If you live in LA you'll need to go over at least one highway.
Edit: ITT many Americans telling me of how walkable and great their towns are. I'm happy for you but comrades, I've been to the US once and that was on a trip I won in high school so don't expect me to know the zoning plan of Providence, Wisconsin Pop. 235'489. I don't really care how lovely your city with two buslines is. For every Seattle or Chicago there are 34 Cincinnatis, Houstons and Las Vagases and approx. 234 exurbs and suburbs.
Are there spaces for market gardens available? Who owns them, and how would they react if their land was used?
what? no, its a complex squeezed onto a mountain abutted up against a military base & even if they did open one it'd probably get burned to the ground by the cops
That's a shame. How about roof top gardens?
its 100% built out, crammed between a base & a port, on the side of a mountain there are no empty lots