The official home coordinates as a Web Feature Service (WFS) service with continuously updated data in the ETRS89 system (EPSG 4647) and as GeoJSON file in the WGS84 (EPSG 4326) system. The GeoJSON file is updated every six months.
Source: FB 62 — Office for Geoinformation, Surveying and Cadasters
Note: The WFS service is an interface for retrieving vector data from the urban ALKIS system. The service can only be addressed and processed by a corresponding geoinformation specialist application. Due to the missing graphical interface, a preview in the browser window is therefore not possible.
For illustration, here is a screenshot from the system:
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