Another major retail warehousing park planned for a site at the end of the M50 near Malahide in north Dublin has been blocked by An Bord Pleanala. Last month, the board overruled an earlier decision granting permission for 340,000 sq. ft of retail warehousing off the N1 near Swords. Walls Properties, a subsidiary of PJ Walls construction company, will now have to drop its plans to develop 200,000 sq. ft of retail warehousing on a site of 24 acres on the north-western side of the motorway at Malahide Road. The reasons cited by the board for refusing both developments are virtually identical - the parks would adversely affect the flow of traffic on major roads and would also impinge on established retail outlets in the areas. While property developer David Daly is expected to seek approval for a scaled-down retail development on the Swords site, Walls is likely to opt for a different type of scheme. It is looking at the possibility of developing a "motor plaza" to include about car 10 showrooms and a substantial volume of office space.