Mitsui's 36-story Kasumigaseki building was finished in 1968. The actual construction time was just two and a half years, but about ten years were spent on the project from conception to completion.
樓高卅六層的霞關大樓，從一九六五年底開建，六八年中完工，真正興建時間不到二年半，但從有構想到完成約花了十年。