Thanks for the smiles and the drool--- I haven't heard anyone mention Pepitos (didn't they have another location near the East Bay bus terminal?) for years!
You are welcome. Yes, I believe they did have a location near the old TransBay Terminal (currently under demolition for the new TransBay Terminal/CalTrain Station).
I too really loved the burrito I had there but these days I can't say if it was really that exceptional or simply seemed wonderful because it was the first one I ever had.