Abstract: A multi-storey building is erected over an appreciable area on which it is either not desired or possible to build directly. The building consists essentially of a load bearing frame which spans the area without any intermediate supports and on which the storeys of the building are erected. The frame comprises a number of axially spaced arches and two series of staggered giant steps between each pair of neighbouring arches, the two series being on opposite sides of the apex of the frame and each step being formed by at least one concrete slab and being fixed to its adjacent arches. The storeys of the building are formed by a large number of individual accommodation units which are erected on both sides of the frame. Each accommodation unit is formed in part by one or the giant steps, and usually, each unit will be overlapped to some extent by the unit which is erected on the next step up the frame so that the storeys will appear to be generally staggered up each side of the frame towards the apex.