Please answer the following question: Riverwalk Hotel Detroit - The Roberts Riverwalk Hotel and Residence Detroit formerly the Parke-Davis Research Laboratory also once known as Building 55-Detroit Research is located on Joseph Campau Street at the Detroit River in Detroit Michigan. The former research facility was redeveloped as a boutique luxury hotel located on the Detroit International Riverfront. The building was designated a National Historic Landmark in 1976. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Building