
478 S.E.2d 228 (1996)
C. Dupree SMITH and wife, Mae L. Smith, Plaintiffs,
v.
J. Matthew MARTIN, Defendant and Third Party Plaintiff,
v.
Robert HASSELL, Third-Party Defendant.
No. COA95-551.
Court of Appeals of North Carolina.
December 3, 1996.
*230 Brown & Bunch by Charles Gordon Brown and Scott D. Zimmerman, Chapel Hill, for plaintiff-appellees.
Bryant, Patterson, Covington & Idol, P.A. by Lee A. Patterson, II, Durham, for defendant-appellant.
McGEE, Judge.
Defendant argues summary judgment for the Smiths was inappropriate because: 1) there were genuine issues of material fact as to what duty the defendant owed the Smiths; 2) the Smiths suffered no damages from any actions by the defendant because of an agreement to subordinate their loan to the UCB loan; and 3) there were genuine issues of material fact regarding the reasonableness of the damages awarded. Upon review of *231 the record and briefs, we do not agree with defendant's contentions and affirm the order and judgment of the trial court.

I.
Defendant first contends the trial court erred in granting summary judgment for the Smiths because there were genuine issues of material fact concerning the defendant's duty to the Smiths under each of their four causes of action. We disagree. Because we hold that defendant breached his duty as trustee under the deed of trust as a matter of law, defendant is liable to the Smiths for damages caused by his breach. See Shore v. Brown, 324 N.C. 427, 428, 378 S.E.2d 778, 779 (1989)(summary judgment upheld on appeal if it can be sustained on any grounds).
In this case, defendant cancelled the deed of trust without contacting the Smiths or otherwise verifying that the underlying debt had been paid. "The trustee, at his peril, is bound to know that the indebtedness is paid before he executes a release of the security, and, where he unwarrantably releases the lien of his trust deed, is liable to his principal for the damages which necessarily flow from his wrongful act." Annotation, Duty and Liability of Trustee Under Mortgage or Deed of Trust to Holders of Bonds, or Other Obligations Secured Thereby, 57 A.L.R. 477 (1928).
[I]n the absence of authorization by the bondholders, a trustee in a deed of trust in the nature of a mortgage has authority to release the mortgaged property without receipt of payment of the debt secured, only when it is conferred on him by the deed of trust.... In any event, the trustee is liable to the creditors for the damages which proximately result from his wrongful act, and the fact that the trustee believed that he acted for the best interests of all concerned does not constitute justification therefor.
55 Am.Jur.2d Mortgages § 467 (1971).
Our case law also supports the position that a trustee on a deed of trust is liable as a matter of law when he cancels the deed of trust without authorization of the principal and/or without determining that the underlying obligation has been satisfied. In Davenport v. Vaughn, 193 N.C. 646, 137 S.E. 714 (1927), the defendant Vaughn served as trustee on a deed of trust securing eight promissory notes. The plaintiff in that case was the holder in due course of one of the eight notes. Upon a default on the notes, Mr. Simmons, the holder of the other seven notes, advertised and sold the land secured by the deed of trust in the name of the trustee, Vaughn. Simmons then prepared a deed in Vaughn's name and presented the deed to him for execution. Vaughn refused to sign when Simmons presented only seven of the eight notes, claiming he had "misplaced or lost" the other note. Simmons later returned with a forged note, saying he found the missing note in his files. Vaughn then executed the deed.
In affirming the trial court's judgment for the plaintiff, our Supreme Court held the trustee "was bound to inquire for the debts made payable" out of the proceeds of the sale of the property, Davenport, 193 N.C. at 649, 137 S.E. at 716, and where "through haste, imprudence, or want of diligence his conduct was such as to advance the interest of one person to the injury of another, he became personally liable to the injured party." Id. at 650, 137 S.E. at 716. The court further held that where the trustee relied upon Simmons' "bare representation" that he held all eight notes although the trustee had "occasion to doubt and reason to scrutinize" the transaction, "the facts exhibit a degree of negligence and want of prudence which fully justify the referee and the judge in their conclusions of law." Id. Therefore, a trustee is "bound to inquire" whether an underlying debt has been satisfied before cancelling a deed of trust and may not rely upon the "bare representations" of others. Further, our case law holds that a trustee is restricted to the powers given by the deed of trust unless given express permission to act by the principal or unless the power to act may be inferred from special facts and circumstances. Wynn v. Grant, 166 N.C. 39, 46, 81 S.E. 949, 953 (1914); Gregg v. Williamson, 246 N.C. 356, 360, 98 S.E.2d 481, 485 (1957).
*232 In this case, the deed of trust authorized the trustee to cancel the deed of trust "[i]f the grantor shall pay the note secured hereby." Although defendant did not cancel the $35,000 deed of trust until receiving an affidavit from the Smiths stating the underlying debt had been paid, it is undisputed that he cancelled the $55,000 deed of trust without the Smiths' permission and without the underlying note being paid. Therefore, defendant had no power to cancel the $55,000 deed of trust and is liable as a matter of law to the Smiths for their damages flowing from its unauthorized cancellation. This assignment of error is overruled.

