A shiftable frame for accommodating movement of structural portions of a building that secure the shiftable frame, the shiftable frame comprising: a first frame section (110a; 110a') including a plurality of first vertical supports and one or more first horizontal supports (140,150,160); a second frame section (110b;110b') including a plurality of second vertical supports and one or more second horizontal supports (140,150,160), the second frame section (110b;110b') opposing the first frame section (110a;110a'); one or more brackets (120, 120a, 120b, 120b', 120b"), each of the one or more brackets (120, 120a, 120b, 120b', 120b") having a first end thereof pivotally connected to the first frame section (110a; 110a') and a second end thereof pivotally connected to the second frame section (110b;110b'); wherein one or more of the first frame section (110a; 110a') and the second frame section (110b; 110b') includes connection features connectable to corresponding features of a panel characterized in that the shiftable frame further comprises one or more yokes connected between the first frame section (110a;110a') and the second frame section (110b;110b'), the one or more yokes being connected to respective ones of the brackets (120,120a,120b, 120',120b") and being configured to rotate upon relative movement between the first frame section (110a; 110a') and the second frame section (110b;110b'); and a connector rod and one or more knuckle brackets (170a,170b) movably connected to the connector rod, the one or more knuckle brackets (170a,170b) being connectable to one or more support structures, wherein, furthermore, the connector rod is disposed at least partially within the one or more yokes to limit lateral movement of the shiftable frame. a first frame section (110a; 110a') including a plurality of first vertical supports and one or more first horizontal supports (140,150,160); a second frame section (110b;110b') including a plurality of second vertical supports and one or more second horizontal supports (140,150,160), the second frame section (110b;110b') opposing the first frame section (110a;110a'); one or more brackets (120, 120a, 120b, 120b', 120b"), each of the one or more brackets (120, 120a, 120b, 120b', 120b") having a first end thereof pivotally connected to the first frame section (110a; 110a') and a second end thereof pivotally connected to the second frame section (110b;110b'); wherein one or more of the first frame section (110a; 110a') and the second frame section (110b; 110b') includes connection features connectable to corresponding features of a panel characterized in that the shiftable frame further comprises one or more yokes connected between the first frame section (110a;110a') and the second frame section (110b;110b'), the one or more yokes being connected to respective ones of the brackets (120,120a,120b, 120',120b") and being configured to rotate upon relative movement between the first frame section (110a; 110a') and the second frame section (110b;110b'); and a connector rod and one or more knuckle brackets (170a,170b) movably connected to the connector rod, the one or more knuckle brackets (170a,170b) being connectable to one or more support structures, wherein, furthermore, the connector rod is disposed at least partially within the one or more yokes to limit lateral movement of the shiftable frame.