The building was part of a project called the City of Air, which planned to interconnect 4 towers. In the end, only 2 towers were built but even so, the result seems to be taken from a sci-fi movie. The deck connecting the towers is a huge observatory called the Floating Garden Observatory, which offers a 360 degrees panorama over the city.
Finished in 1993, the building was designed by Hiroshi Hara, who also designed the Kyoto Station (which I'll be visiting soon).
EXIF info:
Nikon D300
Lens: 8-16mm F/4.5-5.6G
Focal Length: 8mm
Aperture: F/7.1
Shutter Speed: 1/500s
ISO Sensitivity: ISO 200