to get it out.

I'm certain it's a chop shop.