The building has a double core construction, with a circular cross section and special care is taken by providing surrounded structure to the highway to protect the building from noise and vibration. Generally expressways are built underground, and passing through a building is an extremely rare occasion. It dates back to 1983, when the redevelopment of this area was decided upon, "building permits were refused because the highway was already being planned to be built over this land. The property rights' holders refused to give up, and negotiated with the Hanshin Expressway corporation for approximately 5 years to reach the current solution."

Now that is a cool concept. Cooler if office workers could see into the highway. Makes for interesting urban renewal concepts.