Be surprised, I guess - https://www.nyc.gov/site/lmcr/progress/battery-coastal-resil...

This project in NYC has been going on for a bit. The difference is LA has a GDP of about $340B+, while NY has a GDP of $2.3T+.

The Whitney museum has a whole system for putting up flood walls around the perimeter, plus the ground floor is just the gift shop.