condominium vs floor-through

condominium

noun
  • An individual unit (such as an apartment) in such a complex. 

  • Joint sovereignty over a territory by two or more countries. 

  • The system of ownership by which such condominiums operate 

  • A region or territory under such rule. 

  • The legal tenure involved. 

floor-through

noun
  • An apartment which covers the entire depth of a building. 

How often have the words condominium and floor-through occurred in a corpus of books? (source: Google Ngram Viewer )