frontage vs outer layer

frontage

noun
  • The front part of a property or building that faces the street. 

  • The land between a property and the street. 

  • The length of a property along a street. 

  • Property or territory adjacent to a body of water. 

  • The front part generally. 

outer layer

How often have the words frontage and outer layer occurred in a corpus of books? (source: Google Ngram Viewer )