Abstract: A movable wall assembly is provided to selectively partition an interior space. The assembly includes a base member having support elements therealong, and a leveling support bar on which the partition is assembled overlying the support elements and adjustable with the support elements to effect leveling thereof. Wall panels are supportably mounted on the support bar, being maintained in place by slotted support post members between the wall panels which engage the panels. The post members are secured to the support elements on the support bar, and to tie pieces extending between adjacent panels along upper edges of the panels. A method of leveling the movable wall assembly is also provided whereby the assembly can be leveled prior to mounting and securing the wall panels on the leveling support bar.