You can download all these geospatial data on topoexport.com all Germany covered:
ALKIS: Buildings (2D) and cadastral parcels (licensed under DL-DE/BY-2.0)
3D Building Model: Buildings in LoD2 standard (licensed under DL-DE/BY-2.0)
DLM: Roads, railways, hydrography, and canopy coverage (licensed under DL-DE/BY-2.0)
DGM1: Digital Terrain Model (DTM, 1m resolution) (licensed under DL-DE/BY-2.0)
All German cities are available for download.
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