Store fronts meet at a corner, wall won't cleanup correctly

[Fishmonger]

What is the best way to get the "extra" piece of wall out of my corner when
two storefronts meet at a square corner mullion?
I have the windows aligning correctly but a small piece of the wall remains
at the very end, obscuring the elevations and showing up in plan.

Dick

[bowlingbrad]

Please post a purged file with the offending elements.
Thanks

[PaulB]

Do a search on this as there was a reply only in the last fortnight or so.

[Fishmonger]

Thanks to those who offered suggestions. The recommended previous posts
solved another issue, but my original question went away when we went through
a redesign. We're in SD's on this one.
Special thanks to tomdinmn whose local expertise I have come to rely on heavily.