chapter house vs home office

chapter house

noun
  • A building used by a sorority or fraternity as a residence or meeting place. 

  • A building attached to a cathedral, church, or monastery and used as a meeting place. 

home office

noun
  • The headquarters of an organization. 

  • A room, in a person's home, equipped as an office so that the person may work from home. 

How often have the words chapter house and home office occurred in a corpus of books? (source: Google Ngram Viewer )