My ideas:dirk Peeters wrote:looks unfinished
perhaps for passing large objects later or installing doors but as Arthur mentioned
i ll never seen a door installed like that so Arthur I ll guess you are right
1) The walls are intact so removal after the war, when done, was done very precise.
2) The re-bar is still intact. taking in consideration the steel beam thickness, you don't win much height by removal. 5-10cm I guess. This could be enough off coarse to remove stuff but sound not logical to me.
I go for Dirk's idea: unfinished. Steel beams where getting harder to get, or not in time.