Graz – An expansion of the Graz Merkur Arena would cost around 150 million euros to 20,000 seats. This has shown a feasibility study that the city of Graz has developed in the past few months. The city itself could make 30 million euros available, and the state of Styria had also signaled willingness to co -finance, it said on Thursday after the presentation at the municipal council meeting. In any case, other donors will be necessary.