As a related topic;
The Fl IAEI is questioning sinage etc when the garage of a model home is being used as office space. The question is whether this should then require everything that is required in any other office. If you really did a life safety checklist it would probably just eliminate that usage. I can't imagine how you could really call the garage door an egress route if the power was out. I actually came down on the "too restrictive" side of the argument. I am not totally sure how they get away with not having full egress signage and accessibility in ANY building permanently used as a model and that would certainly apply to one used as office space.
They say a model is the same as any other home for sale by owner. I dissagree. This was purpose built to sell other homes, not THAT one. It isn't a home for sale, it is a display open to the public.