Sagrada Familia Towers

I went up the towers about 14 years ago and seem to remember that there was an elevator going up, but I took the stairs going down.

this may answer your question:
https://community.ricksteves.com/travel-forum/to-the-west/the-elevators-in-the-sagrada-familia

I believe the way up to the top is always by elevator, and the way down by stairs.
It keeps the flow going, I suspect that is why.
It was that way in 2016, I’m sure it’s the same now.
The stairs down were terrifying to me because of the very low wall on the inner spiral, open to way below .
At that time there was no railing at all on the other, outer wall, but I saw a recent video where there is now one installed.
If you don’t mind heights, you’ll be fine.

https://youtu.be/BczPy9pBZ48?feature=shared

Look at 3’49” mark on this video to see what I mean.

Yes, elevator up, stairs down.

The stairs were, in my view, horrendous (i was 60 at the time). Tight, steep spiral, few rest places. I could hardly walk when I got to the bottom.