Some of the concerns I’ve seen are that while electrical should be fine for the type of stuff America uses 110v for, overkill even, the plumbing is all in the wrong places and likely inadequate for how many people will need showers and baths, the HVAC isn’t really meant for the granularity people would want, and it would be a challenge to get the ventilation and heavy duty circuitry to every unit to safely allow for cooking.
What I do think they could do is convert to dormitory style housing with shared kitchens and baths, and while that limits your target audience, it limits it to the people most in need of affordable housing. Refurbing existing office blocks is certainly not a panacea, and I am already cringing at some government that thinks it would be, but I don’t think we’re too far off from denser cities considering it in some cases. I think the bigger opportunity is in new builds and more drastic redevelopments. With very few exceptions, I don’t think any urban core needs to be building dedicated office buildings anymore. Seems it would be way easier and sufficiently cost effective to allow for conversion later even if it’s not in the plan now.