Marunouchi OAZO

A five-building mixed-use complex completed in 2004 in front of Tokyo Station's Marunouchi North Exit. Rising to approximately 159 meters at its tallest point, it replaced the former Japan National Railways headquarters site and helped reshape the north side of Tokyo's premier business district.

Use

Office tower

Area

Chiyoda City

Completed

2004

Floors

29 above ground, 4 below

Height

158 m

Developer

Mitsubishi Estate, Nippon Life Insurance, Chuo Real Estate

Architect

Mitsubishi Jisho Sekkei, Nikken Sekkei, Yamashita Sekkei

Five Buildings Reshaping the North Side of Tokyo Station

Step out of Tokyo Station’s Marunouchi North Exit and a cluster of towers fills the view directly ahead. This is Marunouchi OAZO, which opened in September 2004 as one of the pivotal early projects in the transformation of the Marunouchi district. The complex comprises five components: the Nippon Life Marunouchi Building (29 stories, approximately 159 meters), the Marunouchi North Exit Building (29 stories, approximately 147 meters), Marunouchi Hotel (17 stories), Shin-Marunouchi Center Building, and Marunouchi Center Building. The project was developed jointly by Mitsubishi Estate, Nippon Life Insurance, and Chuo Real Estate, with design handled by Mitsubishi Jisho Sekkei, Nikken Sekkei, and Yamashita Sekkei.

The site carried significant historical weight. It had been home to the headquarters of Japan National Railways, the predecessor of the JR companies, along with the former JR East headquarters building and the Japan Travel Bureau Building. When the national railway system was broken up and privatized in 1987, it set off a long chain of events that ultimately led to this land moving into private redevelopment. Marunouchi OAZO, opening seventeen years after privatization, was one concrete result of that transformation.

A Vertical City You Can Walk Through

The five buildings of Marunouchi OAZO are not simply placed side by side. They connect from basement to upper levels through overlapping passageways, atria, and shared circulation routes, encouraging visitors to move through the complex rather than simply enter and exit a single tower. A dramatic top-lit atrium at the center of the development breaks the usual sealed-box feeling of large commercial buildings and creates a moment of spatial surprise in the middle of the block.

Maruzen, one of Japan’s most storied booksellers, occupies a large floor area within the complex and has become one of its defining presences. Its inclusion reflects the cultural dimension that Mitsubishi Estate brought to the Marunouchi redevelopment — offices and shops, but also a place where books, ideas, and the district’s knowledge workers could meet.

Summary

Marunouchi OAZO, completed in 2004 as a five-building complex reaching approximately 159 meters at its tallest, stands in front of Tokyo Station’s Marunouchi North Exit as an early landmark of the district’s transformation. Built on the former JNR headquarters site, it brought offices, hotels, retail, and a flagship bookstore to a corner of the city long defined by rail administration. Exit the Marunouchi North Exit, look north, and the story of how Tokyo’s premier business district reinvented itself becomes visible in a single glance.

Related articles: Marunouchi Building / Shin-Marunouchi Building

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