There's a small farm and coops for sale next to the "Born with Insight, raised with a fist" mural at the corner of 11th and Mandela in West Oakland.
There isn't a sign on the farm (except a sign that says "coops for sale"), but there are many chickens, goats, bee hives, and sometimes a cat.
There's little mention of the farm on the internet, but this blog post highlights it, this blog post might be talking about it when it refers to "our friend Maurice's urban chicken farm oasis on Mandela Parkway @ 11th Street, West Oakland," and you can see the coops on google streetview.