Add viewpoint "Schneebergblick".
Use of aeroway=aerodrome only one time for the complete area.
Moved all tags to main building.
Height tag should only for building or parts with actual height.
Update of heights and footprints of the UNO City Vienna.
Missing 'Building' tag for Torre Rio Sul.
Aerialway=station exists already in other objects.
Buildings are stations where people can get in and out.