50-yr old apartment building in Shinjuku to be refurbished

A former luxury rental apartment building in Shinjuku is undergoing a full refurbishment. Rather than follow the standard practice of demolishing and rebuilding from scratch, the 50-year old building will be stripped back to its concrete structure, retrofitted and renovated.

Chatelet Shinanomachi is a 9-story rental apartment building built in 1971. Rebuilding would produce the equivalent of 2,375 tonnes of CO2, while the refurbishment of the existing structure would produce 654 tonnes. Refurbishment also has a shorter construction period and can be done at a lower cost than rebuilding.

Over 80% of the original structure will be preserved in the process. Building certification and completion approval may be also obtained which can help with financing and future resale down the track. Earthquake retrofitting with the installation of reinforcing walls is expected to result in a Seismic Index of Structure (Is) of 0.6. According to the Japan Seismic Diagnosis Association,  an Is of 0.6 or above is the industry standard for most buildings (the Ministry of Education, Culture, Sports, Science and Technology requires an Is of 0.7 or above for public schools, however).

Refurbishment is expected to be completed in March 2022. 


Shinanomachi 3-1, Shinjuku, Tokyo

Source: Mitsui Fudosan News Release, September 22, 2021.

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