CityEngine
CityEngine is advanced 3D modeling software for creating huge, interactive and immersive urban environments in less time than traditional modeling techniques. The cities you create using CityEngine can be based on real-world GIS data or showcase a fictional city of the past, present, or future.
Virtually all SimStadt workflows require a 3D model, provided as CityGML. It can be time consuming to create a model from scratch, e.g. at the beginning of a project. While data is missing, CityEngine could be used in order to create a model.
The buildings can then be replaced once more information is available.