A PRIVATE investor has paid in excess of £600,000 for a four-storey over basement Georgian office building at 11 Merrion Square Dublin 2. The Gunne agency handled the sale of the building, which is currently producing a rental income of £48,000 from five lettings. There are two vacant suites, which when let will bring the rent up to £66,000. Willie Dowling of Gunne handled the sale for a UK property company.