Arizona Court of Appeals Division One Holds That (1) A Contractor Hired By A Tenant To Make Improvements To Leased Property Can Recover From The Property Owner Under A Theory of Unjust Enrichment Only When The Owner Engaged In Improper Conduct, (2) A Lease Agreement Cannot Disclaim An Agency Relationship For Purposes Of The Lien Statutes, A.R.S. §§ 33-981 to -1008, and (3) A Mechanic’s Lien On A Leasehold Interest May Survive The Lease Termination If Tenant Serves As Owner’s Agent For