Okay, I just found this, so hopefully it will clear up any confusion:
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I have stayed in both 2470 and 2471, and they both have elevator noise problem, just not as much noise in 2471, the studio side, whereas the master in 2470 is really really bad. While I haven't stay in the dedicated 3-bedroom 2472/2473 unit before, I remember reading a few reviews that 2472 has the elevator noise problem too, but I don't know how bad since I haven't stayed in it. Like you said, 2460 is across the elevator, and I read it is okay as far as noise is concern.
So, in summary, if booking a 3 bedroom penthouse unit, you stand the chance of getting 2 possible units with noise issues, the 2470/2471 unit combo when not locked off, or the back corner 2472/2473 that is a dedicated (non-lockoff) unit. It's strange for that rear corner unit to have two units numbers assigned, but it only has one door entrance, so go figure. Although 2470/2471 can be a 3-bedroom unit, I would think it would be rare to get assigned that unit combo because I believe they probably get broken up since they get booked separately before getting booked as a 3 bedroom.
Hope that clears up all the confusion about room numbers and where. I know I can't remember well either. Hopefully I didn't provide any false information regarding room numbers before. If I did, I apologize, please refer to this post/pic for more accurate info about the 24th floor penthouse units.
Great3