Does this Arboretum Rooftop Building exist? In Uchouten Kazoku, episode 06, there is this scene. Does this building exist?
The actual rooftop garden does not seem to exist, but there is a likely model for this building, which is located northwest of this temple.



It seems to be a private building this is a school that teaches Ikebana/華道. It's likely this rooftop area is not open to the public. This seems to be the closest match to the building depicted in the anime.