ziller 13850
https://www.zillow.com/b/13850-Leffingwell-Rd-Whittier-CA/33.921027,-118.036046_ll/
ziller map
https://www.zillow.com/homes/for_sale/condo,apartment_duplex_type/globalrelevanceex_sort/33.923493,-118.031885,33.921321,-118.037051_rect/17_zm/0_mmm/
la county FAQ
http://planning.lacounty.gov/gis/interactive
la county zone list
http://planning.lacounty.gov/luz/summary/category/residential_zones
land-know-how
http://www.ccyp.com/articles/1697/%E6%8A%95%E8%B3%87%E5%9C%9F%E5%9C%B0%E8%88%87%E7%82%92%E4%BD%9C%E5%9C%9F%E5%9C%B0%E6%98%AF%E4%B8%8D%E7%9B%B8%E5%90%8C%E7%9A%84