Earlier this year the "Land Cover Map of Europe 2017" with 10m pixel size has been published, see http://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-2/Land-cover_maps_of_Europe_from_the_Cloud .
It is a pan-European map, yet potentially interesting for you due to its high spatial resolution.
At country level, you find for ...
Currently there are 8596 data records with addresses available for the city of Radebeul.
The Adress data for For Saxony (Free State of Saxony) in Germany can be downloaded in zip-format from the following link:
The inside of the archive includes several files:
A file with addresses &...
there are many, but this one at 398 kb should probably work.
It's not "official", though. For official, you'll have to make your own geojson from here.