This lecture traces the evolution of intelligent and smart buildings, from early mechanical and manual systems to today’s AI-driven environments. It covers the transition from pneumatic controls and thermostats to DDC, BMS, IoT, cloud analytics, AI, and digital twins, while highlighting major milestones such as the 1970s energy crisis, the emergence of the Intelligent Building concept, and the impact of COVID-19. The lecture concludes by examining the key drivers shaping the future of building intelligence.