Hoagland Hall Annex, or just The Annex is where the graduate students in Atmospheric Science live used to live, though they've now moved upstairs. It's essentially a garage converted into offices, which explains why they moved out. The Biometeorology Group definitely had the best room, as it's the only one where the air conditioner really works in the Summer.
Rumor has it that the Art Department will be taking over the space, which is way across campus from most of its offices.
It also has a workshop associated with DANR on the west side.