This is "草屋". It means grass house.
Now the scaffolding has been constructed maintenance for the meadow on the roof.
This building is an office of Japanese famous animation studio "Ghibli" and Mr. Hayao Miyazaki try to express the theme of symbiosis of nature and human.
I think it is similar trial as tookapic.com/photos/102074.
I dedicate it for @smash_kasumi as an Architect.