To establish the return on investment (ROI) of a smart building solution, the current costs of energy, people, and property must first be substantiated. A holistic smart building solution starting with a single sensor can efficiently manage energy consumption, ensure safety compliance through proactive procedures, enable predictive analytics for climate control, provide integrated security tracking of people and assets, and allow for efficient utilization of property and increased productivity of people. An illustrative example is then provided to demonstrate the potential ROI of such a smart building solution.