Actually, the east/northeast LA basin (i.e. San Gabriel Valley, etc) is still quite reasonably-priced (in comparison to SD County) but is currently appreciating fast.
This is because the last single-family home tracts in these areas were built in the very early ’80’s with the average single family home circa 1953-1964. The LA County Board of Supervisors (very wisely) did not sell out their beautiful wide swaths of open space to Big Development’s endless subdivison permit requests, thereby creating “Community Facilities Districts” as did the (greedy) SD County BOS. Therefore, I haven’t noticed any Mello-Roos-encumbered tracts there.