Abstract: A three dimensional geometric structural framework made up of subassemblies of cross members connected by end connectors. The subassemblies are then interconnected with clip members. The cross members have a cross section providing protruding triangular arrowhead corners and the clip members are shaped for engaging and retaining the arrowhead corners of juxtaposed cross members together in fixed relationship.

Abstract: A cantilevered wall and foundation unit particularly useful for supporting a building constructed on a hillside includes cantilevered side walls and an inclined rear wall. The cantilevered side walls include a support section and a cantilevered section. The foundation unit can be constructed in place or, in part, at a location remote from the excavation area. The rear wall can be planar, can include a section having the shape of a portion of a sphere, or can include a series of steps. The sidewall can be used to underpin an existing structure.