I'm not in favour of housing a variety of animals in a shared enclosure simply for cleanliness, disease and pest management.
Similarly, the cleanliness and possible disease history is an unknown. Since the coup has seen a lot of use, I'd:
1. strip the walls and any old insulation, built up muck, manure, etc and re-sheet the interior with whatever is available and easy to clean/maintain.
2. Hose and scrub the concrete
floor with detergent then a strong bleach solution, discard the old perches and make new ones - paint them with a few coats of oil (I like linseed oil) to reduce mite infestation. Ditto with nesting boxes.
3. White wash all exposed timber. It looks like it is well ventilated and sunlit, so that's a bonus.
4. The photos show some very old electrical wiring? If it's still functional, important to renew that to prevent an unplanned BBQ!
A bit of labour now will deter a lot of regret later if disease affects the livestock.
No doubt the new tenants will be grateful for the renovation.