Osa Rooftop is a stylish Pasadena rooftop spot on top of the AC Hotel, built around a big olive tree with Baja California design vibes and mountain views, serving modern California dishes from Chef Carlos Couts like crudos, pastas, and seasonal small plates, plus a creative cocktail program with drinks like the Cactus Cooler and Triple Cali Spritz; it’s trendy, scenic, a little pricey, and definitely more “elevated dinner with a view” than cheap rooftop bar, but solid if you want good food, good drinks, and a well-designed space without feeling too pretentious.