AZ Const., Article XIV, Section 8

No domestic or foreign corporation shall do any business in this state without having filed its articles of incorporation or a certified copy thereof with the corporation commission, and without having one or more known places of business and an authorized agent, or agents, in the state upon whom process may be served. Suit may be maintained against a foreign corporation in the county where an agent of such corporation may be found, or in the county where the cause of action may arise. Eminent domain; taking corporate property and franchises for public use