Hirakawacho Mori Tower

A 24-story, 102-meter office tower completed in December 2009 in Hirakawacho, Chiyoda City. Developed and designed by Mori Building, it stands close to the National Diet Building in Tokyo's governmental district.

Use

Office tower

Area

Chiyoda City

Completed

2009

Floors

24 above ground, 2 below

Height

102 m

Developer

Mori Building Co., Ltd.

Architect

Mori Building Co., Ltd.

A Quiet Tower in Tokyo’s Governmental Heart

Hirakawacho sits between the busy commercial energy of Akasaka and the hushed corridors of power around Nagatacho. Completed in December 2009, Hirakawacho Mori Tower rises 24 stories and two basement levels, reaching approximately 102 meters above a neighborhood more accustomed to ministry buildings and political party offices than tall commercial towers. Mori Building both developed and designed the project, adding a mid-sized entry to its portfolio of Tokyo towers alongside better-known landmarks like Roppongi Hills Mori Tower and the ARK Hills complex.

The building is primarily occupied by offices, with limited commercial space at the lower levels. Its location gives it access to multiple Tokyo Metro lines—Hanzomon, Yurakucho, and Namboku lines converge at Nagatacho Station nearby, as does the Yurakucho and Namboku lines at Ichigaya. For businesses that need to be close to the Diet, government agencies, and financial institutions, the address carries weight.

Mori Building Beyond Minato City

Mori Building’s most visible projects cluster in Minato City—Roppongi Hills, Toranomon Hills, Azabudai Hills—but the company has also developed towers in Chiyoda and other central wards. Hirakawacho Mori Tower represents that quieter side of the developer’s portfolio: a single-building project in a neighborhood with a distinct, subdued character rather than a large-scale integrated district.

The surrounding streets are worth exploring on foot. Hirakawacho’s low-rise sections retain a mix of prewar-era land parcels and narrow lanes that have survived multiple cycles of urban change. The view from the tower’s vicinity—the Imperial Palace moat and Chidorigafuchi’s cherry trees to the north, the Diet Building’s distinctive silhouette to the west—anchors the building firmly in central Tokyo’s most historically layered district.

Summary

Hirakawacho Mori Tower was completed in December 2009 as a 24-story, 102-meter office tower in Chiyoda City’s governmental district. Developed and designed by Mori Building, it brings a commercial high-rise presence to Hirakawacho, within walking distance of the National Diet Building and the Imperial Palace moat. A walk through this neighborhood offers a compact but telling lesson in how modern Tokyo coexists with the architecture of power.