Starbucks just opened its biggest store yet. Take a look inside the Tokyo Reserve Roastery, designed by Japanese architect Kengo Kuma. Liz Muller, chief design officer at Starbucks… Kengo Kuma designed the four-storey building, which has timber fins jutting out from its facade to accommodate balcony terrraces. The Tokyo Roastery was built “from the ground up,” in collaboration with Japanese architect Kengo Kuma; the coffee cask is the largest Starbucks Roastery cask ever, at 55 feet tall.