Osa Rooftop 540 East Colorado Boulevard, Pasadena, CA US 91101 5 Hour Open Bar Dress Code: New Year's Eve Festive - Casual Evening Ring in the New Year On The Only Rooftop in Pasadena! Take your New Year to new heights at Osa Rooftop, the ONLY rooftop bar in Pasadena! From its stunning hillside views to its reputation for gourmet Californian cuisine, Osa pays exquisite homage to its home state. Enjoy a premium open bar, live DJ performances, and complimentary light food fare, all while taking in breathtaking views of Southern California. About Osa Rooftop Found at the top of Pasadena's AC Hotel, Osa Rooftop is where modern California cuisine meets breathtaking views. Elevate your evening at Osa Rooftop with a curated cocktail experience inspired by the spirit of California. Our creative array of crisp, refreshing, and beautifully balanced drinks is designed to perfectly complement the rooftop's stunning views and modern menu.