SEATTLE â A South Korean investment group will buy a 95% stake in a newly opened 38-story office tower downtown for $669 million, developer Skanska announced this week. Hana Alternative Asset Management and Hana Financial Group will buy control of the 2+U building at Second Avenue and University Street. The Swedish development company Skanska will hold on to a 5% stake as it continues leasing out retail space on the lower floors. Skanska, which finished the project last year, believes the sale is the biggest real estate transaction for a single property in the United States since the start of the pandemic. Murphy McCullough, Skanskaâs executive vice president for the Seattle market, said in an interview the sale signals interest in the core of the city, even as the pandemic has quieted much of downtown.