Phenomenal shots. Some of 'em really do stir an emotional response, and your post processing has really brought out the abandoned, bleak, chilling feel to them. My faves are 2, 3, 5, 6, and 15.
Just out of interest, were you ever charged? And if so, have the charges now been dropped?
And to those inspired by these shots to go out and explore abandoned buildings, read nealjpage's advice (post 17 above). You might also want to make sure someone who's not with you (and your buddy) knows where you were headed, and check in with them once you're safely out.