Plenty of chins have a full double level FN to themselves... which I think is a bit larger than the townhome. Can't have too much space, that's like having too much fun. I'd just make sure as others said that you have plenty of shelves. Wouldn't want a chin to fall from the top to the bottom. Also, how old is the chin it will be for? It was recommended I didn't open up the full FN142 I have for the girls until they were older. Of course, they're only 2 months old currently. I think the main theory there was that they would use up all the energy they could be using to grow playing in a massive cage. As well as the fear that they might hurt themselves if they fell too far.