Patent ID: 8104232

Claim:
A rotatable building structure that comprises: a vertically extending building having one or more floors; a fixed core support for supporting the building, located substantially centrally beneath the building; a rotatable annular drive system for rotating the building, located lower than the building and with its centre substantially aligned with the vertical centreline of the building, the system having an upper surface and a planar lower surface; and a fixed outer support, located beneath the annular drive system, the support having a planar upper surface that contacts the planar lower surface of the annular drive system; wherein at least one of the lower surface of the annular drive system and the upper surface of the fixed outer support comprises a bearing material, permitting rotation of the annular drive system over the fixed outer support, such that the annular drive system is rotated via a planar to planar bearing system, wherein the annular drive system comprises an annular drive ring and two or more drive means for turning the drive ring, wherein there are drive means located both inside and outside the drive ring.