Which aspect of a building system is NOT typically reviewed during the commissioning process?

During the commissioning process, the main focus is on ensuring that a building's systems are functioning as intended and meet the specified performance criteria. This includes reviewing system performance, which assesses whether the various mechanical, electrical, and plumbing (MEP) systems operate correctly and efficiently. Additionally, operational efficiency is a key consideration, as commissioning aims to optimize energy use and ensure that systems run without unnecessary energy waste. Safety features are also closely examined during commissioning because they are critical for occupant well-being and compliance with regulations.

On the other hand, aesthetic design elements are not a primary focus of the commissioning process. While aesthetics are important for the overall design and functionality of a building, they do not directly impact the operational performance or efficiency of building systems, which is the core purpose of commissioning. Therefore, it is clear that aesthetic design elements are typically not reviewed during the commissioning process, making this the correct choice in the context of the question.