> places like the bay area with a housing crisis and limited space to expand
This is the most Californian response to the problem I’ve seen. Limited space? Even San Francisco has 190 acres of vacant land [1].
You want to emulate Singapore? Consider its relative lack of single-story structures. The Bay Area’s housing crisis is a political choice made by its voters.
[1] https://escholarship.org/content/qt5gc6w0vd/qt5gc6w0vd.pdf?t...