Hmmm.. found this interestin... How t'hide an Aircraft Factory...

A litle bit of L.A. history.

How To Hide An Airplane Factory

During World War II the Army Corps of Engineers needed to hide the Lockheed Burbank Aircraft Plant to protect it from a Japanese air attack. They covered it with camouflage netting and trompe to make it look like a rural subdivision from the air.
Before: