I would think that in a larger multi-family house those costs are quite a bit cheaper 'per-capita' than in a single family house. It evens out for an owned flat

I would think that in a larger multi-family house those costs are quite a bit cheaper 'per-capita' than in a single family house. It evens out for an owned flat in a large house of course, but I guess that's even rarer in Germany than elsewhere (especially outside cities).