2. Rex A. Christensen, PLLC The Christensen Law Firm Arizona Construction Law The Christensen Law Firm was founded with the goal of providing exceptional service to businesses in the construction industry. The firm's practice includes contract, corporate, and other commercial litigation, with special emphasis on the resolution of construction disputes through mediation, arbitration, administrative proceedings or litigation in both state and federal courts. The firm's clients include developers, general contractors, subcontractors, materials suppliers, design professionals, and sureties.