https://www.openstreetmap.org/changeset/159467373
I shrunk the mall and split out the building that is separate from it (even though it is attached, they are clearly different properties). I tried to keep the shape of Cornwall relatively intact (though I cannot confirm whether there's a bit of the mall that juts out into the alleyway to the east.)

I'll keep this note open for say a week in case this change ends up being issue-prone. But if noone has problems, I'll close this out.