My understanding was the US was not doing this to the extent China was. There construction projects to build ghost cities.
I love California, and would like housing there.
Plenty of houses in Detroit
Why 50 Million Chinese Homes are Empty - https://www.youtube.com/watch?v=f5SE47Xjx2Q&t=2s
https://www.bloomberg.com/news/articles/2019-10-08/powell-sa...
This has nothing to do with ghost cities (which can probably be blamed on bad central planning and an overheated property market in China).