Late but I get it it would include industrial or anything. Tribal enterprises are wholly owned enterprises ( usually ) so they could by say a small mall chain and the entire mall complexes would be tax exempt. Hell just for the sake of to the extreme they could buy the Columbia Tower and would not have to pay property taxes on it.

The devil is in the details but the advantage in business ventures would be massive. Oh yeah Senator Swecker ( DS is R the other sponsor is D ) is Thurston County which happens to be where the Chehalis tribe is ( and Great Wolf I think ) I think. Surprise!