This is an alley made hospitable to pedestrians (customers!). It connects to parking lots behind these building and provides rear entrances as well as patios for several pubs and restaurants that wouldn't fit in the front along the street. There doesn't seem to be physically much required for this very simple transformation. Paving and lighting, bollards at the far end to prevent cars near the patios. There may have been electrical utility lines that were placed underground. That would be very costly, but is not absolutely necessary. What's the saying? Never let the perfect be the enemy of the good. Use what you've got to make a gradual transformation happen.