Q:San Jose Observatory - The St. Joseph Observatory (OSJ) is an amateur astronomy observatory located in Buenos Aires Argentina. It was founded in 1913. It was initially constructed on 1870 and for being the tallest building was declared ideal observatory of Balvanera neighborhood. It is the first astronomical observatory in Buenos Aires which still remains in activity.Currently performs research and recreational activities for the public as courses or seminars. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Building