1990's KONE M-series elevator with two doors over 90 degrees in Copenhagen 

I have also heard/seen the rare-sounding door motor on hydraulic KONE lifts that are not used so much. Take a look on some of my videos of Copenhagen Airport, there you will for example see a triple-telescoped door on a hydraulic lift that is very rarely used. In fact i have never seen anyone use it except myself and PostTower

Side door opens at all 4 upper floors. Front door only at ground level entrance

Yeah me too. The exact two reasons i filmed it :-)

where does each door open?