I wouldn’t discount Jim’s “fake” wall theory but I think there was a structure behind and it probably disappeared long before any listing the building may have.
It can just be seen from Leodian’s photo looking along New Briggate that there are 3 “gable ends”. One over the bar, a larger one over the massage parlour former;y a hairdresse and another smaller one over what on streetview is a takeway called Raja’s adjacent to an alley between it and the Grand Theatre. There is a degree of symmetry in that the two outer gable ends are of the same width. Also if you look at the aerial (satellite) view the roofs on the right and middle gable ends extend back approximately the same distance and consistent with where the roof would stretch to on the left gable end were it to extend the full length of the wall.
If you look at the Vicar Lane end there is pretty much an identical set of gable ends and roofs stretching back the same length.
Things that distort the symmetry other than the shorter roof at the New Briggate end. The “diagonal” frontage on New Briggate means the building is more a parallelogram than a rectangle at this end. Also the left end has the turret structure on the corner which could have been a later addition given the brickwork is different.
I suspect that there once was a room behind that wall and that room was demolished or shortened when the large roof that covers most of the northwest quarter was constructed. A couple of Leodis photos suggest that the Tower Cinema was converted from the Grand Arcade when it opened in 1920 and presumably the glass roof covering the rest of the arcade was replaced then. http://www.leodis.net/display.aspx?reso ... 0_20061892
The Arcade was a complete H shape for the first quarter century of its existence but the Cinema would obviously need a higher light proof roof. I suppose it’s possible the roof could also have been raised higher when the Tower was converted to a nightclub in the 80s