"Vertical Metropolis: How Shanghai Is Reinventing the 21st Century Cityscape" Shanghai's Urban Canvas in 2025Demographic & Spatial Facts:- Population: 29.7 million (4.2 million expats)- Built-up area: 6,340 km² (32% green space)- Average building height: 87 meters- Underground city: 42 million m² developed- Vertical farms: