The thesis is focused on the opinion of an office building from the perspective of two different standards and comparing their approaches. These standards is a currently valid European Standard EN 1992-1-1 (EC2) and standard according to US standards ACI 318-11. In this work were considered pillars in the second basement and on the first floor. Was also assessed locally supported slab above the 1st floor and staircase connects the individual floors. All the completed elements were assessed according to the 1st ultimate limit state.