Wertz Mill is a historic grist mill located in Wernersville Berks County Pennsylvania. It was built in 1892 and is a three-story brick building with a mansard roof in the Second Empire style. It measure 60 feet by 58 feet 3 inches and features a cupola atop the roof. It has a two-story brick extension built in the 1930s. The mill remained in operation until 1969.It was listed on the National Register of Historic Places in 1990. 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