back forty vs real estate

back forty

noun
  • The most remote or inaccessible part of any place. 

  • The remote part of a farm. 

real estate

noun
  • Property that cannot easily be moved, usually buildings and the ground they are built on. 

  • Space used for a particular purpose. 

How often have the words back forty and real estate occurred in a corpus of books? (source: Google Ngram Viewer )