
Quoting
Mealey v Arndt, 206 Ariz. 218; 76 P.3d 892 (2003)
Although Arizona has acknowledged the doctrine of boundary by acquiescence, it has not clearly defined the elements. Hein v. Nutt, 66 Ariz. 107, 114, 184 P.2d 656, 661 (1947). We therefore look to other jurisdictions. Generally, to establish the doctrine of boundary by acquiescence, the party asserting the doctrine must prove (1) occupation or possession of property up to a clearly defined line, (2) mutual acquiescence by the adjoining landowners in that line as the dividing line between their properties, and (3) continued acquiescence for a long period of time. Davis v. Mitchell, 628 A.2d 657, 660 (Me. 1993); Platt v. Martinez, 90 N.M. 323, 563 P.2d 586, 587 (N.M. 1977); Knox v. Bogan, 322 S.C. 64, 472 S.E.2d 43, 49 (S.C. Ct. App. 1996); Staker v. Ainsworth, 785 P.2d 417, 420 (Utah 1990); Kurtis A. Kemper, Cause of Action to Establish Boundary by Acquiescence of Adjoining Landowners, 3 COA 2d 729, 743 § 5 (1993). In Arizona, the required period of time for acquiescence is ten years, the same as that for adverse possession. A.R.S. § 12-526(A) (2003); Hein, 66 Ariz. at 114, 184 P.2d at 661.
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