I boast that I have been doing Feng Shui for many years, and I have read hundreds of books, books of various dynasties, written by modern people and written by ancient people. So far, I haven't found any taboo in a professional Feng Shui book on the number 18. Therefore, the number 18 in Feng Shui is unlucky.
The only reason why the level of 18 circulated by many people on the Internet is not good comes from the legendary Rebecca and the 18 hell described in Buddhism.
In fact, many people misunderstand the meaning of "18th floor" in Buddhism. The "layer" of the eighteenth floor of hell does not refer to the upper and lower levels of space, nor to the upper and lower levels at all, but to time and content, especially time. Eighteen layers of hell determine the length of pain according to the severity of crimes committed before death.
So friends meet 18 floor, and buy if you like.