This white paper discusses how Esri ArcGIS CityEngine, NVIDIA Omniverse, and Dell Technologies accelerated server platforms can be used to create, collaborate, and explore 3D city designs for Smart City management. It details practical examples that show Esri ArcGIS CityEngine in action and its interoperability with NVIDIA Omniverse, and it finishes by demonstrating Digital Twin simulation capabilities with an imported GIS workflow.