Abstract: The building is to be constructed of a plurality of interconnected building panels. Each said building panel is to be of a square or rectangular or other convenient polygonal shape and is to include a plurality of corner members with each corner member including a pair of openings, the longitudinal center axes of which intersect. The corner members include a web section which is to be connectable with a brace assembly. An end of an elongated tubular member is to be telescopingly located within each opening of a corner member with the arrangement of the elongated tubular members forming an enclosed area. There is to be a pair of separate brace assemblies located in a crossed arrangement across the enclosed area. Each brace assembly is composed of a pair of members which are interconnected together by a turnbuckle for the purpose of adjustment. Each corner member is constructed of two identical members assembled in a mirror image relationship and welded together.