J. J. Lopez leased real property in the city of Bakersfield to S. S. Lombard for the operation of an automobile supply and service station or other business, for a period of ten years commencing July 1, 1929. The lessee was authorized to construct buildings and other improvements on the land and to remove them at the end of the term. The trial court found that the lessee spent $13,500 for structures on the land, relying on a provision in the lease giving him an option to purchase the land upon the expiration of the lease “at a price and terms then to be agreed on between the parties hereto, and if not agreed on then to be fixed by arbitration, each of the parties hereto selecting one arbitrator, and the two selected [sic] a third, which said arbitrators shall fix such purchase price and the terms under which the purchase may be made, but with the proviso that on the matter of terms át least one-half of such purchase price shall be payable in cash, and the remaining half to be evidenced by promissory note secured by deed of trust, and to draw not less than the legal rate of interest. ’ ’ Any assignment of the lease and the option to purchase was subject to the lessor’s written consent. Lombard assigned to plaintiff his interest in “the indenture of lease, ” with the lessor’s written consent. When plaintiff exercised the option to purchase the land at the end of the term the lessor refused to sell. Upon the lessor’s refusal to comply with his obligation under the option agreement plaintiff appointed an arbitrator to fix the price and terms of purchase. This arbitrator with two.others fixed the purchase price and the terms for the payment of that part thereof that was not payable in cash. On defendant’s motion, however, the court vacated their decision on the ground that the arbitrator allegedly appointed by the lessor was not duly appointed by him.
(In re Bewick,
Defendant contends that the trial court lacked jurisdiction to decree specific performance of a contract of a decedent during administration of his estate on the ground that the probate court had exclusive jurisdiction of the matter. A demand for specific performance of a contract of a decedent by conveyance or transfer of property in the possession of the administrator or executor differs from a claim of a general creditor seeking satisfaction out of the assets of the estate. (Prob. Code, § 700 et seq.;
Estate of Dutard,
Defendant contends that the assignment of the lease by Lombard to plaintiff did not carry with it the option to purchase the land. The assignment named as its subject matter “the indenture of lease.” “The assignment of the writings by which a contract is witnessed is the most common mode of transferring the contract, and cannot be understood as having any other intention.”
(Blakeman
v.
Miller,
Defendant contends that plaintiff failed to make use of the statutory remedy' under section 1283 of the Code of Civil Procedure to have an arbitrator appointed by the court when defendant refused to appoint an arbitrator and that the court could not fix a price when plaintiff had an adequate remedy to obtain the fixing of a price hy arbitrators. Section 1283 of the Code of Civil Procedure allowing the court to appoint an arbitrator if one party has failed to make an appointment upon demand of the other is applicable, however, only if the parties have agreed to submit a controversy to arbitration within the meaning of section 1280 of the Code of Civil Procedure. Section 1280 requires that there be a controversy arising out of the contract or the refusal of one of them to perform the contract. It was not contemplated by the option agreement in the present case that the arbitrators should decide any controversy arising out of the option agreement or the refusal of the parties to perform. Their sole task was to determine the value of the land and to fix the purchase price accordingly and the installments for the payment of the credited part of the price. “A reference to a third person to fix by his judgment the price, quantity, or quality of material, to make an appraisement of property and the like, especially when such reference is one of the stipulations of a contract founded on other and good considerations, differs in many respects from an ordinary submission to arbitration.”
(Palmer
v.
Clark,
Defendant contends that the option agreement was too indefinite to give rise to a contract upon the exercise of the option, but that if there was a contract it established the exclusive method of ascertaining the price and terms of purchase. Since the plaintiff was willing to pay the entire price in cash the only question of uncertainty remaining concerned price. (See Restatement: Contracts, § 370, Illustration 1.) If the consideration is executory its determination may be left to a disinterested third person. (Civ. Code, § 1610.) The option covenant providing for the appointment of third persons to ascertain the price was therefore definite enough to give rise to a contract. The only question to be determined is whether defendant’s failure to appoint an appraiser made the contract invalid or incapable of specific performance for want of certainty. (See
Hardy
v.
Hardy,
In the present ease the contractual method of ascertaining the purchase price became impossible of execution, not as the result of circumstances beyond the control of the parties, but because of defendant’s refusal to appoint an appraiser, thus making impossible an appraisal as contemplated by the agreement. 'Defendant’s refusal to participate in establishing the appraisement board was a violation of her contractual obligation to take the necessary steps to make the appraisement provision of the contract operative. Bach party to a contract has a duty to do everything that the contract presupposes that he will do to accomplish its purpose
(Epstein
v.
Gradowitz,
Moreover, section 1613 of the Civil Code prescribes that “Where a contract provides an exclusive method by which its consideration is to be ascertained, which method appears possible on its face, but in fact is, or becomes, impossible of execution, such provision only is void; ...” Under this section impossibility of ascertaining the price by the contractual method does not preclude a court from giving effect to the contract, ascertaining the consideration in place of the arbitrators or appraisers. Determination of the value of the property is a common task of courts in condemnation, partition, and other proceedings. If equitable considerations support the position of one who seeks specific performance, par
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tieularly if he has previously changed his position in reliance on the contractual right that he seeks to enforce, courts of equity will assume the task of ascertaining the consideration if it has become impossible of ascertainment by the method provided in the contract. Thus it was said in
Kaufmann
v.
Liggett,
The judgment is affirmed.
Gibson, C. J., Shenk, J., Edmonds, J., Carter, J., and Schauer, J., concurred.
Appellant’s petition for a rehearing was denied March 22, 1945. Carter, J., voted for a rehearing.
