Harumi Island Triton Square

A large mixed-use redevelopment completed in 2001 on reclaimed land in Harumi, Chuo City, featuring three high-rise office towers — the tallest reaching 45 storeys and approximately 195 metres. Developed by the Urban Development Corporation (now UR), the complex introduced a commercial and public waterfront to an area previously dominated by industrial and warehouse uses.

Use

Office tower

Area

Chuo City

Completed

2001

Floors

45 above ground, 4 below

Height

194 m

Total floor area

approx. 383,300 m²

Developer

Urban Development Corporation (now UR) / Harumi 1-chome District First-type Urban Redevelopment Association

Architect

Takenaka Corporation, Nikken Sekkei, Kume Sekkei

Three Towers on the Waterfront

On reclaimed land in Harumi, Chuo City, three high-rise office towers were completed in 2001 as part of one of central Tokyo’s largest redevelopment projects. Harumi Island Triton Square comprises Tower X (45 storeys above ground, 4 below; approximately 195 metres tall), Tower Y (40 storeys; approximately 175 metres), and Tower Z (34 storeys; approximately 155 metres), together with a lower commercial block. The combined gross floor area across the towers reaches approximately 383,000 square metres. Design responsibility was distributed among Takenaka Corporation, Nikken Sekkei, and Kume Sekkei.

The development was led by the Urban Development Corporation — the predecessor to today’s UR Urban Agency — in partnership with the Harumi 1-chome District First-type Urban Redevelopment Association. Before the project, this stretch of Harumi was characterised by industrial and warehouse buildings typical of Tokyo’s older waterfront districts.

A New Address on the Canal

The planning of Triton Square placed the towers’ bases along a canal promenade, creating a public waterfront that connects the three buildings at ground level. Commercial and retail uses on the lower floors open onto this walkway, while community bus services were established to improve access from the nearest railway stations — a practical response to the relative isolation of Harumi’s reclaimed-land geography.

When Triton Square opened, Harumi had not yet developed the residential character it has since acquired through subsequent condominium projects. In that sense the complex served as an early anchor, demonstrating that large-scale modern development could take root away from the established city centre. The canal-facing promenade, which later residents of the surrounding towers also use freely, remains one of the more pleasant open spaces in the eastern part of Chuo City.

Summary

Harumi Island Triton Square was completed in 2001, with its tallest element reaching 45 storeys and approximately 195 metres on reclaimed land in Harumi, Chuo City. Led by what is now UR Urban Agency, the project transformed a former industrial waterfront into a mixed-use district with a public canal promenade at its heart. Approaching by water bus or walking out along Harumi-dori gives the best sense of the scale of the three towers as they rise above the canal.

For hotels near Harumi and the Tsukiji-Ginza area, Rakuten Travel offers convenient options for visitors to Tokyo’s eastern waterfront.