Small Box House by Akasaka Shinichiro Atelier (via Dezeen)this bit from the Atelier is wonderful:
From the casual lifestyle of the client and his wife, and also the request to have a part of the house turn into a cafe in the future, we aimed to create a space to be flexible to support events, such as the new birth of a child and opening a new cafe, where various life-scenes existing with reasonable distances to each other inside a simple void, like a barn.
more here