Ghost Alley Espresso is located right outside of the bubblegum wall.
There is no seating inside; it is walk-up only.
They offer oat milk and several sugar-free syrups.
A few nearby places worth checking next.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.