In Arntz Builders v. City of Berkeley, the city entered into a contract with a contractor on a $20 million library project. The contract provided that, if the contractor disagreed with the city’s decision on a dispute, the contractor’s sole and exclusive remedy was to file a claim in accordance with a detailed claims procedure. The contract stated that failure to file a claim as required would result in a waiver of the claim. After failing to adhere to the contract’s claims requirements, the contractor filed a complaint against the city. In its answer to the complaint, the city asserted an affirmative defense that the complaint was barred by the contractor’s failure to comply with the Government Code claims requirements as set forth in section §§ 900, et seq. of the Government Code. The trial court held the contractor was required to comply with both the contract’s claims requirements and with the Government Code claim requirements. The appellate court reversed the trial court’s decision, stating public agencies are allowed to establish different claims procedures by contract and, sometimes, such provisions amount to a claims procedure that takes the place of a claims statute. Government Code § 950.4 provides that a claims procedure established by agreement “. . . exclusively governs the claims to which it relates.” Arntz Builders v. City of Berkeley, 166 Cal.App.4th 276, 82 Cal.Rptr.3d 605 (2008).