spyglass, k100d, metalfab, thank you for these kind comments!
This is called Sanomatalo ("house on news"), it is the head quarter of the biggest media corporation in Finland, Sanoma Ltd, located right in the middle of Helsinki. It is build like a cross shape but so that diagonally it is covered by huge glass walls forming a bigger building around the inside actual building. So there are huge lobbies on the corners, this is the biggest.
Every mechanical structures are left in view, as you can see...
Sanomatalo is very photographer friendly, there are often photo exhibitions in this lobby.
I had it as a great target when testing my then new Sigma 10-20mm.