There are logistics and economics to how the anticipated tenant will use it and and how deep a ‘bay’ is. Residential like hotels and apartments have regulations on light and air. On larger lots this sometimes leads to U or L shapes with a corridor in the middle so the units are on an exterior wall.
An office has a different functional bay depth than something like a building used for labs or research.
And, often, available land and the cost of it. Buildings start going taller when land gets expensive.
Sorry, that’s not an ELI5 answer.
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