What you would expect to get from a geospatial file for building footprints is a polygon representing that footprint and at best, some metadata that indicates the height of the building which can be extruded to the correct heights. Because it is inherently 2 dimensional it lacks any definition of what happens in the Z-axis. The reason for that lies in the limitations of the underlying geospatial data. The most obvious lack of detail is the fact that none of the buildings look as they do in real life. While it does provide a great deal of data in context with virtually no more effort than launching the software, it does leave a bit to be desired. Here is an image of what you would typically get from model builder. The robustness of model you receive is dependent on what free data is available for the selected area, but with minimal effort you can start increasing the accuracy of your model.
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