II.
Defendant also contends the trial court erred in granting summary judgment for the Smiths because the cancellation of the deed of trust was not a proximate cause of the Smiths' damages. Defendant argues that since the Smiths signed an agreement on 19 April 1990 purporting to subordinate their loan to the UCB loan, they suffered no damages by his actions. Again, we disagree.
We first note the record creates much doubt as to whether the "Deed of Subordination" signed by the Smiths on 19 April 1990 was ever intended to subordinate their deed of trust to UCB's $245,433 deed of trust. The Smiths signed the deed of subordination contemporaneously with the Lattas' receipt of a $58,064 loan from UCB partially secured by a deed of trust on the property. The Lattas later obtained two more unsecured loans from UCB before obtaining the $245,433 consolidation loan. Robert Hassell, who prepared the deed of subordination, testified at his deposition that the deed of subordination "had nothing to do" with the $245,433 loan. Further, the parties never recorded the instrument and there would have been no need to cancel the Smiths' deed of trust if the parties believed the deed of subordination gave UCB a first priority lien on the property for the $245,433 loan. However, regardless of the intentions of the parties, we hold the deed of subordination is unenforceable as a matter of law.
The typical subordination agreement involves property sold subject to a purchase money mortgage. The buyer is authorized to subject the land to a subsequent mortgage, which is given priority over the purchase money mortgage, in order to obtain funds for construction or development of the property. MCB Limited v. McGowan, 86 N.C.App. 607, 609, 359 S.E.2d 50, 52 (1987). The issue of the necessary specificity of terms required in a subordination agreement has been addressed by our courts in the case of MCB Limited v. McGowan, supra. In McGowan, this Court reviewed the development of cases dealing with enforcement of subordination agreements in California, the only jurisdiction that has dealt extensively with the issue. Although not a basis for the ultimate decision, McGowan favorably cites the California Court of Appeals' decision in Stockwell v. Lindeman, 229 Cal.App.2d 750, 40 Cal.Rptr. 555 (1964), for the proposition that, where all of the details of future loans are not known to the parties, "a subordination clause must state the matters which most directly affect the security of the seller's purchase money mortgagethe maximum amount of the proposed loan and the maximum rate of interest permitted on the future obligation." McGowan, 86 N.C.App. at 610, 359 S.E.2d at 52. Because of the unique risks involved in subordination agreements, these terms are necessary to "`define and minimize the risk that the subordinating liens will impair or destroy the seller's security.'" Id., quoting Handy v. Gordon, 65 Cal.2d 578, 55 Cal.Rptr. 769, 770-71, 422 P.2d 329 (1967). We agree with this reasoning. Therefore, we hold that subordination agreements and clauses which subordinate loan obligations secured by a deed of trust to future loans must, at a minimum, include terms which state the maximum amount of the future loan and the maximum rate of interest permitted on the loan. This requirement serves to protect the security interest of the holder of the prior deed of trust.
In this case, had the subordination agreement contained the required terms, it would have eliminated much of the confusion between the parties as to which UCB loan the Smiths had agreed to subordinate their interest. The Smiths argue, and Robert Hassell's deposition supports their position, that they *233 believed the agreement only subordinated their deed of trust to the $58,064 UCB loan. It seems unlikely the Smiths would have agreed to subordinate their lien to a secured loan large enough to destroy their security interest. Because the deed of subordination failed to state the maximum amount and interest rate of the future loan from UCB, it failed to adequately protect the Smiths by defining and minimizing the risk to their security interest. Therefore, the deed of subordination was unenforceable as a matter of law. Since the subordination agreement was unenforceable, the Smiths would have had a first priority lien over UCB's interest if defendant had not wrongfully cancelled the Smiths' deed of trust. The cancellation of the deed of trust was a proximate cause of the Smiths' damages and this assignment of error is overruled.

III.
Lastly, defendant argues the trial court erred in granting summary judgment for the Smiths because there were genuine issues of material fact regarding the reasonableness of the mitigation expenses incurred by the Smiths. Defendant has not assigned as error nor argued in his brief that the trial court erred in awarding the amount of the principal ($50,834.67) and interest ($20,250.31) due under the note or attorney's fees pursuant to N.C. Gen.Stat. § 6-21.2 ($10,662.74). Therefore, the amount in dispute is the $30,135.74 the Smiths incurred in attorneys fees and expenses pursuing their action in bankruptcy court in an attempt to mitigate damages. Neither party has raised the issue of whether attorney's fees are properly recoverable as mitigation expenses. Defendant simply contends that only a jury could determine whether the amount of legal activity and the fees charged by the Smiths' attorneys in pursuing mitigation were reasonable. Again, we disagree.
