Every year on Adolf Hitler's birthday, anti-fascist protesters organise a rally outside the building
"Hitler would have loved social media," he added. "It's the most powerful marketing tool an extremist could ever hope for."
The state seized the dilapidated building in the northern town of Braunau in December.
Although Hitler only spent the first few weeks of his life there, the address has been a thorn in Austria's side for decades.
A new building on the site would be used by a charity or the local authorities.
The previous record for a work by Cattelan, who is 55, was $7.9 million.
"We are currently examining the creation of a law, which would force a change of ownership and pass the property to the Republic of Austria," interior...
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