Okla. Stat. tit. 12A, § 12A-2A-507: Proof of Market Rent; Time and Place

PROOF OF MARKET RENT; TIME AND PLACE

(1) Damages based on market rent (Section 2A-519 or 2A-528 of

this title) are determined according to the rent for the use of the

goods concerned for a lease term identical to the remaining lease

term of the original lease agreement and prevailing at the times

specified in Sections 2A-519 and 2A-528 of this title.

(2) If evidence of rent for the use of the goods concerned for

a lease term identical to the remaining lease term of the original

lease agreement and prevailing at the times or places described in

this article is not readily available, the rent prevailing within

any reasonable time before or after the time described or at any

other place or for a different lease term which in commercial

judgment or under usage of trade would serve as a reasonable

substitute for the one described may be used, making any proper

allowance for the difference, including the cost of transporting the

goods to or from the other place.

(3) Evidence of a relevant rent prevailing at a time or place

or for a lease term other than the one described in this article

offered by one party is not admissible unless and until he has given

the other party notice the court finds sufficient to prevent unfair

surprise.

(4) If the prevailing rent or value of any goods regularly

leased in any established market is in issue, reports in official

publications or trade journals or in newspapers or periodicals of

general circulation published as the reports of that market are

admissible in evidence. The circumstances of the preparation of the

report may be shown to affect its weight but not its admissibility.