
Quoting
Camelback Del Este Homeowners v. Warner, 156 Ariz. 21, 749 P. 2d 930 (1988)
Estoppel has three recognized elements: 1) acts inconsistent with the claim afterwards relied on; 2) action by the adverse party on the faith of such conduct; 3) injury to the adverse party resulting from the repudiation of such conduct. Holmes v. Graves, 83 Ariz. 174, 177, 318 P.2d 354, 356 (1957). Our courts have stated, "[a] correlative essential element of estoppel is that one seeking its protection must have lacked knowledge, and the means of acquiring knowledge, of the facts relied upon. A party's silence will not operate as an estoppel against it where the means of acquiring knowledge were equally available to both parties." Honeywell Inc. v. Arnold Construction Co., Inc., 134 Ariz. 153, 158, 654 P.2d 301, 306 (App. 1982).