Heads up - 2013 CBC and 2012 IBC Section 1028.12 Exception #2 is incomplete, and therefore, in error. The exception makes sense grammatically, but is obviously out of context as worded when found between exceptions 1 and 3. It negates exception 3 and makes 1 unnecessary.
ICC shows errata for IBC that includes the words, "with seating at tables and" between the words "thereof" and "without". The sentence now says, " ... portions thereof with seating at tables and without ramped or tiered floors ..." Exceptions 1 & 3 now have meaning again.
ICC does not show errata for CBC yet. At least, not that I found on their website.
Without those words, a code user could choose exception 2 for ANY occupant load and, in theory, not be required to fasten seats to the floor.
With those words in place it's a totally different application.