Many thanks, Del.
In my case, it was four discrete buildings. I didn't live in it. (I lived in a bloody castle tower!) So I can't remember to what extent the buildings communicated at the corners. Maybe there was just a sidewalk between them. But they did overlap, so they were not just corner-to-corner. Sorry, no picture. 
But when we said, "I'm going down to the quad," we were usually speaking more about the buildings than about the enclosure.