"You see these in every city; how many apartments, like ours in Hell's Kitchen, had a fireplace mantlepiece but no fireplace? Semi-blocked doors, walled-off terraces, connecting passageways of an old large house blocked off to make two smaller houses, staircases deprived of their entryways, all common sights. And while I enjoy all the mystical connotations of these, they also kind of make me sad; poor abandoned things. And also a little annoyed at what, most of the time, is just poorly-done renovation work."
ADDED: Wisconsin Law School old-timers remember — before the renovation — there was a short stairway near the library that ended in a bit of floorspace just big enough for the old sofa someone put there. Above it was a sign that read "Reality Checkpoint."