Thanks folks. I'll try to clarify. I am looking at turning this frame into house. My question around the "code" is exactly what brad_bb mentioned in his post:

"the problem here is the large clear span - 30' and then trying to add a second floor on it. This is an engineering problem. As you go beyond 24 feet, the stresses increase dramatically. I actually have the same problem in that I want a 30 foot clear span and second floor living space above."

I appreciate everyone's input. I'll try to get some additional details in the near future.