Simi Valley has a lot of biotech spin offs from Amgen (as well as the movie industry, yea I get it).
There are quite a few Communications and computer industry start-ups there as well (and westlake area).

Buildable is being redefined these days but when I look at the large track of vacant mostly flat or small hill along the 76 and east of the 15 along the 78, there is a lot of room L.A. would die to have.
Look at the large home tack planned along the I15 near dear springs road and tell me that would be easier to build on than the land along the 76. (I think that has 2500 homes in the plan community in those hills).

Laugh if you want but wait 20 years and we will talk of this again.