In recent years, there has been intensive research on the Internet of Things (IoT), especially in the field of Industrial Internet of Things (IIoT). Building owners and tenants in commercial sectors are benefiting from this development. The efficiency and comfort of buildings have been improved by using various sensors and intelligent algorithms. Nonetheless, existing publications in the field of Smart Commercial Builidings (SCB) are limited. As the topic is becoming increasingly relevant for both, applying companies and providers of software and hardware solutions, this paper clarifies fundamental terms. It explains the terms Digital Twin (DT) and Digital Shadow (DS) in the context of SCBs. Furthermore, it reviews common use cases for SCBs. In order to identify those use cases, the method Grounded Requirements Engineering (GRE) is applied.