INSIGHTS

2021.12.10

Mitsubishi Jisho Design Smart City

Otemachi Building
– Smart Renovation

Utilization, preservation and revitalization of existing stock

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Otemachi Building

Data

Project name

Otemachi Building
Year of completion

1958
Renovation period

Late May 2018 - May 2022
location

1-6-1 Otemachi, Chiyoda-ku, Tokyo
Uses

Offices, stores, parking lots
Site area

10,496 m²
Total floor area

111,272 m²
Floor number

9 floors above ground/3 floors below ground
structure

SRC Construction

Project Overview

The Otemachi Building, which turned 60 years old in 2018, is undergoing a large-scale Renovation positioned as a "challenge to become a 100-year-old building." In addition to renovating facade using a variety of materials to improve environmental performance, the interior has also been renovated to a design that is more acceptable to startup companies while still making use of good old materials. In the future, the rooftop plaza will be renovated to become an urban oasis filled with greenery covering an area of approximately 4,000 m2.

While large-scale redevelopment methods such as rebuilding are often chosen for old buildings in large city blocks, the Otemachi Building has been designed to utilize its existing space, taking advantage of its low-rise, many pillars, and long corridor structure, making it possible to meet the demand of startup tenants, mainly small offices. Utilizing existing stock in this type of city center can be considered a regeneration method different from large-scale redevelopment.

When it was completed in 1958, Otemachi Building was one of the top 10 buildings in the world, and even today, it is used as a highly convenient facility in terms of infrastructure and the flexibility of public spaces. Even back then, the idea of what we now call a smart building or smart city was in the cards, and it can be said that Renovation provided the building with the capacity to continue to be used in the present and future. A sustainable society needs to be built using a variety of methods. At the same time, a smart city is not something that can be built once and then finished. This project is an example of an attempt to achieve this through stock utilization and Renovation.

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Update : 2021.12.10

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