I have a small urban plot (total area 1/6 of an acre with a small house and garage on it) and I have room for a small flock of 4-8 chickens in a fenced area and I still have tons of room for an urban orchard and annual veggie areas. I currently have 4 chickens - all old ladies - they're valuable because they still give me yields as well as a few eggs.
I have trained my neighbors to bring me their
compost items, much of which I process through my "hen system" and some of which goes into other compost bins. So they get about 75% of their nutrition that way. I supplement with store bought feed. I only go through maybe 2 bags of feed per year with my current four hens (this is WITH the wild birds eating some as well). I *might* buy insects like black soldier fly larvae once in awhile for a treat for the hens although I'm working on a system for that at my place as well.
If you're looking for more revenue streams you might look into raising worms and selling both the worms and castings. Where I live, there is a large park with a lagoon. The local convenience store will buy fishing worms from me to
sell to people who visit the park. They even have a special mini-fridge for the worms.
Honestly, I think you would have room
enough to run some hens and they give back lots of yield in the form of eggs, meat, chicken
poop (people who grow roses LOVE chicken poop) and they process waste from the garden into some fabulous compost. What I don't use in my own
yard, I have sold - you get a good price!
Dried stalks of grains are also a big seller for decorative accents around Halloween/Thanksgiving.