Very expensive capped off drill sites.....go figure, a hill top in a desert first makes millions pumping out oil then sells for millions for luxury living......
Found where you took off from www.google.com/maps/place/Hidden+Hills,+CA+91302,+USA/@34.1411187,-118.6711724,219m/data=!3m1!1e3!4m5!3m4!1s0x80c29e0821d3f27f:0x23f77ab3938439aa!8m2!3d34.1648798!4d-118.6647537