This Starbucks is located at Green Street and S. Marengo Avenue, on the corner of the Pasadena Convention Center. There is a public entrance on one side and an entrance from the Exhibit Hall and Ballroom building.
Hook up to free wifi from the Pasadena Convention Center.
Go out the back door and you will find ample seating and bathrooms, inside the Pasadena Convention Center. This is reserved for Starbucks. It's open most weekdays until 4 PM but on weekends this location is only open based on events happening at the convention center so make sure to call ahead to make sure it is open.