I need some suggestions...

...for what to do in this basement. As you'll see in the picture here, this house sits on top of a basement box. In the basement is three rooms. One of them (at the foot of the stairs from the house) is going to be a laundry room. The room at the opposite end is going to be the caretakers quarters. But for the life of me I can't figure out what to do with the middle room. In the five years since I started this project, I haven't been able to decide what to do. I'm hoping that with twelve followers of this blog, I can get some good suggestions. Help! :)