The ST Diamond Building is a landmark energy efficient and environmentally friendly building for the Malaysian Energy Commission (Suruhanjaya Tenaga) in precint 2 in Putrajaya, Malaysia. The building underwent a genuine integrated design process with climatic design playing a key role in giving shape to the building. The unique building is self-shading for direct solar radiation on the North and the South facades. Moreover, the atrium is optimized to direct diffuse daylight into the building. The crown of the atrium has spectrally selective glazing and a dynamic shading system that so that balanced Cool Daylight is admitted to the atrium in response to outdoor lighting conditions. The Diamond Building has a building integrated cooling system with PEX pipes embedded in the concrete floor slabs. This allows to do 40% of the cooling at nighttime, by storing the cooling in concrete structure of the building, hereby decreasing the peak cooling load during the daytime. The stored cooling is passively release to the indoor environment during the day with a 1.5°C diurnal temperature swing of the concrete slab, namely 21°C (beginning of office hours) and 22.5°C (end of office hours). The ST Diamond building was the first office building obtain the highest green building certification both in Malaysia (GBI Plantinum) and outside of Singapore (Green Mark Platinum).