Here in Madison we've got a spectacular stadium, opened in 1926, called Breese Stevens Field. The field is a historic site, is owned by the city, and just recently went under the operations umbrella of the company that runs the Madison Mallards (at another city owned field). The Mallards updated Warner Park into a top of the line minor league stadium, and I've got fingers crossed they'll do the same at Breese.
The idea is that the Mallards (who have made the Northwoods League into one of the best collegiate leagues in the nation, and the Mallards at the top of that list) can start a mid to upper level soccer club that can fill a 10,000+ seat stadium. The current stadium seats up to 4,000 and can hold ~7,500 for concerts. The concept would hold ~11,000 and ~13,000 for on field/concert events.
This was my first Google Sketchup project, so I hope you enjoy. I did what I could to keep the current structure as untouched as possible, due to it being a registered historic site.
New concourse: houses concessions as well as locker rooms.
The raised open corners would have shrubbery/small trees because why not?
New press box and box seating.
View from the upper-deck beer garden. The Mallards have had great success with their "Duck Blind" beer garden in right field.
The stadium borders are the same as the current borders, taking up one city block.