I would imagine that some well-angled mirrors near the top of the building can greatly increase the amount of light that goes down that hole.
The key here (I assume) is that it is a 90 year old skyscraper (according to your parent) and those older buildings are, generally, easier to convert and have a smaller floor plate, etc.
Of course I have no idea about this particular building but word on the street is, older office buildings have a better chance of being good candidates.
Older office buildings tend to be geared towards small offices for smaller businesses, like small law practices. Modern cubicle farms are much larger, open offices even more so.
Also, older regulations on building forms pre-war required more setbacks at taller heights, creating the “wedding-cake” style tower common during that time. The modern glass box is generally wider.