At the back of the building the columns have cracked at their base, the concrete broke, leaving the steel apparent. These steel bars have been twisted by the force of the quake.
This video shows the worse of the damage: one of the central pillar, holding the roof, collapsed. The roof structure has been weakened, the adjacent columns have cracks in their base and in their top and are leaning. The office building has sunk a little bit in the ground. If it rains it will sink a little bit more and pull the roof down.