delivered the Opinion of the Court.
The court of appeals in
Pomeranz v. McDonald’s Corp.,
I
In 1963, the respondent, McDonald’s Corporation, entered into a commercial lease agreement with Tellar Arms, Inc., the petitioners’ predecessor-in-interest, for the lease of space in a shopping center in Grand Junction, Colorado. 1 In May 1974, the petitioners and McDonald’s mutually agreed to amend the lease to require McDonald’s to pay taxes and maintenance costs in addition to rent. McDonald’s remained in possession of the premises until February 1986, when it moved to another location. McDonald’s breached the lease agreement in September 1986, when it was unable to sublease the property and ceased making payments to the petitioners under the lease, although it paid the taxes and maintenance costs until that time. The amount paid by McDonald’s for taxes and maintenance is not in evidence.
The petitioners brought suit against McDonald’s alleging that McDonald’s default on its obligation to pay rent constituted a breach of the lease agreement. Thе remedy sought by the petitioners was a judgment for “all rent and other charges accruing under the lease.” In addition to future rent and insurance, the petitioners sought payment of future taxes and maintenance expenses as “other charges accruing under the lease.”
At the trial before the court, the petitioners presented the testimony of Theodore Pomeranz, the managing co-owner of the shopping center, as the sole evidence that “other charges” had accrued and would continue to accrue through the end of the lease term. Pomeranz testified that, in his opinion, future taxes on the property would amount to $48,363 through the end of the lease term. He arrived at this figure by taking the amount of the 1987 tax bill and calculating an annual tax increase of five percent based on inflation. 2 Pomeranz also testified that, in his opinion, future maintenance expenses for the property would amount to $35,407, based on his estimate of *1381 $4,800 per year and an annual increase of five percent for inflation. 3 Pomeranz provided no supporting information on how he arrived at the $4,800 amount. 4 Moreover, Pomeranz was not qualified as an expert in either the estimation of inflation rates, property taxes, or maintenance expenses.
At the conclusion of the trial, the trial court held that McDonald’s had breached the lease and was liable to the petitioners for damages, including future rent, insurance, taxes, and maintenance expenses. The trial court based its award of damages for future taxes and maintenance expenses solely on Pomeranz’s testimony.
The court of appeals affirmed the trial court’s determination that McDonald’s had breached the lease and owed the petitioners damages. However, the court of appeals reversed that portion of the judgment awarding future taxes and maintenance expenses, concluding “that Pomeranz’s testimony, much of which constituted hearsay and speculation [was] insufficient to support an award of damages for future ... maintenance, and, taxes.”
Pomeranz,
II
In a breach of contract action, a plaintiff may recover the amount of damages that are required to place him in the same position he would have occupied had the breach not occurred.
Schneiker v. Gordon,
The “rule of certainty” most often arises in breach of contract cases involving lost profits, but the rule also applies to other claims for future losses. See Charles T. McCormick, Handbook on the Law of Damages § 28 (1935) [hereinafter McCor *1382 mick]. We have never addressed the rule of certainty in cases involving future taxes or future maintenance expenses.
McDonald’s claims that this case is governed by our decisions in lost profit cases. McDonald's asserts that thе petitioners failed to prove the amount of future damages with adequate certainty because the petitioners did not present expert testimony regarding mill levies or property valuations, or the best evidence of either past, present, or future maintenance costs.
See Tull v. Gundersons, Inc.,
Ill
In a breach of contract action involving future damages, a plaintiff is required to prove both the fact of the injury and the amount of the loss.
See, e.g., Tull,
In balancing the competing interests involved in a future damages case, we have adopted a rule rеquiring a plaintiff to provide the trier of fact with (1) proof of the fact that damages will accrue in the future, and (2) sufficient admissible evidence which would enable the trier of fact to compute a fair approximation of the loss.
See id.
at 310,
In
Tull,
we addressed a situation in which the plaintiff provided detailed estimations of lost profits by submitting itemized costs of completion and expected profits. In finding that the plaintiff had sustained his burden of proof on the issue of lost profits, we held that such testimony was the best evidence obtainable under the circumstances.
Tull,
IV
The petitioners contend that the rejection by the court of appeals of the evidence they presented usurped the trial court’s discretion to act as fact-finder and determine the credibility, reliability, qualifications, and knowledge of witnesses. A reviewing court will not set aside factual findings of a trial court where the findings are supported by competent and adequate evidence appearing in the record.
Anderson v. Cold Spring. Tungsten,
Under the Colorado Rules of Evidence, a witness may not testify unless evidence is introduced to support a finding that the witness has personal knowledge of the matter on which he testifies. C.R.E. 602. A witness who is not qualified as an expert may only testify as to an opinion where it is shown that the opinion is rationally based on the perception of the witness. C.R.E. 701. The petitioners did not qualify Pomeranz as an expert in determining mill levies, property assessments, inflation rates, or maintenance expenses. Pomer-anz’s sole qualification for testifying as to future taxes and maintenance expenses was that he was co-owner and manager of the property leased to McDonald’s. The petitioners made no attempt to establish Pomeranz’s basis of knowledge for testifying about the amount of future maintenance expenses, and no evidence was before the court on what the actual maintenance costs were.
