Japan Sustainable Building Database

Project Outline

Housing classrooms, this structure was rebuilt as part of Keio University’s 150th anniversary celebrations. The design brief emphasized two key points—the facilities would cater to some 10,000 students at peak times and should serve the university for at least 50 years. Hence, the design has a straightforward structural presence. A gentle approach lined with cherry blossom trees links campus to town; the large roof and louvers facing the approach avenue connect building and environs; while students pass to and fro through the approach junction and atrium.
The interior and exterior common spaces incorporate systems that utilize natural energy sources and capitalize on the site’s approximately 9m difference in elevation between lowest and highest points to provide a diverse space for students. The combination of atrium, rooftop courtyard and innovative classroom layout protects the 35 large and small learning spaces from noise and afternoon sun, providing a constant flow of fresh air through the atrium to the classrooms.
Removal of an 8m-high concrete retaining wall from above the adjoining main road and resultant 180m-long open space is a scenic plus for the town. By incorporating concrete and other materials from the previous building in the external cladding, a new relationship with the building’s surroundings was built on traces of the past.

Basic Information

[CASBEE rank]	S  ()
[CASBEE tool used]	CASBEE-Yokohama(2007 edition)
[Location]	4-1-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, Japan
[Completion date]	March, 2009
[Site area]	352,357m2
[Total floor area]	18,399m2 (the portion added during this project)
[Structure]	Steel-reinforced concrete / steel / reinforced concrete
[Floors]	1 basement level / 6 floors above ground
[Owner]	Keio University
[Designer]	KAJIMA DESIGN http://www.kajima.co.jp/tech/kd/index2.html
[Contractor]	Kajima Corporation Yokohama Office

Information for visitors

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Publication

N/A

Awards

• 51st BCS (Building Contractors Society) Prize
• 54th Kanagawa Architecture Competition Second Award
• 2009 Good Lighting Award (Illuminating Engineering Institute of Japan)