A plaintiff has the duty to avoid or minimize the consequences of the defendant's wrong. Miller v. Miller, 273 N.C. 228, 239, 160 S.E.2d 65, 73-74 (1968). Generally, the reasonableness of mitigation efforts depends upon the facts and circumstances of the particular case and is a jury question except in the clearest of cases. See, eg., Radford v. Norris, 63 N.C.App. 501, 503, 305 S.E.2d 64, 65 (1983). Although most of the cases dealing with the reasonableness of mitigation efforts involve defendants who claim plaintiffs have not done enough to mitigate their damages, the principles are the same where, as here, the defendant accuses the plaintiff of doing too much. In this case, the reasonableness of the Smiths' pursuit of mitigation is clear.
From the beginning, the Smiths notified defendant and his insurance carrier that they were taking steps to mitigate their damages, including filing an adversary proceeding in bankruptcy court. In March 1992, the Smiths requested defendant and his insurance carrier either fund the costs of mitigation, take over the bankruptcy case, or release the Smiths from their duty to mitigate. Defendant and his insurance carrier took no further action until after the federal district court issued its opinion in June 1994. Thereafter, defendant agreed to reimburse the Smiths for the cost of pursuing their appeal in the Fourth Circuit. On 6 July 1994, the Smiths sent defendant a letter updating their damages claims, including the $30,135.74 in mitigation expenses incurred from 9 January 1992 through 30 June 1994 for preparation, consultation, travel, deposing eight witnesses, and other charges related to conducting two hearings in the bankruptcy and federal district courts. Defendant stipulated in a letter dated 15 July 1994 that the Smiths had "fulfilled all mitigation obligations which could reasonably be expected of them." Defendant presented no evidence the Smiths' efforts to mitigate their damages were unreasonable. Under these facts, we hold the Smiths' actions in seeking to mitigate their damages were reasonable as a matter of law.
Nor do we find the trial court erred in determining the amount of the expenses was reasonable. Since defendant both stipulated and acknowledged by his inaction that the Smiths' actions in mitigation were reasonable, the only question remaining is whether the costs of such mitigation were reasonable. Here, the costs of mitigation consisted of the attorneys' fees and court costs, detailed in the 6 July 1994 letter and account statement, *234 incurred in pursuing the action in bankruptcy court. Although the Smiths did not seek recovery of attorneys' fees per se, but instead sought recovery for costs spent in mitigation of their damages, the analysis for determining the reasonableness of attorneys' fees is instructive.
In Barker v. Agee, 93 N.C.App. 537, 378 S.E.2d 566 (1989), aff'd in part, rev'd in part on other grounds, 326 N.C. 470, 389 S.E.2d 803 (1990), this Court held the evidence and findings of fact were sufficient to support the reasonableness of an award of attorney's fees where the award was supported by: 1) an affidavit of the plaintiff's attorney and billing statements showing the actual work performed and the hourly rates charged; 2) a finding of fact as to the reasonable amount of time required for the services performed; and 3) a finding of fact as to the reasonableness of the hourly rates charged. Id. at 544, 378 S.E.2d at 571. In this case, the record contains an affidavit from the Smiths' attorney and an attached nineteen page statement of account detailing each charge from January 1992 to July 1994. Defendant does not argue and has not assigned as error that any of these charges are inappropriate or incorrect and has stipulated that the Smiths' efforts at mitigation were reasonable. Therefore, no finding of fact to determine the reasonableness of the amount of time required to perform the services was required. As a result, defendant's only challenge is to the reasonableness of the hourly rates charged by the Smiths' attorneys.
In his affidavit, the Smiths' lead attorney testified billing was based upon actual time expended multiplied by the attorney's hourly rate. The attorney further testified he charged $150 per hour, and the other attorneys from his firm who worked on this case charged $125 per hour and $90 per hour. The only evidence presented in opposition to the reasonableness of the fees charged was defendant's affidavit and the affidavit of another attorney stating that "[i]n [their] opinion, one hundred twenty-five dollars ($125.00) per hour is the maximum hourly rate ordinarily and customarily [charged] for civil litigation in this Judicial District."
First, defendant's evidence only concerns "civil litigation in this area" and does not bear on the ordinary and customary fee charged for bankruptcy litigation in federal courts. Second, even if this evidence does reflect standard charges for federal litigation, the Smiths' attorneys' overall charges fall below this threshold. Of the 214.9 total hours charged, 114.3 were charged at the rate of $150 per hour, 13.7 hours at $125 per hour, and 86.9 hours at $90 per hour, for a total charge of $26,678.50 in attorney's fees. If the Smiths' attorneys had all charged at the $125 per hour "maximum hourly rate ordinarily and customarily" charged, the total would be $184 more than the total fees actually charged. Therefore, the record contains no genuine issue of material fact regarding the reasonableness of the hourly fees charged by the Smiths' attorneys. The record does contain sufficient evidence to support the trial court's judgment that the attorneys' fees charged, and therefore the Smiths' mitigation expenses, were reasonable as a matter of law.
For the reasons stated, the order and judgment of the trial court is affirmed.
Affirmed.
JOHNSON and JOHN C. MARTIN, JJ., concur.
JOHNSON, J., participated in this opinion prior to his retirement on 1 December 1996.
