It’s just the project growth for SoCal, L.A. is out of build-able land and has been for a while.
Sure some of that will end up being in Riverside county but they will be commuting into SD one way or the other.
Population growth is expect to accelerate as well in the USA over the next 30 years.
(going from 300 mill to 400 mill)
Year Projection Actual result
2010 310,232,863 308,745,538
2020 341,386,665
2030 373,503,674
2040 405,655,295
2050 439,010,253
Charlton Heston said it best maybe in a 1970’s movie.