@reyjinn,
You might want to consider picking up a throwaway commlink that no one knows the number of, that you never use for talking with contacts, etc. to leave running when you're in polite company. Otherwise, Breeze stands out because of his paranoia. Not many people walk around without a comm, after all, so should anybody be looking, he'll pop out immediately.
@Poindexter,
You know that the hellhounds patrol various levels on various days -- never the ground floor for obvious reasons -- as whenever you were scheduled to clean the Magical Studies Department there was always a floor off limits for safety reasons. There didn't seem to be much rhyme or reason to what floor was barred at any particular time, though sometimes it would be the same floor for a few days to a week at a time -- usually the third or fourth. During those times, you heard other janitors complain that they would be forced to come in and clean during a day shift between classes and office hours. This was a major pain in the ass, as they'd have to work faster than usual and would be kept to the same cleaning standards.
You also think that you can provide adequate floor plans of the facility from memory -- we'll run some memory tests and I will provide images for you and the team to use. Whenever you'd like, just run one memory test for each floor you'd like plans to 1-5. The roof is off limits, as you wouldn't have had any reason to be up there.
As for the astral security, you know that the vast majority of spirits and barriers on premises are largely the work of TAs and graduate students. As such, they tend to be of, let's say "varied," strength. They're usually the result of a midterm or final assignment, so a lot of care has been put into them, but they are by no means all done by students of equal skill.