I can't find it now, but I've seen a great video of a fella with maybe a quarter acre with a smallish house but it's entirely devoted to food. There are fruit trees and berry bushes around the outside, accessible to all from the sidewalk. Small corn and potato patches, plenty of of other fruits and veggies. I remember him grabbing some artichoke and a basket of random veg for the day's meal.

Just a very dense garden. It was a great video tour, I wish I could find it.