Editor’s note: This article was updated at 3:20 p.m. to clarify group involvement in the proposal.
A performing arts center that would include the former Des Moines City Hall would be a transformational project for the city, helping preserve a historic building and spurring further redevelopment in the area, those behind the proposal say.
It is an endeavor that organizers say would require raising about $200 million, including an endowment that would be as much as $25 million…