Well, the interior of the old Small Mammal building was completely redone in the 90s, to a not-especially satisfying result as noted in Geomorph's review.
The thing I don't like about Lincoln Park's new ape exhibits is that although they don't try to pretend they are anything but enclosures in a downtown Chicago park, they spent a lot of effort on some mighty unconvincing artificial "tropical" trees, "bamboo" and murals that are half-baked attempts at naturalism in an obviously artificial/architectural context. The end result is neither "Congo" nor "Howlett's," but a sort of odd mash-up of the two styles. Good spaces for the apes however--a huge improvement over the previous 70s concrete bunker.
Gorilla exhibit #1, home to Jojo's group, including his 3 females, Makari, Bahaiti, and Tabibu, his 2 juvenille kids, Azizi and Susie, and now home to the newest members of the group...
A MOTHER MALLARD DUCK AND HER FIVE DUCKLINGS!