It's not unthinkable, but it's also just an example of one of the many things that need to be done to adapt. You'll need to install separate electric service t

It's not unthinkable, but it's also just an example of one of the many things that need to be done to adapt. You'll need to install separate electric service to each unit unless you want to share an electric bill with your neighbors. You'll need separate HVAC unless you want to have one common thermostat and keep your home at the same temperature as everyone else's. You'll need walls, and they really ought to be built to block some sound. You need walls that separate units, and each unit also needs internal walls since you probably want things like bedroom closets which office buildings don't usually have. You're going to want a kitchen with cabinetry, appliances, and plumbing for sink and dishwasher. Since you're building all that, you can just add plumbing in while you're doing it, either inside those walls you're building or along the ceiling.