That takes a very high income, along with thrift, or selling a successful business. I can bag it all now, but choose not to, but it took about 25 years of working to get there, with what I am comfortable with as critical mass. These days, I don't see how folks without very high incomes, will ever get there in some parts of California.
I left California in 1973. I presently live on Mobile Bay instead of SF Bay. I drive an old Buick and a Ford Ranger, nothing too fancy but, comfortable.