I work in food service at KI and the building you're talking about is now used as an office and a place to make pretzels. It was closed because of FC's removal. Since there is no serious ride in that area, it is now awful placement for a concession stand.
There is a ghost story about the queue lines for FC. The electricity to that whole queue line area has been cut off, but some people claim that the fans will turn still turn on on their own. I was in the park after a late close at 1:00AM and walked through the queue lines, but the fans didn't do anything.