Cian O'Callaghan (Dublin Bay North, Social Democrats) | Oireachtas source

Therefore, a possible explanation for those in the informal or unknown category is that they are informal letting arrangements, but the information that Mr. Culhane has given us suggests ruling out licensees, for the most part, because licensees are generally in rent-a-room situations. That is generally ruled out by the description that Mr. Culhane has given me. This is just my summation. If Mr. Culhane feels I am being particularly inaccurate, he can let me know.