Here is an bit from the May 2009, email from Margaret which shows the influence of a neighborhood association.
" Several weeks ago I attended the Del Aire Neighborhood Association meeting.
...it was discussed what will happen to the median strip at Aviation. The olive trees will be relocated to another Los Angeles city and in its place Catalina Ironwood trees will be planted. The Neighborhood Assoc. was adamant that only Calif. natives be planted. In fact they turned away a shipment of some east coast trees. The renovation is being headed up by Anne Kershner. Should start in the fall."
- Posted at great expense from my iPhone