>Put another way, what matters is the maximum volume the electrical, sewer, HVAC, elevators, emergency power, etc can handle. If it is scoped to handle 1,000 pe

>Put another way, what matters is the maximum volume the electrical, sewer, HVAC, elevators, emergency power, etc can handle. If it is scoped to handle 1,000 people for 8 hours of a day, it will do just fine for 300 people 24 hours per day. Almost. Use case for commercial office and residential is significantly different. In an office building, the largest electrical load will be HVAC. In a residential environment, it will be more evenly split between water heating, HVAC and appliances. For example, in an office building, you might have one or two smallish water heaters to provide hot water for sinks, with a recirc pump to keep the water heater requirements down even further. There may not even be a dishwasher at all. In residential, you get dishwashers, washing machines, showers and sinks that all need hot water. And they will run often, usually at fixed time points meaning you cannot diversify the electrical in the same way you would for an office building. My point about a 50 story converted office building is the office building's elevators are sized differently for a different use case. There is a great deal of witchcraft and sorcery in how elevator companies do this calculation, but a 50 story residential has different elevator requirements than a 50 story office. It may not be much, but it is different. And you can't just add an elevator if you need to. They are integral to the structure of the building. All this to say, yes, it can be done, but it won't be. It's fantastically expensive and there just aren't enough rich people to justify doing more than one or two. This also does not apply to a more modest 3, 4 or 5 story office building. The requirements are much more manageable for these. I am only referencing the big buildings, maybe 10 stories or higher.