[beerandt]

The fact that there's a shadow at the top for the wall, but not on the right side tells me it's not covered with anything solid. (Compare to the shadow of the other building.)

Look at the top of the wall shadow. The canvas/whatever material isn't attached at the peak and is sagging, and you can see the shadow of the top portion of the arch above it.

I'd say they pulled the cover back to the end and it's hanging over the side.

Actually, that's probably not even be a 'wall' shadow, but just the roof covering hanging. Which would sag but otherwise look like a wall.