I didn't think so, although that would make more sense. ZTL has the Guerezas as part of the wider Skansen collection. I assume you've been to Skansen but for other interested parties this enclosure is opposite the Akvariet. Along with a small mixed species African aviary this is the only non Scandinavian exhibit outside the Akvariet, which is a separate entity that you pay to enter.
Hmm, interesting. They don't appear on the Akvariet's website either, at least as far as I can see, but they aren't "claimed" by Skansen's website either. Can you see any of the Akvariet's other species without paying? The Lemurs and Baboons are outside aren't they? I can't remember too well though.
The colobus monkeys are a part of Skansen, not Skansen-Akvariet. Here's a link: Om guerezaapor på Skansen, se fler exotiska djur. | Skansen i Stockholm The only animals from Skansen-Akvariet you can see from the outside are the ring-tailed lemurs, where you can see inside the walk-though cage, and one of their "jungle exibits" which when I was last there had golded lion tamarins, pygmy marmosets and green iguanas.
The building used for their indoor accommodation used to be the elephant house. It housed elephants from 1960 until 1992 when the two Asian elephants left for Cricket St Thomas.
Wow. I was impressed with the size of the indoor exhibit, it seemed very big for monkeys, especially compared with their indoor quarters at the Akvariet. I had no idea it used to hold elephants though, wouldn't have seemed as spacious for them I'm sure.