A particularly dramatic example of this is Baltimore's Bromo tower https://www.bromoseltzertower.com/about/virtual-tour It was turned into some sort of artist studios, and as a minor architecture nerd i was having fun looking at the floor plans. The two staircases right next to each other confused me. Turns out it is that same requirement to have two independent stairwells and that was probably the least worst place to put them. Still stupid however.

Are the two elevators a code requirement as well?

See also: The Newby–McMahon Building https://en.wikipedia.org/wiki/World's_littlest_skyscraper Where they sort of want to use the upper floors. but it can barely fit one staircase, two would take up the entire floor, a building code quandary.