In this photo from 1926, we’re looking north toward the Hollywood Hills on Genesee Ave (which back then was Genesee Street—I wonder why they changed it?) I find it striking to see how clean and clear the streets are. I don’t know when the streets were paved and the curbs and lights and trees were put in but from the look of this photo, I’m guessing not too long after this photo was taken. (My thanks to David G for helping me ID this location.)

More or less the same view in December 2017:

David G says: “Re the Street/Avenue naming issue, at some point Los Angeles attempted to standardize the general convention that east-west thoroughfares were “streets” and north-south thoroughfares were “avenues” (with many exceptions). The 1954 Interstate Highway Act did something similar: east-west highways were even-numbered (e.g., the 10 and the 8), while north-south highways were odd-numbered (e.g., the 5 and the 95).