Even though it’s a 45-minute drive from my house, I’m gonna go with Detroit as my home zoo, as it is still the closest one to my house. I believe pygmy hippopotamus would be the best of these species for the zoo, because I know exactly where they can go. You see, Detroit used to keep a single common hippopotamus in a habitat that was too small for it, which is why they phased the species out after the last one passed away a decade ago. Said habitat though, I think would be around the right size for a couple of pygmy hippopotamus, especially if they expanded the water area by a little bit. I should add that the former hippo habitat is now technically part of the aardvark enclosure, but this makes it so massive, I think it would be fine if they divided it up again.
No way would Detroit be able to get Sumatran rhinos imported, both orangutans and Amur leopards they’d potentially have room for but there would have be a lot of construction involved for new exhibit space, I have no idea where they would put giant otters, they already have African lions and probably couldn’t get Asiatic ones anyways, and there is no room for Borneo elephants or elephants or any kind.