4'x5', once you cut out the nest box space that's a 4-6 chicken coop, tops. The bottom run is nice for when the birds wake up and you can't let them out first thing or during inclement weather IF you invest a little extra to give it a dig proof skirting.
But at that price I'd just make one myself. It'd cost WAY less.
But at that price I'd just make one myself. It'd cost WAY less.