What are the elements of an estoppel claim?

"'The essence of an estoppel is that one has, by false statements or conduct, led another to do that which he would not otherwise have done and as a result the other has suffered injury. [Citation.] The elements of an estoppel claim are: "(1) the party to be estopped must be apprised of the facts; (2) he must intend that his conduct shall be acted upon, or must so act that the party asserting the estoppel had a right to believe it was so intended; (3) the other party must be ignorant of the true state of facts; and (4) he must rely upon the conduct to his injury." [Citation.] Where the defendant is a government entity, a fifth element requires that the injury to the plaintiff's personal interest if the government is not estopped outweighs the injury to the public interest if the government is estopped. [Citation.]' [Citation.] Moreover, simple reliance on a false statement or conduct is not enough. In order to invoke the doctrine of equitable estoppel, the reliance must be reasonable. [Citation.]" (Brown v. Chiang (2011) 198 Cal.App.4th 1203, 1227.)