Depends on the application, supposedly around 7 high, which gives you kind of a mid-rise, unless there was some other supporting structure used to hold them in place. But beyond that height you have other issues like elevators and life safety systems, which eats into the cost savings you'd get using the modular containers, so it's probably better for a modular mid-rise type solution rather than something really tall.
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"Old ideas can sometimes use new buildings. New ideas must use old buildings."--Jane Jacobs
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