The Guardian Building is a landmark skyscraper in the United States, located at 500 Griswold Street in Downtown Detroit, Michigan, within the Financial District. The Guardian is a class-A office building owned by Wayne County, Michigan and serves as its headquarters. Built in 1928 and finished in 1929, the building was originally called the Union Trust Building and is a bold example of Art Deco architecture, including art moderne designs. At the top of the Guardian Building's spire is a large American Flag, complementing the four smaller flags atop nearby 150 West Jefferson. The building has undergone recent award-winning renovations. It was designated a National Historic Landmark on June 29, 1989, and the associated Detroit Financial District is on the National Register of Historic Places. The Guardian building includes retail and a tourist gift shop.