The end of the building is an open room and approx.12ft./26ft. Its a 48/26 ft.building and the rest of the line of sight (36ft.)is wall and doorways, the crack is not the buildig center line but what looks like (3) 2/6 joined and running from the wall line to the end of building.(it looks to be running from one side of the (3)2/6.
the crack is at the most, 1/32 in. and not changing
the center line of the building is the hall with rooms on each side.