Start at https://www.zillow.com/los-angeles-ca/home-values/ and use various zip code queries at the top bar. The year-by-year plot is at the bottom.
https://www.breckenridgeassociates.com/statistics.php
Their reports show data going back to about 2000. It's interesting to see the rise and fall of inventory levels, days-on-market, price per square foot, etc., as the economy has gone up and down. They also break it down by housing type, so you can, for example, see the changes in condo stats separately from single-family home stats.