Why are there no floors 13 and 14 in the office building?

Some developers or customers are afraid of the number 13/14/24, so they will use data with letters like 12A/ 12B instead, but it is actually13 and14 floors. In fact, not only the office building, but also the house. Sometimes you will find that there are no four buildings of 14 and no four floors of 14. In the final analysis, it is the taboo of developers or customers, and there is no other reason. As long as you don't care about this figure, it doesn't matter, so the price of office buildings on that floor may be cheaper.