Abstract: Steel frames formed of rolled steel I-beams are connected by steel framed wall panels spanned by steel studs, and covered by steel framed roof panels spanned by steel purlins, making a structural frame completely formed of steel components bolted together. All components are precut and predrilled before transport to a construction site. A crane is used to raise steel frames and steel framed roof panels into position for bolted assembly, reducing construction times to absolute minimums. Entire structure is virtually lightning-proof, wind-proof, and earthquake resistant.