Angel 'Shells' has anyone noticed this...

[Roadie]

I've been re-watching angel with my BF and we got to season 5 and I noticed that the one of the sets on 'shells' looks like the hyperion hotel. It's where illyria fights the gang and she opens the portal to find that her temple has been destroyed and her army is gone. If you look at the set where they fight, it is definitely the hotel! Is this deliberate? Did Joss do it on purpose? As the hotel obviously became unoccupied again when they left for W&H. Was it deliberate that illyria could only open her portal there? Would make sense since the hotel had lots of mystical energy going on such as when connor came through the portal in season 3

[Cordelia Chase]

Hmm, I didn't notice this, probably because I wasn't overly impressed by season 5.
Since the hotel wasn't mentioned by name, it's not fact that the Hyperion was INTENDED to be the location of the scene just because it shared the same set. It's not uncommon for sets to be reused.
The hotel does make sense though as it's been known to be a "hot spot" in the past as it's where the portal to Quar-Teth opened, infested the place with demon slugs and then returned Connor at the end of season 3.