Mary Fitzpatrick (Fianna Fail) | Oireachtas source

What is the procedure when a building has previously been certified as suitable? I am thinking of an office building or any commercial property. I am based in Dublin's north inner city, where there were a lot of older properties that may have originally been built for single-family use, were subsequently subdivided into bedsits and now might be in use as hostels. What is the procedure there?