Looks good so far.
I'd suggest a few main avenues, very wide, with a median with trees and paved.
Along these streets have skyscrapers mostly made of glass, with a sprinkling of older stone buildings. I don't know if you're building with mods, but I think it's Tinkers Construct that adds these great sandstone bricks that are perfect for that sort of thing. At the focus point of your city, have a few very tall, very new buildings that are nearly as tall as the mountain.
A river or two could be cool, and in the affluent sections have a boardwalk or riverwalk.
Don't forget public transportation, Minecart subways or L's.
My suggestions are based on Chicago, which I visit quite often, while I have never been to L.A., but maybe you can use some of the ideas anyway.