The Wayne County Building is a monumental government structure located at 600 Randolph Street in Downtown Detroit, Michigan. It formerly contained the Wayne County administrative offices – now located in the Guardian Building at 500 Griswold Street – and its courthouse. As Wayne County Courthouse, it was listed on the National Register of Historic Places in 1975. When it was completed in 1902, it was regarded as "one of the most sumptuous buildings in Michigan".