Answer the following question: Irvine Park in Orange California is a 160-acre (65 ha) park that became Orange County's first regional park in 1897. It includes architecture by Frederick Eley. It was listed on the National Register of Historic Places in 1983.It includes six contributing buildings four contributing structures and four contributing objects. 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