Article source: Nikken Sekkei Ltd

The Shinjuku Sumitomo Building was built in 1974 in Tokyo’s Nishi Shinjuku district. The site’s expansive “Sankaku Hiroba” (triangular plaza) atrium roof, along with associated renovations, offer a sustainable model for addressing an emerging problem for Japan’s cities: how to carry out renovation projects on large-scale buildings using good maintenance practices. The project also represents a greater societal effort to enliven the urban business district and enhance its value as an accessible gathering place.

Image Courtesy © SS

• Architects: Nikken Sekkei Ltd
• Project: Shinjuku Sumitomo Building
• Location: Shinjuku-ku, Tokyo Japan
• Photography: Harunori Noda\Gankohsha, SS
• Client, basic plan, and general supervision: Sumitomo Realty & Development Co., Ltd.
• Basic design, construction drawings, and supervision: Nikken Sekkei Ltd.
  
• Construction drawings and supervision: Taisei Design Planners Architects & Engineers
  
• Construction: Taisei Corporation
• Site area: 14,446㎡
• Total floor area: 180,195㎡, including atrium (6,700㎡)
• Floors: 4 basements, 54 above ground (3 mezzanine)
• Maximum height: 211.35m
• Structure: Steel, reinforced concrete, steel-reinforced concrete
• Construction period: Apr. 2017–Jul. 2020

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