I agree that the OP did not fully describe what he meant by 'concession stand.'
What about .... a simple bank of vending machines, perhaps with a microwave on the counter, with or without a sink?
Without a sink, it's not a 'kitchen' of any sort.
Without the microwave being built-in, it's just a 'break room,' and not a kitchen ... even if there's a sink. Nuking a sandwitch does not constitute 'preparing food.'
Even assuming there was a 'kitchen,' that might apply only to the specific area about the sink and the cooking equipment, and not the entire room. (I have in mind a certain University 'student union' which has light-duty cooking facilities along part of a wall in the common TV / seating / recreation area).
Looking at another common variation, what about the 'concession stand' at the local ball field. Nothing there but a soda fountain (maybe) and a freezer for prepackaged ice cream. No cooking at all.