Commercial Block Connected by Skybridges: Elevated Walkways and Street Separation

Design a downtown commercial district in the manner of John Portman where the pedestrian realm is lifted entirely off the street into a network of enclosed glazed bridges spanning between towers at third-floor level. Compose several tubular sky bridges crossing above an empty roadway, blank concrete tower bases below with no shopfronts, cars passing beneath, mirrored glass shafts rising on both sides, flat overcast light, low view up the street through the bridges, 24mm lens, architectural photography, ultra photorealistic, 8K