tl;dr: Hidden behind an unmarked doorway in Barcelona, two coffee businesses share the same small space — one roasting and selling, the other teaching and tasting — but not at the same time. This smart setup, which I called a stacked space, cuts costs, spreads downside-exposure, and promotes urban experimentation and innovation. It’s an emerging pattern you can now spot in Singapore, Tokyo, Manhattan, and Paris … and a kind of urban innovation planners and developers haven’t caught ...
