Was the destroyed building only a mosque in the sense that it was a regular building which had been utilized as a mosque?
It is very difficult to imagine a regular, domed mosque being demolished in Europe for, especially, Oriana Fallaci Plaza.
It would be well to learn where the former mosque attendees went to, and something about the presumed other mosques in that city.
I think it was more "a building used by Muslims for prayer" rather than a custom-built mosque. I'm thinking the Muslims probably rented some building and were using it as a prayer hall, and the city decided to condemn it for a park
If I get any more info on the story, I'll post it.