[usrusr]

...and the secret sauce of keeping rents down have been conscious efforts at keeping second and third tier cities and towns attractive for business, which distributed demand and thus kept it somewhat in check in the naturally attractive metropolitan areas. E.g. most of those small, highly specialized industry (car and other) suppliers that are the backbone of the German industry are based in cities you never heard of, that's not a coincidence but the result of careful balancing.

In recent years (decades, actually), we seem to have dropped the ball in the counter-centralisation game, maybe as a consequence of reunification.