Business Center 1 ОАО "Сургутнефтегаз" in Surgut, Russia, has 20.000 m2 in area. The building was constructed in 1994. Floor slabs are monolithic, pre-stressed, produced in a package and thereafter lifted to the designed position by method of large-scale elements erection. The grid of the structure is 7,20 x 10,0 m.