Abstract: The present invention relates to a circular building structure which comprises a plurality of columnar structures, each of which extends from a point below ground level to a desired height above ground level and wall structures positioned between the columnar structures and forming a substantially circular exterior wall with the columnar structures. The wall structures and the columnar structures enclose a substantially circular inner space. The building structure further includes a central hub positioned above the inner space. A plurality of trusses for supporting a roof are provided. Each of the trusses is joined to a respective one of the columnar structures and to the central hub. The inner space is divided into a perimetric space and an interior space by an interior wall which is concentric with the exterior wall. The perimetric space, in a preferred construction, is divided by walls into at least one passageway and a number of rooms.