Many Baldurian main characters presumably have a home in the city already, though not all of them are likely to be very desirable. Astarion’s certainly wouldn’t be!
But yes, I also hope we get a base in the city. Though while I like it being quest-related in principle, it would need to be done in such a way as to not make it seem like a random distraction from whatever the main quest is at that point. I was always in two minds about whether the handling of bases in BG2 was successful, for example.
