Green Space Area
The percentage of green area is 43%. Out of 4.7ha (2003 data) of all rooftop green areas in Chiyoda-ku, its rooftop green area accounts for 5.5% of it.
|Construction completed||March 1984|
|Rooftop green area||2,614m2|
|Ground-level green area||2,561m2|
The soil depth of rooftop green is 1m on average, with 1.5m for areas with tall trees and 0.6m for areas with shrubs respectively. To maintain aggregate structure of soil long-term, the soil consists of Fuji sand and Kuroboku soil at 3:7 ratio with bark-type compost fertilizer worth 10% of its volume, allowing for good air and water permeability. This means plants survive mostly on rain water. The remaining rain water is used for toilets. To support this soil structure, the load capacity of the building is 2,000kg/m2 on average.
Heat Island Mitigation
The surface temperature of green spaces is more than 20°C lower than that of highways and rooftops of surrounding buildings, contributing to mitigating the heat island effect.
Cooling down rooftops
We cooled down the upper rooftop of Surugadai Building by applying high-reflectivity coating on it. Cooling down the rooftops largely lowers the rooftop surface temperature, thereby helping to mitigate the Tokyo Heat Island effect.
Awards and Prizes
1993Urban Landscape Award (Director of Chiyoda Ward)
2001Green Achievement Award (Minister of Land, Infrastructure and Transport)
2004Green Rooftop Award (Minister of Environment) :News Release Mitsui Sumitomo Insurance Co., Ltd. Oct.22, 2004
2005SEGES (Urban Green Space Development Foundation) :News Release Mitsui Sumitomo Insurance Co., Ltd. Apr.28, 2005
Sustaining accreditation of highest rank achievable: Excellent Stage3
|NHK General TV Good morning Japan||Apr.8, 2005|
|Nippon TV Unexpected Stopover Trip||Sep.30, 2006|
|Tokyo TV Chie no Wa||Oct.1, 2006|
|Fuji TV Meza nyu-||Nov.22, 2006|
|Nippon TV Omoikkiri TV||Dec.19, 2006|
|NHK General TV Newswatch 9||May 4, 2007|
|BS Asahi Happy! Lohas||May 4, 2007|
|Yomiuri Weekly||Jun.19, 2005 issue|
|Nihon Keizai Shimbun||Sep.28, 2005 evening edition|
|AERA||Oct.31, 2005 issue|
|SPA Weekly||Oct.17, 2006 issue|
|Yomiuri Shimbun||Nov.18, 2006 evening edition|
|Shincho Weekly||Dec.1, 2006 issue|
|Croissant separate issue||Mar.10, 2007 issue|
|Asahi Shimbun||May 8, 2007 evening Edition|
|TBS Radio Kyokei Arakawa's Day Catch||Oct.16, 2006|