Abstract: In a building, reinforced concrete wall panels are bolted to each other and to the floor and roof to provide the outer shell of the building. At the bolt holes in these wall panels a rigid reinforcing rod framework, which is cast in the concrete panel, provides at least one pair of rods passing respectively on opposite sides of each bolt hole to reinforce the panel there. Certain of the wall panels have window openings for receiving standard size, aluminum frame windows. Others of the wall panels provide doorway openings for receiving standard width doors. Preferably, at each outside corner of the building a special corner wall panel is provided.