The Space Below: Connecting Transit, People & Tall Buildings

This fourth technical guide in the CTBUH “Space” series examines how tall buildings integrate with the public realm, connect to one another, and link to major transit hubs—particularly through grade-separated, climate-controlled pedestrian walkway systems—while addressing broader urban design questions such as how tall buildings enhance quality of life, function as place-makers, and contribute to social and economic vitality. A key focus is how these buildings engage with streetscapes and pedestrian networks, which in many cities include interior, climate-controlled pathways that link multiple buildings and open spaces, extending public space and enabling year-round interaction in extreme climates. Through 11 case studies, the guide highlights this often overlooked layer of urban infrastructure, revealing the extensive tunnels and bridges that knit city centers together and support vibrant commercial and social activity.