I have been driving by this unique garden and home for decades. It is on the road to Malibu. I use Topanga Canyon Boulevard as an alternate route from West Los Angeles when the freeways are shut down due to fires or serious car accidents.
Finally I decided to stop a take some photos. The garden is listed on Yelp and Yahoo. As it happens the adjoining house is For Sale. Thus there are real estate photos on line. Asking price for this 4700 square foot home is $1.2 Million. Four bedrooms and four full baths on a .44 acre lot. The house was built in 1931.
There appears to be an abandoned road next to the corner as shown in the first picture. Notice the flirtatious Cupid. Clicking on the pictures gives you a better view.
Location map
My photos all taken with my Panasonic DMC-FZ150:
Heading south as you leave the San Fernando Valley:
Heading north entering the San Fernando Valley from Topanga Canyon:
Real Estate listing photos of the house. Repaved the street and glossed the photos all thanks to Photoshop
Coast Contact 
I’ve driven by this location multiple times and wondered about the property. Thanks for sharing the photos!