The IIHS Bengaluru City Campus (BCC) expansion necessitated the retrofitting of an existing commercial building into a high-performance teaching and learning space. With urban land constraints and the need for rapid execution, IIHS opted for a sustainable retrofit approach, transforming the 1,350 sqm structure into an energy-efficient and resource-conscious facility. The project focused on optimizing thermal comfort, occupant well-being, and operational efficiency through advanced design techniques, IoT-based monitoring, and innovative material choices. This book documents the planning, execution, and impact of the retrofit, demonstrating how adaptive reuse can meet the evolving demands of urban education while minimizing environmental and financial costs.