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Minimum room size except for bathrooms and kitchens is 70 sq ft with no dimension smaller than 7'. Practically speaking the smallest full bathroom with a bath tub is 35 sq ft (5' x 7').
Yes one room needs to be 120 sq ft.
The rule is 1 room minimum of 120' the remaining rooms no smaller than 70'.
IRC 304.1 & 304.2
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