Очень помогающий ответ!
Я нашёл две проблемы:
1. In Russia you don't have what is widely known as: ground floor.
2. In Russia the "ground floor" is called just "first floor".
3. In my picture the floors are four.
Can I say that this building has: "уровни = 5" or is preferable to say: "Этажность=4 + подвал"