AC Hotel San Diego Downtown Gaslamp Quarter occupies 743 Fifth Avenue in downtown San Diego's Gaslamp Quarter, placing Marriott's European-inspired lifestyle brand on the pedestrianized stretch of Fifth Avenue. The AC Kitchen serves a continental spread built around artisan cheeses, cured meats, and signature egg dishes each morning, while the ground-floor AC Lounge pairs tapas-style plates with craft cocktails on the same block where Lionfish Modern Coastal Cuisine runs its seafood program. A guest-exclusive rooftop bar opens Thursday through Sunday with locally sourced cocktails and skyline views across downtown to San Diego Bay. The property sits less than a quarter mile from Petco Park and within walking distance of the San Diego Convention Center, catching both Padres season foot traffic and year-round convention business. Gaslamp Quarter nightlife and entertainment — including immersive experiences at The Escape Game San Diego — surround the hotel on all sides of the Fifth Avenue corridor. The rooftop venue handles private buyouts for corporate receptions and convention-adjacent events overlooking the Gaslamp Quarter skyline.