A 1973 article in the New York Times says the following on the Discovery Inn:
Health food restaurants are another local specialty; we like the Discovery Inn, 156 South Topanga Canyon Boulevard; the canyon has long been a better places to shop for handcrafts. Among the specialities at the Discovery Inn are the Swinger, a kind of super hamburger filled with vegetables, and chicken Florentine. The owners bike whole wheat ions and cheesecake daily. Complete dinners are about $4.50. Reservations are necessary. (Phone 455-9079.)
Meanwhile,
a 2003 LAT article contains this:
Soon, Darrell [Hazen] was placing stuffed vultures and glow-in-the dark hunchbacks around the funky exterior of Hidden Treasures, his rambling store in Topanga Canyon.
...
In the 1960s, the store was the site of the Discovery Inn, a restaurant and gathering place for Neil Young, Jimi Hendrix and other artists who made up Topanga’s thriving music scene.
Hidden Treasures is still at 154 S Topanga Canyon Boulevard, and looks like a funky place, but the building doesn't resemble the one in
e_r's picture.