Osaka Prefectural Government Sakishima Building

Nankō-kita, Japan

Exterior only

Visible from the street; the inside is private.

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Completed in 1989 in Osaka's Nanko Cosmo Square near the harbor, the Osaka Prefectural Government Sakishima Building—also known as Cosmo Tower—is a 256-meter modern skyscraper designed by Mancini•Duffy and Nikken Sekkei. The third tallest building in Osaka and sixth in Japan, it features three basement levels and an array of amenities including a museum, restaurants, office space, a conference room, and a skylobby. Its distinctive inverted pyramid observation deck crowns the structure. The building serves as the working office for the governor of Osaka Prefecture and until 2023 was known as the Osaka World Trade Center Building.