homeassistant-config/.storage/core.floor_registry

{
  "version": 1,
  "minor_version": 1,
  "key": "core.floor_registry",
  "data": {
    "floors": [
      {
        "aliases": [],
        "floor_id": "unten",
        "icon": "hue:room-living",
        "level": 1,
        "name": "Unten"
      }
    ]
  }
}