'POST Rotterdam' is the redevelopment of the former post office on the Coolsingel in Rotterdam. See https://www.postrotterdam.nl (Dutch).
This is the back of the national monument from 1915-1923, one of the few buildings that survived the war and post-war reconstruction.
The front of this eclectic building with classical and art-deco elements remains untouched, but a modern residential tower of 155m will soon arise (in style) at the rear. The time when high-rise buildings in the center could not get further than the drawing board is definitely over.
