Surprised this hasn't already been posted - But Jared Leto from hollywood nonetheless (and 30  seconds to Mars) has been the first person to legally scale the Empire state building. Presuming there's been a few illegal ascents over the years. Alain Robert perhaps?

https://www.bbc.co.uk/news/entertainment-arts-67380226

Would have been cooler if he’d done it in his cat costume…

https://www.gq.com/story/met-gala-2023-jared-leto-cat-suit-choupette

Curious if it was done on a 350m top-rope as it appears.

I'd have though the potential danger due to rope stretch during a fall would be significant...

It's not like him to go for a big attention-grab!

Guy's a creep. 

It would be on a normal climbing rope, or even a static/semi-static/LSK. 

If was a single very long top rope with no Bear Grylls style camera trickery, my guess is that it would probably have been a dyneema yachting rope with some mechanism at the top to provide a dynamic belay for shock-absorption instead.  (Possibly something quite technological, possibly more old-school along the lines of very skilful belaying using a fairly slick device and great care to ensure that there's never any significant slack.)

This is the kind of thing I'm thinking of - very strong and extremely un-stretchy.  You'd be bonkers to use this to climb on normally, but it is sometimes used for film/TV stunts and the like:  https://www.shopusa.marlowropes.com/en-us/d2-racing-dr

Or did someone else do the leading, only for Jared to bag the top-out pitch and claim the first ascent?

I remember reading an account in an American mag - maybe Climbing or R&I - about Jared Leto doing Royal Arches in Yosemite. I had no idea who he was then, and strangely enough, still don't.

Top roped the last 20 floors, 200m

High ceilings.

Who knew?  Me. 

He was right next to me at The Castle one afternoon a few years back, not a bad climber, nothing special but not bad.

He had a cringe and self-indulgent climbing video series on youtube a while back where he was at his obnoxious best (did a lot with Honnold).

Worth noting, for anyone who doesn't know, that he has sexual misconduct and assault accusations from young women and underage girls stretching back decades. 

He also runs cultish retreats where he is treated as a messiah (and also sharks on young women).

Or that's what I've heard