The most expensive house on the market this year is still just that - on the market. A price tag of £8 million (€10.16m) was put on Kenah Hill, Martin Birrane's imposing pile in Killiney, but so far there have been no takers. Now An Bord Pleanβla has added to his property woes by refusing him permission to build a new house with a swimming-pool and caretaker's quarters on a one acre site of the former grounds of Kenah Hill.