Come Relax with History and Charm. Built in 1891, the Schuster Mansion is located just west of Marquette University, in the B&B district, in the historical neighborhood of Concordia College, in Milwaukee, WI. Was known as the "Red Castle" in it's hey day and is listed on 3 levels of the National Register of Historic Places. Centrally located just minutes from all of Milwaukee's wonderful events and sites, Summer Fest, Wisconsin State Fair, Miller's Station, home of the Brewers, Harley-Davidson Museum, and Miller Brewery, are just a few.