premise: The former Isanti County Courthouse, located at 237 2nd Avenue, South West, corner of Birch Street, in Cambridge, Minnesota, United States, is an historic two-story redbrick county courthouse built in 1888. Today it is known as Court House Square and has been remodeled into a private office building.
hypothesis: The Isanti County Courthouse is over 125 years old. 
reason: I didn't specify the current courthouse, only the Isanti courthouse which is 131 years old. 