Does that tree house have a permit?

For those of you in Zoning Enforcement, you might be interested in this story. To summarize, the owner is an active member of the armed services and he had this built on his property:

He ran afoul of the law when he constructed a tree house without a permit. Now the local zoning board has issued an order to have it removed. OUCH! I'm not in zoning enforcement, but I can't help but to feel sympathetic to both sides of this, the military dad and the zoning official. Fortunately, our city does not regulate tree houses!