The Littlefield-Roberts House is an historic house at 16 Prescott Street in Cambridge Massachusetts. The 2.5 story wood frame house was built in 1873 by Joseph Littlefield and is one of the finest late Second Empire houses in the city. The main facade has a heavily ornamented entry on the left and a full-height projecting bay on the right that is capped by a polygonal roof. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Building