I have a feeling this is the Nickelodeon studios soundstage, as those set pieces look a lot like those from Legends of the Hidden temple, a kids gameshow filming at the time. If so, that entire space is now a theatre for the Blue Man Group live show.)
It wasn't, it was another show attraction. I can't remember what the show was called now, but I'd been there in November 1996 and it was fresh in my mind when Noel broadcast his show from there. I remember being quite excited to see the show coming from somewhere I'd been myself not too long before.
You can see the windows in the pavillion and daylight coming in, which shows it wasn't coming from a soundstage.