Please answer the following question: Alamo Ranchhouse -  The Alamo Ranchhouse near Steamboat Nevada is a historic plantation style mansion that was built in 1887. Also known as the Moffat Ranchhouse it was listed on the National Register of Historic Places in 1979. The listing included one contributing building and one contributing structure.It is significant as the home of John Sparks governor of Nevada during 1903-08 and later as the home of cattle baron William H. Moffat. 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?
A:
Building