It doesn’t matter what you’ll “take”. It’s illegal to live in a building that doesn’t meet code for residential units. Stuff like natural light as well as adequate plumbing and ventilation are important.
And they wouldn’t just be converting entire floors into single units. Those would be beyond luxury sizes. You think a 50 storey building can afford to become a 50-unit apartment? How is that going to solve our housing crisis? Don’t be dense.
For a conversion to work, they would need to be able to convert every floor of an office building into sufficiently dense housing. But office buildings are typically laid out with very deep footprints, where much of the internal layout of the building is far from any sources of natural light. Humans need access to natural light, which is why it’s not legal to sell a unit where the main rooms don’t all have windows. That can’t be fixed without tearing down the building and building something new.