Why did major Japanese corporations maintain offices in Tokyo’s Marunouchi district?

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Tokyo-Yokohama Metropolitan Area Portion of the Tokyo skyline at dusk; Tokyo Tower is at the right.

Major Japanese corporations maintain offices in the Marunouchi district primarily due to its proximity to government offices. This strategic location facilitates close interaction between corporate management and government bureaucrats, a relationship that has long been a defining feature of the business landscape in the Tokyo-Yokohama Metropolitan Area.1

The district itself was developed by Mitsubishi enterprises, which transformed vacant land near the Imperial Palace into a central business hub during the Meiji period. Today, Marunouchi serves as a major center of Japanese business activity and is widely considered the proper corporate location for large firms, even those that maintain their primary manufacturing facilities elsewhere.231