Memories are funny things.
So is the passage of Time, to an Acanthus.
What Crowley flourishes is far from what Crowley remembers. This isn't the same Sanctum that five claimed and nourished. The fact that he doesn't even realize the roof has collapsed and made all but the bottom floor unusable is only testimony to how little time he himself has put in.
Sorry to butt in, but I DID try to point this out privately. 2 Dots is all this Sanctum has for Size, and narration needs to reflect that. A large apartment or small family home; 3-4 rooms -- Given the MASSIVE footprint of the building, this is at most a single floor.