A
Despite McDonald’s repeated objections, the petitioners laid no foundation for Pom-eranz’s opinion testimony that maintenance expenses amounted to $4,800 per year and would escalate at an inflationаry rate of five percent. Pomeranz may have been qualified to testify about the cost of maintenance if it had been established that he possessed some personal knowledge of the maintenance costs, that maintenance costs were part of the business records relating to the property, or that his opinion was rationally based on his own perceptions as thе managing co-owner of the property. See C.R.E. 602; C.R.E. 701. However, *1384 there is no evidence in the record which establishes that Pomeranz ever paid a bill relating to the maintenance of the property or that he was personally responsible for any aspect of the maintenance because McDonald’s had been responsible for the payments for the past fifteen years. 8
Because no adequate evidentiary foundation was laid for Pomeranz’s estimation of maintenance expenses on the property, it is impossible, absent pure speculation, to ascertain from the record how Pomeranz obtained the $4,800 estimation. The trial court's factual findings relating to future maintenance expenses are not sustained by either competent or adequate evidenсe and are therefore clearly erroneous.
See Anderson,
The evidence presented by the petitioners on the issue of future maintenance expenses was legally insufficient to provide a basis from which the trial court could arrive at а fair approximation of the amount of those expenses. However, on remand, the trial court may award nominal damages for future maintenance expenses.
See Doyle v. McBee,
B
In attempting to prove the amount of future taxes, Pomeranz testified that as the managing co-owner of the property, he had personally paid the tax assessments as they came due and then billed McDonald’s for those amounts. It is undisputed that in the twenty four years the petitioners had owned the property, taxes had been assessed and paid every year. A reasonable inference from this fact is that taxes would continue to be assessed on the property in the future. Based on Pomeranz’s testimony, the petitioners established the fact that they were damaged as to future taxes.
The petitioners were also required to submit sufficient evidence from which the trier of fact could reasonably determine the amount of future taxes. The recоrd reflects that the petitioners established the most recent amounts of assessed taxes by properly admitting the tax bill for the second half of 1986 and the full amount of 1987. These tax bills showed that the amount of 1987 taxes was higher than the amount of 1986 taxes. McDonald’s presented no rebuttal evidence that future taxes would be lower than the amount of 1987 taxes. A reasonable inference can be drawn from this evidence that future taxes on the property would at least equal the 1986 and 1987 tax amounts.
While the trial court erred in determining the amount of future taxes by accepting Pomeranz’s five percent inflation factor, we can not say, based on the admissible evidence in this case, that an award of future taxes would be clearly erroneous. There is enough competent evidence in the record from which a trier of fact could compute McDonald’s liability for future taxes with reasonable certainty. Therefore, as we said in Peterson,
[i]n our view, the interests of all concerned, will be best served at this time by a reversal of the [court of appeals] judgment, and the remanding of this case for a new trial on the sole issue of the [amount of future taxes owed to the peti *1385 tioners] as a rеsult of [McDonald’s] breach of the contract. The alternative would be to remand the case for review of the evidence and a reanalysis thereof by the trial court for the purpose of additional findings and modification of judgment. Because of the lapse of time since the trial, we believe this would be an undue burden on the trial court, and would not accomplish fully the attainment of аn award of adequate damages.
Peterson,
V
Accordingly, we return this case to the court of appeals with directions to remand to the trial court for a new trial consistent with the views expressed in this opinion.
Notes
. The petitioners are a group of individuals and estates doing business as Mesa Denver Associates, who purchased individual undivided interеsts in the property from Tellar Arms, Inc., and presently own the shopping center.
. The amount of the 1987 tax bill was $6,563.31. The tax bill was admitted into evidence without objection. Additionally, the tax bill for the second half of 1986 was admitted into evidence without objection. However, Pomeranz’s testimony on the amount of future taxes and the five *1381 percent inflation rate was admitted over McDonald’s objection.
. Pomeranz's testimony was admitted over McDonald’s objection.
. The record reflects that Pomeranz had no personal knowledge of the amounts paid as maintenance on the property because McDonald’s had paid these amounts for the previous fifteen years pursuant to the lease agreement.
. In addition to reversing that part of the judgment for future taxes and maintenancе expenses, the court of appeals reversed a judgment for future insurance costs. The court of appeals held that Pomeranz’s testimony relating to the anticipated cost of insurance was inadmissible hearsay, based solely on a single unaccepted offer of insurance, and was entirely too speculative to establish with reasonable certainty the actual cost of insurance.
Pomeranz,
. Following the 1974 amendment, McDonald’s was obligated to pay, in addition to monthly rent, property taxes and maintenance expenses. It is undisputed that McDonald’s would be required to make these expense payments had it not breached the lease agreement and that McDonald’s made these payments prior to its abandonment and breach of the lease.
. Were such a requirement always necessary, courts would be required to draw arbitrary lines on what is the best evidence under the circumstances, or whether expert testimony is always necessary. Expert testimony is not always required to establish the amount of future damages. However, under the "best obtainable evidence rule" propounded by McDonald’s, expert testimony would almost always be necessary because experts possess a level of knowledge not ordinarily held by owners of property and businesses.
. In prоviding his estimate of future maintenance expenses, Pomeranz testified that the $4,800 included lot sweeping, lot striping, lot repairs, snow removal, structural repairs, painting, and roofing. However, Pomeranz did not testify how often each of these items would occur, what each would cost, or that he had ever paid any amount for these items in the past. In fact, Pomeranz did not testify that he was basing his estimation of future expenses on past maintenance expenses, bids for future maintenance expenses, or costs incurred by similar properties.
