Originally named the Union Trust Building, the Guardian Building is one of the many skyscrapers built in Michigan during the 1920s. It a class-A office building that is an excellent example of the Art Deco style.

This 36-story building is basically a commercial structure, built by the founders of the Union Trust, Colonel Frank Hecker and former Michigan Senator James McMillan. It functioned as the US Army Command Center during the World War II. It passed ownership through time, and was acquired by the Wayne County in 2007.

Also known as the Cathedral of Finance, the Guardian Building is now one of the most popular tourist spots in Michigan and is a National Historic Landmark as well as a contributing property for the NHL District, the Detroit Financial District.