Manhattan seems to have more staying power for vegan places than LA - our double zero branch is still here and new vegan places like neat burger have been opening. Not sure why, though
https://www.happycow.net/north_america/usa/california/los_an...
https://www.happycow.net/north_america/usa/new_york/new_york...
And with the geographic distribution of the 2 cities Manhattan probably has a much higher concentration as well.