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One Campus Martius is a building located at in downtown Detroit, Michigan. It began construction in 2000, and finished in 2003. It has 17 floors in total, 15 above-ground, and 2 below-ground, and has 1088000sqft of office space. The high-rise was built as an office building, a restaurant, retail space for Compuware, and has a fitness center inside, as well as an atrium. The building now has Quicken Loans, Meridian Health, Plante Moran and Compuware as its major tenants.The building was constructed in the late-modernist architectural style, using glass, granite, and limestone as its main materials. AIA Detroit's Urban Priorities Committee rated the building's entry as one of the top ten Detroit interiors.HistoryThe building sits on the Kern Block which was once home to the Kern Department store. The store had existed in some form or another on this site since 1900. The last incarnation of the store was demolished in 1966, and the area remained greenspace until 1999 when Campus Martius Park began to take shape. Compuware moved its headquarters and 4,000 employees to a newly constructed building on the site in 2003. Quicken Loans agreed to a five-year lease agreement to move its headquarters and 1,700 employees to the building in 2010. Plante Moran followed suit with a lease agreement in 2013, deciding to move 75 employees to the building.