Ariz. Rev. Stat. § 28-7102
A. If the board adopts a highway corridor and selects a highway alignment for the adopted corridor, within eighteen months of selection of the alignment, the board shall adopt a resolution of necessity declaring that acquisition of one or more parcels of real property is necessary for transportation purposes. If the department has not presented a written offer to the property owner within six months of the adoption of the resolution of necessity, the property owner may file an action in superior court for inverse condemnation to do either of the following:
G. The time limitations prescribed in this section may be extended by the board if both of the following occur: