A road has its own structure inside the tower
At Osaka’s Gate Tower Building, the Hanshin Expressway occupies the space between the fifth and seventh floors. The surprising part is that the road and office tower are not holding each other up: the expressway is carried by its own supports, while the building’s frame is designed around it. The highway passes through an enclosed section, rather than exposing office floors directly to traffic.
That separation is the key to making the arrangement workable. It lets the road continue along its planned route without turning the building into a bridge for passing vehicles. For people inside, the highway floors are not ordinary office space; the building’s elevators pass them on the way to floors above.
A compromise built into the plan
The unusual layout came from a clash between two uses of the same urban site: a highway route and a development project. Rather than treating the land as exclusively for one or the other, planners and developers worked out a design that could accommodate both. The result is a visible record of negotiation made permanent in concrete and steel.
From the street, the expressway appears to slice through the tower. Structurally, though, it is closer to a neighboring elevated road threaded through a building-shaped shell. That distinction is what makes the scene more than an architectural stunt: traffic can keep moving through a dense city block while offices rise above it.
