This "hidden" Starbucks is located at the Elara Hilton Grand Vacations hotel. However, I stumbled on it by finding an entrance in a far corner of Planet Hollywood's Miracle Mile Shops (to find it in Miracle Mile, look for and follow the Elara signs).
From first glance this Starbucks caught me eye; it's visually stunning. The walls on both sides are all glass, floor to ceiling, it just grabs you and makes you want to take a closer look. Inside, the other all glass wall faces the beautiful Elara pool environs, a calming sight for caffeine contemplation. The glass front and rear walls make for an arresting see-through effect.
Another bonus: this site shares a contiguous space with an Elara bar. When I was there on a weekday morning, the bar was closed, but all the bar seating was available for spillover Starbucks seating! Also, according to the Starbucks website, this Starbucks is open 24 hours.
Hard to beat an attractive, always open Starbucks - it's worth the extra effort tracking it down.