Is it illegal for the evacuation stairs of high floors to be occupied by the property?

This is illegal. Compared with buildings with elevators, the so-called evacuation staircase is to evacuate people in an emergency. Of course, it can also be used under normal circumstances, and there is no restriction on the circumstances under which it can be used. However, articles cannot be placed in the passage and the entrance and exit of the passage cannot be closed. To keep the passage unblocked, the stairs are generally evacuation stairs, and articles cannot be placed in the passage.