My office is a former slab-on-grade warehouse that was converted into offices, laboratories, and manufacturing halls. They installed eight multi-stall bathroom

My office is a former slab-on-grade warehouse that was converted into offices, laboratories, and manufacturing halls. They installed eight multi-stall bathrooms where once there was a single room in the corner with one toilet through the revolutionary act of running PEX and digging a trench in the slab for sewage. It is trivial to do the same in a high-rise. If anything it will be easier because instead of digging a trench you can punch holes in the floor and route plumbing and ventilation through the plenum (or whatever is up there). Water supply and power isn't a problem because here's a secret: commercial spaces almost always use more power than residential, especially in the extremely esoteric and rare cases where workers have computers and copiers. Hell all of these buildings have phat 3-phase service. A dude watching Netflix and using his microwave in a space that once housed a dozen workers, half of which had space heaters under their desks because the HVAC was set to 70 in the summer will be a break for the transformer.