significant deformation the number 7 indicates he possible locations of internal walls also called separations it is a major advantage if the internal walls 7 are rigid tightly connected to the external walls and contribute to the combined rigidity of the building 39 s upper region 5 high structural rigidity is essential because a deformed building structure would adversely interact with poles 4 when the building is lifted by the flood waters and could prevent the desired amount of lifting for example as shown in fig3 the present invention building structure may be equipped with rectangular shaped hollow tube spaces 9 that permit the building structure to slide up and down without interference in relation to fixed poles 4 also having a rectangular cross section fig3 shows for example a possible solution for the horizontal cross section in one corner of the present invention building wherein a rectangular hollow tube 9 surrounds the pole 39 s 4 rectangular cross section the same corner indicated in fig1 by the letter u201c b u201d a minimum all around gap must be maintained between the hollow tube 9 and the pole 4 to avoid rubbing and possible damage in order to ensure a smooth relative movement between the building structure 5 and 6 and the poles 4 rolling contact units 13 14 in accordance with fig4 5 6 and 7 are a suggested feature of the present invention fig4 and 5 show the rolling contact units 13 14 configured for poles 4 with rectangular cross section.