I've never seen that before, but it looks like one of the best I've ever seen from that period (All pics from the US tour in '69 are classic). It's as though the shadows of Altamont are already creeping in on them in this pic. Very cool stuff.
Think it's Laurel Canyon, and I believe that some of the band were hanging out at Stephen Stills' home on that swing through town. Laurel Canyon is in the mountain that divides Los Angeles from the San Fernando Valley. On the L.A. side, it ends at the Sunset Strip.