2. Reason: Floor 13, because Jesus was killed by the thirteenth disciple. Foreign countries think this figure is unlucky, and elevators and buildings generally don't want this figure. The same is true of the 18 floor, which represents the 18 floor of hell. I feel that this layer of yin is heavier. So nobody wants to buy it. Also, the 18 floor is a little high. If the elevator stops, you can climb to death. In addition, it is very troublesome that water and electricity will not be available for a while.
3. Supplementary explanation: As long as people are kind, hell will become heaven. Feng shui should be managed, mainly by cultivating self-cultivation.