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Due to the urgent need for a response to energy security, aging commercial buildings are required to conform to increasingly stringent environmental standards, particularly with regard to energy and water consumption. Solutions to reach the energy-related goals seem to exist. However, it is often difficult to gain synergistic benefits from the installations.The energy savings actually achieved are often disappointing. Systematic measurement and verification are rarely available due to the high initial cost of such studies. Therefore, there is a significant chance that misunderstandings and unrealistic expectations will affect decision making related with building sustainability. The ability to synthesize emerging technologies into a robust computational platform for monitoring coupled human-building environments is lacking. This paper discusses developing a prototype of BIM-based Baseline Building Model (B3M) for aging commercial buildings. As-built BIM of a public building was employed as a platform for delivering user-actionable information to building occupants, maintaining healthy environments, and achieving further energy savings. Initial testing was conducted at the Technology Innovation Center with data collected for four months. The results of this study showed that B3M provides a robust computational platform for monitoring coupled human-building environments. B3M would be a useful system when aging commercial buildings need to measure and verify accurate benefits of the installations. Expanded use of BIM would allow for more detailed analysis of building energy performance. BIM-based building energy models can be designed to store energy performance data such as consumption, temperature, CO2 emissions, occupancy, and humidity. In addition, the connection to the BIM allows facility managers to simulate occupancy changes, facility upgrades, or energy management strategies based on potential energy demandsIf a building baseline model is created directly from an upto-date BIM, the energy model can be regenerated as the operating conditions are updated. Facility management processes can be improved significantly through the use of an as-built BIM that can integrate real-time building performance data. AS-BUILT BIMThe Technology Innovation Center (TIC) of the Milwaukee County Research Park (MCRP) was used as a test bed.Data from the sensors were recorded on Onset's HOBO® Ethernet Communications Data Loggers, model U30-ETH, in 5-minute intervals and were transmitted to the Onset's database server via data organization software HOBOware