I'm not a table mechanic, but I have a GC4 in my apartment and its right next to me.
The longest piece that can't be further broken down are the skirts at the side of the long rails. I just measured, and they are about 111" long x 9" wide x 3/4" thick. If your elevator was not tall enough, they may very well fit on the diagonal.
If still too big, there are only two of those pieces, and they each probably weigh about 5-10 lbs. So if you really did have to carry them up the stairs, should not be too bad.
The next longest piece is the long frame members. They are 84" long. They should fit inside any elevator, I would imagine. You wouldn't want to carry them up the stairs, as they are large timbers.
As far as a pool table in apartment life, I would personally keep your mouth shut, don't tell management anything. Get a drop pocket table (they are quieter). Put a sock inside the bottom of each pocket (quiets it further). When you play, soft break 9 ball. Or play a lot of straight pool. Try to play during the daytime hours if you can, when most people are working. (well, before corona anyway). Play some music while you play. If you do all that, the neighbors may not catch on that you have a table. The goal is to not have them complain to management about any loud noises, and then management might give you a fit.
I did all of the above to keep the noise down, and in 8 years of a table inside my apartment, I never had any issues with neighbors or management.
YMMV
