Abstract: A building structure supported by four central vertical columns fixed to the ground at vertices of a rectangle whose dimensions are much smaller than the dimensions of a floor of the eventual building. Segments of the columns constitute spreaders in upper and lower sets of trusses, each set including two pairs of trusses, the trusses of one pair being parallel to one another and perpendicular to the trusses of the other pair, and the upper and lower sets being vertically aligned. The chords of each truss extend outwardly from the columns, and the outer ends of the chords of the upper trusses are connected to the outer ends of corresponding chords of the lower trusses by generally vertical structural members by which to support, in cooperation with the columns, one or more floors of the structure above the bottom floor.