Not one condominium has been sold in Shanghai's most expensive housing project, reported state media, signaling that the city's luxury property boom is no more. Costing US$13,580 a square meter, condos in the Tomson Riviera project have set a record as the city's most expensive flats. Of the first 74 condos, the cheapest is a 434-square meter apartment priced at US$4.68 million while the most expensive sells for US$21 million.