The Kohlhagen Building in Roseburg, Oregon, USA, is an architectural marvel that boasts Italian Renaissance Revival-style elements like arched windows, intricate brickwork, and a grand cornice. Constructed in 1907 by William Herman Kohlhagen, the building features ornate woodwork, high ceilings, and elegant lighting fixtures within its interior. It is home to numerous businesses throughout history and offers panoramic views from its rooftop terrace. In 1986, it was added to the National Register of Historic Places. Today, the Kohlhagen Building continues to be a vital part of Roseburgs community, showcasing its rich tapestry of historical significance and architectural beauty.