Before signing a commercial lease, these 15 clauses determine how much you'll pay in CAM for the next 5-10 years. Here's what to look for in each one.
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Find My OverchargesSee a sample report firstMost tenants spend more time negotiating base rent than they spend reviewing the CAM provisions. That is a mistake. Base rent is fixed. CAM charges are variable, they compound over a 5 to 10 year lease, and they are frequently billed incorrectly. The 15 items below determine how much exposure you carry before you ever sign.
What to look for: Does the lease include a cap on annual CAM increases? The cap should specify a maximum percentage increase per year (typically 3 to 5 percent for controllable expenses), whether the cap is cumulative or compounded, and which expense categories fall within the cap.
Tenant-favorable language: Cumulative caps limit total growth over time. A 5 percent cumulative cap means total controllable CAM over year one can never exceed year one multiplied by 1.05 per year elapsed, no matter how much was actually spent. Compounded caps allow those percentages to stack and grow faster. Insist on cumulative language.
Landlord-friendly language to watch for: "CAM shall not exceed X percent above the prior year" without specifying cumulative versus compounded. Also watch for caps that apply only to "controllable expenses" defined so narrowly that most actual expenses fall outside the cap entirely.
What to look for: The lease should specify the maximum management fee as a percentage of something. The "something" matters enormously. A 5 percent management fee calculated on gross revenues is very different from a 5 percent fee calculated on controllable operating expenses.
Tenant-favorable language: Management fee capped at 4 to 5 percent of controllable CAM, with the management fee excluded from the base on which it is calculated. Circular base calculations (fee based on total CAM including the fee) inflate the effective percentage.
Landlord-friendly language to watch for: "Management fee equal to X percent of gross revenues" or "X percent of operating expenses" without excluding the fee itself from the base. Also watch for leases that include management fees with no cap at all.
What to look for: The lease should list specific categories of expenses that the landlord cannot pass through as CAM. A strong exclusions list is one of the highest-value provisions you can negotiate.
Tenant-favorable language: Explicit exclusion of capital improvements and capital expenditures, landlord's overhead and personnel costs above the property level, leasing commissions, tenant improvement costs, depreciation and amortization (except where explicitly agreed), legal fees for landlord disputes, advertising and marketing, financing costs, and income taxes.
Landlord-friendly language to watch for: A vague "reasonable" operating expenses standard with no specific exclusions. Or an exclusions list that only covers a few categories, leaving everything else implicitly included. Always negotiate for specificity.
What to look for: Your pro-rata share percentage determines how much of the building's total CAM you pay. The denominator in that calculation, total rentable area or total occupied area, has a direct effect on your percentage.
Tenant-favorable language: Denominator defined as total rentable area of the building, not total occupied area. An occupied-area denominator means your percentage rises when other tenants vacate. You should not bear a larger CAM share because the landlord has empty space.
Landlord-friendly language to watch for: "Pro-rata share calculated based on occupied or leasable area" without specifying that vacant space is included in the denominator. Also watch for definitions that exclude certain anchor tenants from the denominator without compensating the remaining tenants.
What to look for: If your lease uses a base year structure (common in office leases), the base year establishes the expense floor above which you pay overages. The occupancy level during the base year matters because low occupancy in the base year artificially lowers the baseline, increasing your exposure in subsequent years.
Tenant-favorable language: Base year defined with occupancy-adjusted expenses. If the building was less than 90 percent occupied during the base year, expenses should be grossed up to reflect what they would have been at 90 or 95 percent occupancy. This prevents an artificially low baseline from making every subsequent year look like an expense overage.
Landlord-friendly language to watch for: Base year defined as actual expenses paid without any occupancy adjustment. A building at 60 percent occupancy in the base year has much lower actual expenses than it will in stabilized years, setting a trap for tenants in later lease years.
What to look for: Gross-up provisions allow landlords to project what expenses would have been at full occupancy. The threshold (typically 90 or 95 percent) and the scope (which expenses get grossed up) are both negotiable and both important.
Tenant-favorable language: Gross-up applies only to variable expenses: cleaning, utilities, trash removal, and other costs that genuinely scale with occupancy. Fixed expenses like property taxes and insurance do not change based on occupancy and should never be grossed up. Also look for explicit language limiting gross-up to the threshold occupancy level, not above it.
Landlord-friendly language to watch for: "Operating expenses shall be grossed up as if the building were X percent occupied" without distinguishing between variable and fixed costs. Grossing up insurance and taxes is a common error that many leases permit by not explicitly prohibiting it.
