The shapes of the windows on this restaurant remind me of a Taco Bell in the town where I grew up. But this is The Bagelry, at 2575 N. Campbell. It's the east wall. The mural is signed clay gibson 01.09.
Update (March 22, 2012): I saw a note in the Caliente section of the Arizona Daily Star saying that The Bagelry has been replaced by a branch of Jimmy John's. No word on the fate of the mural.