ONE of the best-known restaurants along the south Dublin coast The South Bank, at 1 Martello Terrace, Dun Laoghaire, is expected to make about £450,000 when it is sold shortly through Sherry FitzGerald. The three-storey corner building dates from 1840 and has clear views over Scotsman's Bay. The restaurant can seat up to 60 people and if more space is required. there is planning permission to enlarge both the restaurant and the kitchen. The restaurant, which won a Bord Failte award in 1990, is extremely well located midday between Dun Laoghaire and Sandycove. The two upper floors are used as residential accommodation, which includes four bedrooms.