The William H. Welch House is a three-story rowhouse located at 935 St. Paul Street Baltimore Maryland and is notable as the residence of William H. Welch from 1891 to 1908. Welch was one of the Big Four founding professors at Johns Hopkins Hospital. 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