Friar Mansions

Poirot lived at Friar Mansions in London at some point in the early part of his career. It is featured in the short story The Third Floor Flat when a young woman Ernestine Grant was found murdered in a flat two floors below his. Friar Mansions was a building with five storeys and Poirot lived on the top floor. He had taken the flat under the name "O'Connor".