Energy Star rated commercial office space has been well researched in the United States with national level data. This research takes a step back from this aggregate data and investigates the impact that an Energy Star rating has on the rent of commercial office space in the Denver, Colorado market. Rent data from the Denver commercial office space market was collected and analyzed using the framework of an existing model from a previous research study. The value of an Energy Star Rated building is considered through both the risk and return of an investment. While the results do not yield a rent premium for Energy Star rated office space in the Denver market, the risk is shifted, reducing exposure to the energy industry which could prove as an equally valuable asset for institutional investors and developers.