I took a trip to snoop on the Tejon Ranch RCS, but decided to explore
the Broken Arrow Ranch route than than the viewing location towards
the south that you access from Rosamond. The spot I picked is used to
reach power line for LA water and power. Unfortunately, the view isn't
very good, though you are quite close to the Tejon ranch.

http://www.lazygranch.com/images/tejon/tejon_lapower.jpg

A jpg2000 version of this shot is at
http://www.lazygranch.com/images/tejon/tejon_lapower.jp2
You need to load the link from something other than IE (probably
firefox for most people). You also need Irfanview to view a jp2 file.

I used a 400mm lens and a 1.4x teleconverter. I ran into a very clean
truck that said "Ranch Security" on the side. Clearly, this is not the
truck of a rancher. So I assume Tejon ranch has a remote camera or
some other detector. I played at and mouse with the guy. He pulled off
and parked to watch me, so I pulled off and parked to watch him. He
then proceeded through the gate to the RCS, presumably parked there
waiting for me to do something stupid. I took the road to the power
lines instead.

I don't have the waypoint handy, but I took some shot with just the
400mm lens a few years ago.
http://www.lazygranch.com/images/tejon/tejonwide.jp2
You take Rosamond west until it takes a sharp left turn, but at a
location where you kind of keep going straight on a dirt road. You
eventually reach a gate which I believe also goes to the Tejon Ranch.
Park at the side of the road before that gate, and there is a trail to
your right. Hike about a mile in and you can see the whole ranch. You
will really need a telescope to see anything with detail.