DoubleTree by Hilton is branding three properties in Australia today and will rebrand the Fontana Park Hotel in Lisbon, Portugal. The Australia hotels are the 184-room DoubleTree by Hilton Darwin, with three meeting rooms; the 197-room DoubleTree by Hilton Esplanade Darwin, with six function areas; and the 235-room DoubleTree by Hilton Alice Springs, with 6,000 square feet of meeting space. The 139-room DoubleTree by Hilton Lisbon-Fontana Park, which comes online this summer, can host up to 400 for an event.