according to the code for fire protection design of garages, garages and parking lots, an underground parking lot refers to a garage whose height difference between the ground level in the basement and the outdoor ground level is more than half of the net height of the garage on this floor. As long as there are no Class A and B workshops and explosives with fire danger in the basement, you can make an underground parking lot.
it is enough that the structural columns and roof of the underground parking lot can meet the structural requirements.