A good rule for space is 4 sqft per bird in the coop plus ten sqft per bird in the run. 1 nest box for every 4 birds and about a foot of roost space each. If you do bantams you can go a little smaller.
Hello! I am an raising chickens in a very urban area also. Welcome to BYC! I am always excited to see more urban folks on this site. Are you looking for birds more for eggs and production value or more of pets with a bonus of eggs? Will they be confined to a run or be out in your yard?
I like...