By the way, because it was already mentioned in this thread:
New planned event hall Vienna
Capacity: 20,000
Start of construction 2021, completion 2024
Cost: 250 million Euros
Many parking lots for visitors, trucks with stage equipment should be able to drive directly into the hall.
No modesty in this major project. "This arena will make an international sensation as a venue" says the budget chief of Vienna.
An architectural competition will be launched in the second quarter of this year. In any case, the building should not only be functional, but also visually setting an "architectural landmark" .