Aww man, I was hoping you were gonna share what you learned with us. Too bad it was ripped from you as soon as you left, sounds like it wasn't a soft landing.
You know there could have been a sleeping security dog in the grounds and you guys didn't even whistle first to check?
The dog would have died of malnutrition some years ago!
Shame that's terrible but true - I look forward to more of your urban adventures, can't believe these places are just left to rot away.