Thut’s Elevators is quite old mod for Minecraft, which adds the ability to create your own elevator. An elevator can work for 64 floors, that’s enough for a skyscraper. In addition you get a few useful items with which you can install a special button on each floor. Now you can destroy the stairs, they will no longer be useful.
Thut’s Elevators screenshots:
How to build an elevator?
Just watch this video here shows his work.