Gate Tower Building (ゲートタワービル gēto tawā biru?) is a 16-story office building in Fukushima-ku, Osaka, Japan. It is notable for the highway that passes through the building. It has been nicknamed “beehive” referencing its appearance as a “bustling place”.
The building has a double core construction, with a circular cross section. The Umeda Exit of the Ikeda Route of the Hanshin Expressway system (when exiting the highway from the direction of Ikeda) passes between the fifth and seventh floors of this building. The highway is the tenant of those floors. The elevator passes through the floors without stopping: floor 4 being followed by floor 8. The floors through which the highway passes consist of elevators, stairways and machinery. The highway does not make contact with the building. It passes through as a bridge, held up by supports next to the building. The highway is surrounded by a structure to protect the building from noise and vibration. The roof has a helipad.
For that reason, the highway laws, city planning laws, city redevelopment laws and building codes were partly revised in 1989 to permit a so-called Multi-Level Road System (立体道路制度 rittai dōro seido?) that allows the unified development of highways and buildings in the same space. This system was originally designed to facilitate the construction of the second Ring Road in the vicinity of Toranomon, Minato-ku, Tokyo, but in the end was not applied there. Instead, the system was put into effect in the construction of the Gate Tower Building, becoming Japan’s first building to have a highway pass through it. Normally, highways are still built underground in these cases, and passing through a building is an extremely rare occurrence.