Historically known as the American Hotel, the DoubleTree by Hilton Hotel Atlanta Downtown—the city’s longest operating hotel, which first opened in 1962—completed a $16 million renovation in October. The renovation, which was led by hospitality developer Legacy Ventures, has reimagined the style of the property’s original 1960s atmosphere, and includes upgrades to the hotel’s 315 guest rooms and public spaces. The public spaces and rooms now feature mid-century decor, including vintage mini fridges and car-theme headboards. The hotel’s new restaurant, the Cloak Room Kitchen and Bar, offers ’60s-inspired furniture, menus that resemble dossiers, and a map of the Cuban Missile Crisis. The hotel has nearly 20,000 square feet of meeting and banquet space, including the Apollo ballroom that holds as many as 400 for receptions and 340 for a seated meal. The hotel also has 15 breakout rooms and a ninth-floor, 2,200-square-foot penthouse for V.I.P. receptions.