Jean Nouvel’s lawyers say sums demanded from him are ‘totally disproportionate’. The architect behind the Philharmonie de Paris, one of the world’s most expensive concert halls, is suing the body that manages it over fines issued against him when the building opened over-budget and behind schedule.

The cost of the concert hall rose from €173m when the project was announced in 2006 to €386m by the time it opened two years late on 14 January 2015... [+]