Why don't many buildings have 13th floors?

Many buildings don't have 4, 7, 13, 14, 17 and 18, because 13 is a very unlucky number in the western tradition. 4 and 7 stand for death and go respectively, which are taboo for China people, and 18 stands for 18 levels of hell. These are the "wisdom crystallization" of the so-called modern real estate geomantic omen, in fact, people deceive themselves. But for many southerners (friends from the south don't hit me, I'm telling the truth), especially those who are good at real estate speculation in an economically developed city in Zhejiang, I have come into contact with many people, and they all pay special attention to this thing. As a result, the developers have no choice but to replace the fourth floor with 3B and 3F, and so on.