Apologies if this house has been discussed before, but I found the card on Ebay earlier, and would like to know more about it. It's titled "Vintage Los Angeles House Real Photo Card", but what caught my eye was the unusual wrap-around details on the roof. The seller dates it as 1930-1940, and the photo credit on the back is "Graham Photo Co., 110 So Broadway, Los Angeles, Cal., U.S.A.", but no location is given. The number by the door looks like 86, which may narrow down the possible locations.
Ebay
The City Directories give various addresses for the Graham Photo Co.:
1923 - 110½ South Broadway
1926 - 121½ South Broadway
1929 - 321 W 3rd Street
1932 - 2937 Whittier Blvd.
So it's probably fair to assume that the photo above may be earlier than the description suggests.