St Augustine's Tower stands in St John's Church Gardens in Hackney Central in the London Borough of Hackney just off the southern end of the Narrow Way (formerly Church Street). It is all that remains of the early 16th century parish church of Hackney of St Augustine which replaced the 13th century medieval church founded by the Knights of St John. The Tower comprises four stages beneath a restored parapet with diagonal buttressing. 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?
Answer:
Building