Carrefour was being cautious when it valued its property portfolio at EUR15bn-EUR20bn, ceo Jose Luis Duran told the Financial Times on Monday. The statement comes on the back of Thomas Barrack's claim that the French retailer has assets worth more than EUR30 bn. The founder of Colony Capital said that the retailer could raise up to EUR 30bn by using techniques such as sale-and-leasebacks aimed at releasing value from property.