The Gilbert Row is a group of historic rowhouses in the southern part of the Walnut Hills neighborhood of Cincinnati Ohio United States. Composed of six individual small houses and a more substantial structure designed as a commercial building the row was built by the real estate firm of Thomas Emery's Sons according to a design by the Steinkamp Brothers architectural firm. 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