Characters: Everyone. Anyone.
Time: After sunrise, Monday
Location: Blackstone Hotel
Content: Disappearance of mystery magic black fog. Oh look, what's behind it? The Blackstone Hotel!
Format: Whatever
Warnings: Cursing, maybe.
With sunrise on Monday, the black fog that had surrounded the Blackstone Hotel and nearby buildings thin, burning off in the cold, bright sunlight. As it burns away, the Blackstone Hotel is slowly revealed, looking exactly like it did before its mysterious disappearance. The only thing that is different is the haphazard piles of rocks that were scattered about the perimeter, as if someone (or many someones) had been hurling rocks at the hotel.
Congratulations, Chicago. You have your hotel back.