palace vs tower block

palace

noun
  • A large, ornate public building used for entertainment or exhibitions. 

  • A large and lavishly ornate residence. 

  • Official residence of a head of state or other dignitary, especially in a monarchical or imperial governmental system. 

tower block

noun
  • A tall residential or office building. 

How often have the words palace and tower block occurred in a corpus of books? (source: Google Ngram Viewer )