In this task, you are given a text which is the body of a document. Your job is to classify the topic of the document into these categories: 1)Company, 2)Educational Institution, 3)Artist, 4)Athlete, 5)Office Holder, 6)Mean of transportation, 7)Building, 8)Natural place, 9)Village, 10)Animal, 11)Plant, 12)Album, 13)Film, 14)Written work. Your output should be the category number. Don't generate anything apart from numbers 1-14.
Q: Text:  The Enrollment Services Center is a building at Iowa State University in Ames Iowa. It houses Offices in Enrollment Services: Admissions Orientation Records and registration. In 1978 the building was placed on the National Register of Historic places.
A: 
7