When a tenant disputes a CAM charge: how to respond

A tenant’s dispute of a CAM statement is a request for the derivation of a number, and the right response is to provide it: the lease clause that governs the request, the general ledger detail behind the pool, the exclusion schedule, the gross-up worksheet, the occupancy by month, the square-footage denominator, the base-year computation and the cap history, in the form the lease specifies and within the time it allows. Most disputes are about how the number was reached rather than how large it is, and a statement whose working can be produced on request resolves the majority of them without anyone conceding anything. The minority — where the working reveals an error — are handled by correcting the error for every tenant it affected, not only the one who asked.

This post is written from the landlord’s accountant’s side and tries to be fair to both. It goes through what the audit-right clause usually says, what the tenant’s letter will ask for and what to send, the findings tenant auditors make most often, how to handle a legitimate error and an illegitimate claim, and why the relationship usually survives the dispute if the derivation does. The sample statement is an example of a statement built to answer the letter before it arrives.

What the audit clause usually says

The tenant’s right to question the statement comes from the lease, and the clause has a recognizable shape across lease forms. The figures below are the common ranges in practitioner and law-firm sources; the lease decides, and the first thing to do on receiving a letter is to read the clause rather than remember it.

Three of those rows change the tone of the response. The notice window is a right the landlord can assert, but asserting it against a tenant whose objection is a week late and substantively correct is a way to win the clause and lose the tenant; most landlords answer the question anyway and reserve the point. The contingency-fee exclusion exists because an auditor paid a share of what they find has an incentive to find things, and a landlord is entitled to ask how the auditor is paid before opening the ledger. The cost threshold is where a dispute acquires a dollar value for the auditor: on Brightleaf Yoga’s $12,000 recoverable, a 5% threshold is $600, and a finding of that size shifts the auditor’s fee to the landlord, which is why findings cluster around the threshold.

What the letter will ask for

A tenant’s auditor works from the statement back to the ledger, and the request list is predictable because it mirrors the steps of the reconciliation. Expect to be asked for each of the following, and have them ready before the letter arrives.

Send the documents in the order of the reconciliation, with a short cover schedule that ties the ledger total to the pool, the pool to the grossed-up pool, the grossed-up pool to the tenant’s share, and the share to the statement. A set of PDFs with no schedule connecting them makes the auditor rebuild the derivation, and an auditor who rebuilds it will find the differences between their rebuild and your statement before they find anything else. Where the lease says the inspection happens at the landlord’s office, it is still usual to send the schedule and the worksheets and keep the raw ledger for the visit.

A statement that already contains the five things a tenant will ask — what was in the pool and what was taken out, what was grossed up and to what occupancy, what the share and denominator are, what the cap did and what room remains, what was paid in estimates — turns most of this table into a reference to a page the tenant already has. What a CAM reconciliation actually involves sets those five questions out, and the sample statement answers them in that order.

What auditors find

Tenant auditors report the same findings across property types, and the list is useful on the landlord’s side as a pre-audit of the statement before it goes out.

• Capital in the pool. A replacement posted to repairs and never excluded. Harbor Point’s $180,000 roof in 6800 Repairs & Maintenance is the example; at 8.00% it is $14,400 on one tenant and well over any cost-shifting threshold.
• Management fee on excluded costs. A fee computed as a percentage of gross expenses before exclusions, so the tenant pays a fee on the roof it is not paying for. The fee base should be the pool after exclusions, or the base the lease names.
• Gross-up applied to fixed costs. The whole pool multiplied by the occupancy factor. At Harbor Point that is $112,500 of expense nobody incurred, and it is the easiest finding to make because the worksheet shows one factor on one total. Gross-up clauses, explained covers the correct form.
• Denominator wrong after a lease change. A suite remeasured, a tenant expanded, a building added to the campus, and the shares still computed on last year’s rentable area. Each tenant’s share should be rentable area over a denominator the lease defines, and the denominator should be the same number on every tenant’s statement for the same group.
• Base year never grossed up. The comparison year grossed up to 95% and the base year left at actual occupancy; on Brightleaf the difference is $6,160 a year for the rest of the term.
• Prior-year credits not applied. A true-up credit from last year’s statement that was never netted against this year’s estimates, or an overpayment refunded on paper and not in the ledger.
• Cap applied as annual when it is cumulative, or the ceiling computed from the wrong base year or the wrong mechanic. CAM caps: cumulative, non-cumulative and compounding has the five-year tables.
• Services billed and not performed, or billed twice. A contract invoiced monthly and also accrued at year end; a one-off invoice posted in two periods.

None of these is arithmetic. Each is a classification, a basis or a sequence decision, and each is visible in the derivation if the derivation exists. The statement that survives audit is not the one with the best arithmetic; it is the one whose decisions are written down next to the numbers they produced.

