Sumitomo Fudosan Mita Twin Building

A pair of office towers completed in 2006 by Sumitomo Fudosan on the Mita–Shibaura boundary in Minato City. The 43-story west tower (179 m) and 17-story east tower (86 m) were known together as the Mita Twin Building until a 2024 renaming retired the 'twin' designation.

Use

Office tower

Area

Minato City

Completed

2006

Floors

43 above ground, 2 below

Height

179 m

Developer

Sumitomo Fudosan

Twin Towers on the Mita–Shibaura Boundary

In 2006, two office towers completed in quick succession on the boundary between Mita 3-chome and Shibaura 4-chome in Minato City. The west tower of the Sumitomo Fudosan Mita Twin Building stands in Mita 3-chome at 43 stories (basement 2) and 179.3 meters. The east tower, located in Shibaura 4-chome, rises 17 stories (basement 1) to 85.5 meters. Both were developed by Sumitomo Fudosan as a unified commercial real estate project, together forming what became known as the Mita Twin Building.

The two buildings, while geographically close, sit within quite different urban contexts. The west tower’s Mita 3-chome address is near the Keio University campus and belongs to an established business district on higher ground. The east tower’s Shibaura 4-chome address is part of the reclaimed waterfront zone that has gradually transitioned from industrial use to office development since the 1990s. The contrast — historic inland Mita against the newer bay-side Shibaura — is compressed into a short walking distance.

The west tower’s 179-meter height made it a significant landmark in the southern Minato City skyline at the time of its completion, contributing to the cluster of tall office buildings that has grown around Tamachi Station over the decades.

A 2024 Renaming: The End of “Twin”

In 2024, both towers underwent a formal renaming. The west tower became Sumitomo Fudosan Tokyo Mita South Tower; the east tower became Sumitomo Fudosan Mita First Building. With the name change, the shared “Twin Building” designation disappeared from official use.

The renaming reflects the practical reality that these two towers are quite different from each other: a 43-story, 179-meter tower and a 17-story, 86-meter building share little beyond proximity and a developer. Their addresses span two different district names — Mita and Shibaura — and their scale difference makes the “twin” label somewhat misleading in any case. Giving each building a distinct identity better serves tenants and visitors trying to navigate between them.

The buildings themselves remain unchanged. Walking from Tamachi Station toward Mita, both towers are still visible within a short distance of each other. The “Twin Building” name belongs to the record of this block’s early 2000s development history.

Summary

The Sumitomo Fudosan Mita Twin Building comprised two office towers completed in 2006: a 43-story, 179-meter west tower in Mita 3-chome, and a 17-story, 86-meter east tower in Shibaura 4-chome. Developed by Sumitomo Fudosan, they were renamed in 2024 as Sumitomo Fudosan Tokyo Mita South Tower and Sumitomo Fudosan Mita First Building, respectively — retiring the “twin” designation from official use. Walking the Tamachi–Mita area with the name change in mind is a reminder of how office buildings accumulate and shed identities as the city around them keeps changing.

Related: NEC Headquarters / msb Tamachi

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