Being an animal lover, I am not one to rain down on another animal lover having animals. If you have to question..............and you are worried about your animals living like that and being happy? The light bulb should have turned on and you know what the right thing is for you to do with your chickens.
We would love to rescue more animals and add them to our small herd, unfortunately we also have a room issues and are limited to what we can keep so everyone's stays healthy and happy.
I personally would be looking at the bigger picture, you say moving is not an option for you? Have a talk with your Landlord about what you want to do, get their blessing first and you have nothing to worry about. I am guessing you already know how that conversation would turn out!
Best of Luck.