Hi again. It's the 2nd part of my my Hogwarts modifications.
The Great Hall set depicts a really nice hall, but I didn't like the tower. So I've changed the tiny chamber with the Mirror of Erised into a fully fledged Dumbledore's office.
The three small turrets. Maybe they do not extend from the middle of the roof, like in the movies, but I wanted them to actually form a part of the office.
The Pensieve, front bookshelves, chair and desk are, obviously, from the Clock Tower set. The extended roof surface provides enough display space for headmaster portraits.