ABOUT a quarter of the 56 units released for The Residences at W Singapore Sentosa Cove were sold over the weekend for prices starting at $3.4 million. This upscale condominium, which is part of the trendy 'W' boutique hotel brand, is being built by City Developments. Its spokesman said the price achieved during the exclusive by-invitation-only preview was in line with its launch price of between $2,500...