When the tenant is right

A legitimate finding is corrected, and the correction has three parts.

The first is the tenant who asked. Recompute the statement with the error removed, issue a corrected statement, and settle the difference by credit against the next estimates or by refund if the lease has ended or the tenant asks, within the time the lease allows for settling a reconciliation — 30 days is common. Interest is owed only if the lease provides for it, and some do, at a stated rate from the date of overpayment; where the lease is silent, interest is a negotiating point rather than an obligation, and a landlord who wants the relationship often offers it on a material error. If the error exceeds the cost-shifting threshold, the auditor’s reasonable fee is owed under most clauses, and the clause usually says what “reasonable” excludes.

The second is every other tenant. An error in the pool is an error in every share computed from the pool, in proportion. The $180,000 roof wrongly left in the pool was 8.00% of $180,000 to Brightleaf and 13.16% of it, $23,688, to Atlas Wealth Partners, and 7.67%, $13,806, to Meridian Title Co., and 6.43%, $11,574, to Harbor Cafe, and the same to the two tenants who did not write. A landlord who corrects only the tenant who asked has a statement on file that is known to be wrong for five others, and the next audit will find that it was known. The correction reopens the year for everyone, which is the strongest reason to re-run the whole year rather than adjust one line, and to do it through the same process that produced the original so that the corrected statements carry the same derivation.

The third is the following years. An error in a base year, in a cap history or in a denominator does not stay in the year it was found. A base year that was never grossed up has overstated every statement since; a cap ceiling computed from a wrong actual has shifted every later ceiling under a prior-actual or cumulative mechanic. The correction has to be traced forward to the current year, and the lease’s record-retention and limitation periods decide how far back the tenant can reach, which is a question for counsel when the amounts are material.

When the tenant is wrong

An illegitimate claim is usually one of three kinds. The first is a reading of the lease the lease does not support: a tenant arguing that security is controllable when the clause lists it as uncontrollable, or that the management fee is excluded when it is allowed up to a limit. The answer is the clause, quoted, with the computation shown against it. The second is an auditor applying a market norm rather than the lease — a “standard” exclusion list, a “typical” management fee percentage — to a lease that says otherwise. The answer is the same: the lease decides, and the published lists are negotiating positions, not terms. The third is a request that is out of time or outside the clause, which the landlord may decline and usually should answer anyway, reserving the point in writing.

What the landlord should not do is refuse to produce the derivation on the ground that the claim is wrong. A tenant who is told the number is right and cannot see why has not been answered, and an auditor who is denied documents the lease entitles them to has a finding before they have opened a ledger. Produce the working, show where the claim departs from the lease, and keep the correspondence; if the matter goes to the referee or the arbitrator the clause names, the file that shows a prompt, complete and courteous response is the landlord’s best evidence.

Keeping the relationship

Most disputes are about derivation rather than dollars. The tenant’s controller has a statement with a number on it that moved from last year, no explanation of why, and a deadline to object; the letter is the only tool the lease gives them. A response that arrives within a week, in the order of the reconciliation, with a schedule that ties every figure to the one before it, answers the real question — can I trust this — regardless of what it says about the dollars. A response that arrives on day 29 with a stack of invoices and no schedule answers a different question, and not in the landlord’s favor.

The practical habits are few. Keep an inquiry log recording each question, who answered it, what was sent and when, and whether the statement changed. Answer the question the tenant asked before the one the auditor implied. Where the statement was wrong, say so in the first paragraph and put the correction in the second. Where it was right, show the working rather than asserting the result. And set next year’s estimates from this year’s actuals, because a true-up large enough to surprise a tenant is the most common reason the letter gets written at all.

What turns the dispute into a lookup

Every document in the request table above exists, or should, at the moment the statement is produced. A reconciliation that keeps its working — the exported ledger it started from, the exclusion schedule with its lease citations, the gross-up by account, the denominator, the base-year schedule on the same basis, the cap history per year — has already written the response; what remains is to send it. A reconciliation that discards its working when the statement goes out has to reconstruct it eighteen months later, usually by someone who did not build it, and reconstruction is a negotiation entered without evidence. That is the difference a derivation-first system makes. In Ledgerstone the reconciliation shows the derivation behind every figure and the period is sealed once the statements go out, so a question about 2026 is answered by opening 2026 as it was, and the tenant, through the portal, can open the statement and see the derivation before writing the letter at all.

Related reading

• What a CAM reconciliation actually involves — the five questions a defensible statement answers.
• The CAM reconciliation checklist — step 13, the dispute window, on the calendar.
• Recoverable vs. non-recoverable expenses: the list — the list the auditor’s first finding usually comes from.
• Gross-up clauses, explained with the arithmetic — the worksheet the auditor asks for second.