Our first encounter with this bird's eye view "perspective" map for southern California, particular to LA county. While we can not find an attribution to a specific artist or mapmaker, it feels pretty clearly to us that it is the work of Charles Owen, a pictorial mapmaker active mostly in the 1930's and 40's who created a number of different thematic birds eye map. This copy appears to have been created by a blue print process and while good, loses detail and crispness in its detail.
Condition is good. Image size is approximately 11.5 x 22 (inches)