The Otter Tail County Courthouse is one of the finest Beaux-Arts public buildings in rural Minnesota, completed in 1905 in pink Sioux quartzite and buff limestone. The building sits at the south end of the downtown core and anchors the town's Victorian streetscape. The interior retains original woodwork, ornate plasterwork ceilings, and a central staircase that remains largely unchanged from 1905.
The courthouse is a working government building, open during business hours. Visitors are welcome to enter the public areas. The building was listed on the National Register of Historic Places in 1980. Around it, the downtown grid has an unusually high concentration of National Register buildings within a few blocks — the Hotel Kaddatz, the River Inn, and the Red River Milling Company are all nearby.