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6897triirtPhoogaphy｜1–5｜6–7：日建設計／Nikken Sekke｜8：R, ry9：Gerry O’Leachad Bryan1 : As indirect light enters, the curtain wall creates a kaleidoscopic effect.2 : Exterior view of the light court above the main lobby and the exterior of the tower slit.3 : The steel-reinforced unfaced concrete riwaq (arcade) colored with a sandblast finish demarcates the boundary with the outside. 4 : Main entrance facade and riwaq.5 : Landscaping and triangular cascade between the main gate and entrance doors. 6 : Construction of the steel frame was followed by installation of the curtain-wall panels, starting from the bottom. イスラム開発銀行本部ビル 動画QRコードIslamic Development Bank Headquarters QR code for videohttps://youtu.be/I4AiJz5lbRI7 : Following the steel frame construction shown in photo 6, the stone finishing is applied starting from below. 8–9 : The rapidly changing old town area in the vicinity of the building. Photo 8 was taken in 1993, the year construction was completed, while photo 9 was taken in 2022. A master plan being undertaken by the government, existing buildings are being taken down over a wide area, and one-quarter of the district has already been cleared.1993年撮影｜Taken in 19932022年撮影｜Taken in 202209高いサステナビリティとメンテナンスを可能にした仕組みと技術力遮熱機能を有する40mm厚のトラバーチン仕上げの外装は、下地として軽量気泡コンクリート（ALC、75mm）・高密岩綿（50mm）の上に防水防湿シートと放熱空気層（80mm）を確保。パネル設置時の石仕上げ破損を考慮して、ALCと岩綿の二重断熱層で構成されたカーテンウォール鉄骨ユニットを工場でプレハブ化したことで、工期短縮と品質確保を両立させています。　現地で顕著な砂塵による汚れ対策として、外壁構成材である石は砂塵類似色を選択し、外周の回廊も砂塵色に着色した鉄筋コンクリート打ち放し（細骨材も類似色）をサンドブラストで仕上げています。ソリッド外壁部の断熱仕様と直射遮蔽対応スリット窓に加えて、直射の当たらない間接採光を取り込む外装デザインにより可能な限りの省エネルギー構造を実現したことが、結果的に現代のLEED水準に値する性能を達成しました。Structure and Technology to Enhance Sustainability and MaintenanceThe 40mm-thick heat-shielding travertine-finished exterior is secured by a waterproof moisture-proof sheet and a heat-ra-diating air layer (80mm) over lightweight aerated concrete (ALC, 75mm) and high-density rockwool (50mm) as a base layer. Considering the possibility of damage to the stone fin-ishing during panel installation, the curtain wall steel frame unit, consisting of double insulation layers of ALC and rock wool, was prefabricated in a factory, thereby shortening the construction period and ensuring quality at the same time. To prevent discoloration that might result from the region’s infamous sandstorms, we used sand-colored stone for the outer walls as well as sand-colored steel-reinforced unfaced concrete (including the fine aggregate component) for the perimeter arcade, which was applied by sandblasting. wall sections and direct-light-shielding slit windows, the exterior design makes use of indirect lighting without letting in direct solar rays, enabling maximum energy savings and resulting in a performance that lives up to modern LEED standards.In addition to the heat-shield panels of the solid external