i know the feeling, can't have a pond here either.
i looked into raising fish in barrels or IBC totes seem to work pretty well with catfish and tilapia.
am not urban, but rabbits are usually classified as pets not live stock, i would like to get into them but still have a hard time killing livestock. (yet no issue with wild game) they seem to provide a lot of meat in a small space and minimum effort.
also have you looked into fish? like small...