I was shooting here with a friend last week, and as we were in the middle courtyard area (completely surrounded by the building on all sides) a man came around the corner holding a hacksaw. He was in his twenties and we scared him as much as he scared us, but he was cool. We briefly exchanged words and then we left, and didn't see where he went.
Be careful in here. There was a meth lab bust back in the summer of 2010 here.