Gate City Osaki

Opened in February 1999 at Osaki Station's east exit, this twin-tower complex — East Tower at 108.8 m and West Tower at 98 m — was 15 years in the making and became a cornerstone of Osaki's transformation into a major business subcenter.

Use

Office tower

Area

Shinagawa City

Completed

1999

Floors

24 above ground, 4 below

Height

109 m

Developer

Osaki Station East Exit District 2 Urban Redevelopment Association (managed by Mitsui Fudosan)

Architect

Nikken Sekkei

Fifteen Years to the Finish Line

Step out of Osaki Station’s east exit and two towers frame the view. Gate City Osaki — East Tower (108.8 m, 24 floors above ground) and West Tower (98 m, 24 floors above ground) — opened on 10 February 1999 after a development process that began in 1984 with the establishment of a preparatory association. Designed by Nikken Sekkei and built by a joint venture including Kajima, Mitsui Construction, Toda, Maeda, and Sumitomo Construction, the project carried a total development cost of approximately 160 billion yen.

The timeline spans one of Japan’s most turbulent economic periods. The planning was underway when the bubble economy collapsed in the early 1990s, forcing repeated revisions. That Gate City Osaki was completed at all — and at its original scale — is a testament to the persistence of both the redevelopment association and Mitsui Fudosan, which has managed the complex since opening.

How Osaki Became a Subcenter

Gate City Osaki was not built in isolation. Alongside the two office towers, the development included Gateity Plaza (retail, basement to upper floors) and South Park Tower, a 20-storey residential building on an adjacent lot. The package — offices, shops, and homes in one place — provided the density needed to seed a genuine urban subcenter at what had been a quiet railway stop.

The East Tower is perhaps best known as the long-standing home of Lawson’s headquarters. The stepped silhouette of both towers, blending octagonal, rectangular, and cross-shaped segments, was partly a response to aviation height restrictions, giving the complex a distinctive roofline without sacrificing floor area. Today, Osaki ThinkPark Tower and other projects nearby have extended what Gate City Osaki began.

Summary

Gate City Osaki opened in February 1999 after 15 years of planning, comprising two towers of 24 storeys — East at 108.8 m, West at 98 m — designed by Nikken Sekkei. The 160-billion-yen redevelopment anchored Osaki’s rise as a business subcenter in southern Tokyo. Walk the east exit plaza to see how a single project can reshape the character of an entire station district.

Related buildings: Osaki ThinkPark Tower / Park City Osaki

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