Under the Arizona Residential Landlord and Tenant Act, a tenant who is not operating under a lease is legally defined as a periodic tenant. In those situations, both landlord and tenant are entitled to certain notice if they wish to change the terms of the rental agreement. A.R.S. § 33-1375 provides that the tenancy of a week-to-week tenant can be terminated by either party with a ten day notice. The tenancy of a month-to-month tenant may be terminated by either party with a 30 day notice. It is important to understand that the time period for termination ends the tenancy at the end of the period, not simply ten or thirty days from the date of the notice. So if you’re a month-to-month tenant who pays on the first of each month, and the landlord sends you a thirty day notice of termination on the 15th of the month, your tenancy does not end on the 15th of the following month; it ends on the last day. This is because in such a situation the rental period is from the first to the 31st of the month. The tenancy cannot be terminated until the end of the rental period.
If you are in a lease situation, you have the right to remain in the apartment until the expiration of your lease. But be aware that many leases contain provisions that require the tenant to give a thirty (and in some cases, sixty) day notice of intent not to terminate. Make sure you know the terms of your lease; you may be liable for an extra month’s rent if the lease contains such a clause. It is important to know, however, that under A.R.S. §33-1305(A) the landlord has the duty to mitigate damages. That means that he must make a good faith attempt to re-rent the apartment so as to minimize your damages.
A.R.S. § 33-1329 specifically provides that the state legislature may not impose any sort of rent regulation or rent control on landlords. This means that at the end of your tenancy, the landlord may raise your rent however high he wants to (and can get away with).