The Federation Tower stands on the foundation which is based on a massive slab. 14 000 m3 of concrete were used to cast it; this achievement has been listed in the Guinness Book of Records.
The stability of both buildings is ensured by a heavy concrete core with footing walls 1,4 m thick and by 25 perimeter columns piercing both towers from the foundation through the top floor. The dimensions of each column base are 2 m to 1,4 m. In the Federation Tower complex every 25-30 floors there are outrigger floors made of high-strength steel structure. Outrigger floors provide additional stability to the buildings.