I Garden Air

A mixed-use office district completed in 2003 on the site of the former Iidamachi freight yard. The centerpiece Garden Air Tower rises 35 floors and approximately 153 meters, developed by Japan Freight Railway — a rare case of a logistics operator leading its own urban redevelopment.

Use

Office tower

Area

Chiyoda City

Completed

2003

Floors

35 above ground, 2 below

Height

152.6 m

Total floor area

approx. 93,154 m²

Developer

Japan Freight Railway (JR Freight)

Architect

Nikken Sekkei

A Glass Tower on Former Freight Ground

In Iidabashi, Chiyoda City, a cluster of high-rises stands where freight trains once ran. Garden Air Tower — 35 stories above ground, two basement levels, and a total height of 152.60 meters — is the centerpiece of the I Garden Air development district. Completed in 2003 and designed by Nikken Sekkei, with a total floor area of 93,154 square meters, it is one of the most significant office developments to emerge from a freight infrastructure site in Tokyo.

The land was previously occupied by Iidamachi Freight Station, a terminal that had served the capital’s cargo logistics since the early years of Japanese rail. As freight shifted progressively away from rail, the station’s role diminished and cargo operations were wound down in 1999. Japan Freight Railway (JR Freight), now holding a broad stretch of centrally located land, chose to take on the role of urban developer itself — an unusual step for a logistics operator, and one that reflects how rail companies have been reimagining their real estate assets across Japanese cities.

When a Rail Company Builds a City Block

I Garden Air was designed not as a single building but as a compound. Alongside Garden Air Tower, the Daiwa House Tokyo Building (23 floors) shares the site, forming a unified district around shared greenery and open plazas. The construction of Garden Air Tower was carried out by a joint venture of five major contractors: Kajima, Shimizu, Tekken, Taisei, and Kumagai Gumi. The breadth of that consortium reflects the scale of the undertaking and the ambition behind it.

Iidabashi’s location is a compelling asset. In addition to the JR Chūō–Sōbu Line, four subway lines — the Tokyo Metro Yūrakuchō, Tōzai, and Namboku lines, together with the Toei Ōedo Line — converge at Iidabashi Station, making the district accessible from much of central Tokyo. What was once a node for the movement of goods has been remade as a node for the movement of people and ideas.

Summary

I Garden Air was completed in 2003 in Iidabashi, Chiyoda City. Garden Air Tower, designed by Nikken Sekkei, stands 35 floors and approximately 153 meters tall, developed by Japan Freight Railway on the site of the former Iidamachi Freight Station. Walking through the district today, it is worth a moment to consider what once occupied this ground — and how a logistics footprint became an urban address in the heart of Tokyo.