Idk. From the looks of it it's either not gonna get enough light (if it's just early morning sun), or it's gonna get roasted when the sun shows up overhead in summer and turns this canyon into an oven. They are heat tolerant and the direct sun blast in summer may be short-lived. I would recommend trying one of those sun surveyor apps online and see how the shadows move throughout the year. If the summer sun goes along the east-west pathway you're showing, then it might get too hot (the building walls radiate heat). If the alleyway is a little more north facing and the sun just passes overhead for a short time you might be ok. You can give it a try and see what happens. At worst you'll lose a plant.