Construction materials costs are running 6.0% above their 2024 baseline because of tariffs, and total project costs are up 3.0% on top of that.[1] Office fit-out costs across the Americas rose 5.5% year over year to $149 per square foot, and 79% of contractors expect labor and material costs to keep climbing over the next six months — none expect them to fall.[2] A roof gets patched, a parking lot gets resurfaced, an HVAC plant gets a mid-life overhaul, and the bill for it gets allocated across the tenants who share the building through the common area maintenance pool. Whether the allocation was done correctly is a question almost nobody actually checks, even though the clause that lets a tenant check it runs on a clock — and that clock starts ticking whether or not the tenant noticed the statement arrive.
That clause is the CAM audit right, and it is one of the more quietly punitive provisions in a commercial lease — not because of what it grants, but because of what it takes away the moment a deadline passes.
A CAM audit right is not a standing entitlement. It is a countdown, and the landlord doesn’t have to remind you it started.
The window is short, and it starts the day the statement arrives, not the day you notice a problem. Most leases give a tenant a limited period to challenge a CAM reconciliation — commonly one to three years, and in California, frequently just 30 to 90 days after the annual statement is delivered.[3][4] The clock runs from delivery, not discovery. A tenant that opens the statement, files it, and gets back to running its business has often already used up most of the window before anyone on staff looks at the numbers.
Miss it, and the statement becomes true by default. Leases with a short audit window typically pair it with “deemed final” language: if the tenant doesn’t object in writing within the stated period, the landlord’s numbers stand, whether or not they were ever correct. One real estate attorney describes these as “short-fuse” clauses for a reason — the remedy for a legitimate overcharge doesn’t degrade gradually, it disappears on a specific date.[4]
The errors being missed aren’t rounding noise. The most frequent patterns are structural, not incidental: capital expenditures — a roof or parking-lot replacement — billed into the operating pool as if they were repairs, instead of amortized over their useful life; management fees that exceed the cap the lease actually sets; pro-rata shares calculated off a stale denominator after the building added square footage; and gross-up provisions applied to fixed costs instead of the variable, occupancy-sensitive ones they were written for, which inflates the tenant’s share instead of protecting it.[3] None of these show up as an obviously wrong number on the statement. They show up as a correctly formatted number that was built on the wrong input.
Why the incentive to make these errors is getting stronger, not weaker.
A landlord facing rising materials and fit-out costs has two ways to keep the pool of recoverable expenses looking normal: control spending, or classify more of the spending as recoverable. Recharacterizing a capital project as a repair — the single most common error pattern in CAM audits — is the second path, and it gets more attractive every time replacement costs jump the way they have in 2026.[1][2][3] That doesn’t require bad faith. It requires an accounting judgment call made under cost pressure, made the same way in year after year, until an audit right that was never exercised makes it permanent.
Why one caught overcharge rarely stays isolated. A tenant who does audit and finds a misclassified capital item finds it in one year’s statement, but the same classification choice is usually baked into the landlord’s accounting for every tenant in the building, and often for prior years the audit window has already closed on. Catching it early is worth more than the dollar figure in front of you — one CAM audit that catches management-fee stacking alone has been reported to save 15% to 20% off the total bill, year over year, for as long as the lease runs.[4] Reading the CAM article closely turns out to matter for the same reason the operating expense clause matters when a cost that used to only go up starts going down: the line item that looks like routine accounting is the one place the actual dollars are decided.
Knowing which reconciliation just started a clock you haven’t looked at#
The hard part of a CAM audit right was never disputing a number once you’ve found it wrong. It’s knowing, across a portfolio, which reconciliation statements arrived this quarter, what each lease’s audit window actually is, and how many days are left before this year’s numbers become unchallengeable — the kind of tracking that’s easy for one lease and unmanageable for fifty. That’s the gap Acrebase is built to close: it parses leases into structured data, extracts the exact audit window and notice requirements from the operating expense article, and flags the deadline before it passes rather than after, with every figure traced back to the source clause.
Acrebase also applies a firm’s approved clause library and negotiation playbook automatically, so a tenant’s standard ask — a longer audit window, a cap on retroactive gross-up, an explicit capital-versus-operating exclusion list — gets proposed the same way on every lease a team negotiates, instead of depending on which associate drafted which redline. Its AI, trained on prior negotiations, can also flag when an incoming CAM reconciliation looks structurally similar to a pattern the firm has disputed and won before.
The practical takeaway: if you’re a tenant, find your CAM audit window today, not the week the statement is due — and calendar it the moment each year’s reconciliation arrives. If you’re a landlord, decide on purpose how capital items get classified and apply that rule consistently; the alternative isn’t avoiding a dispute, it’s negotiating a longer audit window into the next lease because the last tenant caught you inconsistent.
Footnotes
[1] Cushman & Wakefield, “The Impact of Tariffs on U.S. CRE Construction Costs” (April 2026) — current tariff rates as of April 7, 2026 estimated to increase construction materials costs 6.0% and total project costs 3.0%, relative to a 2024 baseline. https://www.cushmanwakefield.com/en/united-states/insights/the-impact-of-tariffs-on-cre-construction-costs
[2] Cushman & Wakefield, 2026 Cost Guide press release, “Office Fit-Out Costs Across the Americas Rise 5.5% as Contractors Expect Further Increases” (2026) — fit-out costs up 5.5% year over year to $149 per square foot; 79% of contractors expect labor and material costs to rise over the next six months, none expect declines; Class A tenant improvement allowances increasing as landlords respond to higher build-out costs. https://ir.cushmanwakefield.com/news/press-release-details/2026/Office-Fit-Out-Costs-Across-the-Americas-Rise-5-5-as-Contractors-Expect-Further-Increases-According-to-Cushman--Wakefields-2026-Cost-Guide/default.aspx
[3] Real.dev, “How to Audit Common Area Maintenance Charges” — common CAM overcharge patterns including capital expenditures billed as operating repairs, management fees exceeding contractual caps, stale pro-rata shares, and gross-up provisions misapplied to fixed rather than variable expenses; audit windows commonly one to three years with written notice requirements. https://www.real.dev/blog/cam-reconciliation/how-to-audit-common-area-maintenance-charges
[4] Leeran S. Barzilai, A Professional Law Corporation, “California Commercial Lease CAM Audit & Overcharge Recovery” — California commercial leases commonly limit the audit right to 30-90 days after the annual reconciliation statement, after which the statement is treated as “deemed final”; example of a $150,000 parking-lot resurfacing billed in full instead of amortized over a 15-year useful life, producing a $140,000 overcharge in year one; management-fee-stacking audits reported to save tenants 15-20% on their total CAM bill. https://lbatlaw.com/california-commercial-lease-cam-audit-overcharge/
Acrebase is AI-powered contract intelligence for commercial real estate — clause extraction, risk flagging, and portfolio-wide search, plus tools for maintaining a consistent clause library and negotiation playbook across every deal a team runs. Learn more at acrebase.com, or get in touch about pricing.