An operating cost audit request usually means a tenant wants the numbers explained better, not that fraud is suspected. Treating it as routine — because it is — is what keeps it that way.
Key takeaways
An audit request letter reads, to a landlord unfamiliar with commercial lease mechanics, like an accusation. In practice it's usually the opposite — a tenant exercising a right the lease specifically gives them, most often because a reconciliation number moved more than they expected and they want to see the underlying support rather than take the summary statement on faith. Handling it as a routine, contractual process is what keeps it exactly that.
Commercial leases commonly give tenants a defined window to “inspect the landlord's operating-cost records — typically within 12–18 months of receiving the annual reconciliation statement.” That window matters in both directions: a tenant who lets it lapse may forfeit the right to challenge that year's statement at all, and a landlord that treats every late-arriving question as an open-ended audit request, regardless of the lease's own deadline, is giving away a protection it's entitled to rely on.
The audit's own cost is typically allocated based on what it finds. A landlord's books that turn out to be accurate usually leave the tenant covering the cost of having checked; a meaningful overcharge often shifts it the other way. “Overcharges beyond a threshold (3–5%) may trigger landlord coverage of audit costs,” which gives both sides a reason to keep the underlying records clean rather than treat a reconciliation statement as something that only gets real scrutiny if a tenant happens to push back.
Three things, consistently, regardless of the specific lease: whether costs were correctly classified as includable operating costs rather than capital expenditures or another tenant's specific responsibility — Treadstone Law's own lease-review guidance flags exactly this, warning tenants to watch for “capital replacements recovered as an operating cost rather than amortised over their useful life”; whether the tenant's proportionate share was calculated on the correct rentable area; and whether any gross-up adjustment applied was calculated on the right inputs — actual costs, actual occupancy, and the lease's own target percentage. A landlord that can produce clean support for all three rarely has an audit turn into a protracted dispute.
A response sequence that keeps the audit routine
Confirm the request is inside the lease's audit window before scheduling anything — a late request is a different conversation from a timely one.
Provide the scope the lease actually grants, no more and no less — some leases limit inspection to the landlord's own offices during business hours, or to a named professional acting on the tenant's behalf rather than the tenant directly.
Have the classification and allocation logic ready, not just the raw invoices — the underlying arithmetic is usually what an auditor is actually testing.
Settle the audit-cost allocation once findings are in, against whatever variance threshold the lease specifies, rather than negotiating it up front.
This is close to what settled a comparable CAM dispute elsewhere in this portfolio — not a better argument on the merits, but records that were ready before the auditor asked for them.
The landlords who find operating cost audits the least disruptive are, consistently, the ones who never treat the annual reconciliation statement as the end of the process. A cost-tracking system that already separates capital from operating spend at the point of entry, that codes each invoice to the correct tenant-recoverable category, and that keeps the occupancy figures used for any gross-up calculation on file month by month, doesn't need to reconstruct any of that under time pressure once a formal audit request lands. The audit, at that point, becomes a matter of producing records that already exist in the right shape — not building a defence from scratch.
The same discipline pays off outside of audits too. A landlord who can walk a tenant through a routine CAM reconciliation clearly, with the classification and allocation logic visible rather than buried, generates fewer formal audit requests in the first place — most tenants invoke the audit right because a number wasn't explained well enough, not because they specifically suspect the books are wrong.
A tenant was billed $42,000.00 for its share of CAM and TMI for the year and requests an audit within the lease's 15-month window. The tenant's accountant finds a 4% overcharge — inside the lease's 3–5% threshold for shifting audit costs to the landlord. The correct amount, recomputed, is $40,384.62 ($42,000.00 divided by 1.04), meaning the tenant was overcharged by $1,615.38. Because the overcharge falls within the lease's stated 3–5% band, the landlord covers the audit's professional fees in addition to crediting the $1,615.38 back to the tenant — the outcome the lease's own threshold was built to produce.
Only within what the lease permits — many leases require the tenant to use a licensed accountant or a specific class of professional, and some restrict the engagement to a review of the landlord's records rather than a full independent audit. Confirm the lease's own definition of who may conduct the inspection before a tenant retains someone.
Most leases are silent on recovering an undercharge discovered through a tenant-initiated audit, which can leave the landlord without a clean contractual mechanism to collect it retroactively — a reason some landlords prefer to run their own periodic internal reconciliation checks rather than rely solely on tenant-triggered audits to catch errors in either direction.
Generally no, unless the lease specifically says otherwise — the tenant typically continues paying as billed while the audit proceeds, with any overcharge credited or refunded once the audit concludes, rather than payment being withheld while the dispute is worked through.
Not if the lease grants the right and the tenant is exercising it within the stated window and scope — refusing a properly made request is itself a lease breach, distinct from the underlying operating cost dispute. A landlord that has a genuine issue with the timing or scope of a specific request should raise that specific objection rather than declining to engage at all.
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