The SDE4 is the first new-build net-zero energy building in Singapore and the National University of Singapore’s (NUS) flagship sustainability project. The building demonstrated that net-zero performance is achievable in a dense, tropical climate. Beyond energy neutrality, SDE4 integrates passive design, hybrid cooling, extensive solar panel arrays, and rainwater harvesting, while prioritising occupant health and wellbeing. NUS further positioned the building as a living laboratory, embedding research, teaching, and industry engagement into its daily operation. Notably, SDE4 demonstrates how green buildings can generate broader environmental and social value, ranging from reduced embodied carbon and water use to health benefits and knowledge sharing, beyond direct cost savings. The case will enable students to understand and compute the integrated environmental and social value of SDE4.