What to look for: Your right to audit the landlord's CAM calculation must be written into the lease. Without an explicit audit rights clause, some landlords will resist providing backup documentation. The clause should specify how many days you have to request an audit after receiving the reconciliation, how far back you can audit (lookback period), and what happens if the audit reveals errors.
Tenant-favorable language: 60 to 90 day audit request window from receipt of reconciliation, 3 to 4 year lookback period, landlord pays your audit costs if errors exceed 5 percent of total charges billed. This cost-shifting provision is the most powerful incentive for accurate reconciliation. For the full legal framework governing what audit rights you have, including implied and statutory rights that apply even without an explicit clause, see the commercial tenant audit rights framework.
Landlord-friendly language to watch for: Short audit windows (30 days or fewer) that make it difficult to complete a review. Lookback periods limited to 1 to 2 years. No cost-shifting provision if errors are found. Provisions requiring "independent certified public accountant" auditors only, which eliminates lower-cost audit tools.
What to look for: The lease should specify when the landlord must deliver the annual reconciliation statement. Without a deadline, landlords can delay indefinitely, compressing your review time and making it harder to dispute.
Tenant-favorable language: Landlord must deliver within 90 to 120 days of year-end. If landlord fails to deliver by the deadline, any true-up payment owed by tenant is waived for that year. This consequence provision gives the deadline real teeth.
Landlord-friendly language to watch for: No delivery deadline specified, meaning the landlord can deliver whenever convenient. Or a deadline with no consequences for missing it, making it unenforceable in practice.
What to look for: How many days do you have after receiving the reconciliation to formally dispute charges? This is separate from your audit right. The dispute window is when you must file or forfeit.
Tenant-favorable language: 60 to 90 days minimum from receipt of the reconciliation statement. The clock should start from actual delivery, not from year-end. An extension provision for cases where backup documentation was not timely provided is also valuable.
Landlord-friendly language to watch for: 30-day windows that leave insufficient time to request documentation, review it, and file a written dispute. Language starting the clock from year-end rather than delivery. Or language stating that payment constitutes acceptance of the charges.
What to look for: Many retail centers exclude anchor tenants (grocery stores, department stores, large-format retailers) from the CAM pool entirely. These tenants often negotiate separate CAM arrangements and contribute directly to certain shared costs. When they are excluded from the denominator, the remaining tenants absorb a larger share of costs.
Tenant-favorable language: If anchor tenants are excluded from the denominator, the lease should require the landlord to contribute an amount equal to what those tenants' pro-rata share would have been. Without this contribution, you pay a higher percentage because of a deal the landlord cut with a bigger tenant.
Landlord-friendly language to watch for: "Certain tenants may be excluded from the denominator at landlord's discretion" without any requirement for the landlord to fill the gap. Or language that allows the denominator to change over time as anchor tenants are added or removed.
What to look for: The lease should specify what types of insurance the landlord can pass through, the coverage types, and ideally a maximum dollar amount or percentage of total CAM.
Tenant-favorable language: Insurance pass-through limited to specific coverage types: property insurance for the building, general liability for common areas, and umbrella coverage at specified limits. Require landlord to provide the actual certificate of insurance and invoice annually so you can verify what is being charged matches what was actually purchased.
Landlord-friendly language to watch for: "Insurance costs as reasonably determined by landlord" without coverage type or dollar limits. Provisions allowing the landlord to self-insure and charge a reserve rather than an actual premium. Insurance deductibles passed through as CAM (common and often inappropriate).
What to look for: Which taxes pass through as CAM? The scope matters. Personal property taxes, special assessments, supplemental taxes from building improvements or a sale, and transfer taxes are all different from the standard real property tax, and they carry very different implications.
Tenant-favorable language: Pass-through limited to real property taxes assessed against the land and building. Special assessments excluded unless directly related to common area improvements. Tax appeal credits: if the landlord appeals a tax assessment and receives a refund, tenants should receive a proportional credit for the period in which they overpaid.
Landlord-friendly language to watch for: "All taxes, assessments, and governmental charges" without exclusions. This language can sweep in transfer taxes from a building sale, supplemental taxes from capital improvements, and other non-recurring charges that should not be a tenant's cost.
What to look for: Which utilities are included in CAM versus billed directly to your meter? Sub-metering language determines whether you pay for actual consumption or a pro-rata allocation of building-wide utility costs.
Tenant-favorable language: Sub-metered electricity and gas billed directly at actual consumption rates. CAM-included utilities limited to common area lighting, HVAC for common areas, and parking lot lighting. Clear definition of which utility services are included in base rent versus CAM versus direct billing.
Landlord-friendly language to watch for: Utilities allocated pro-rata based on square footage without sub-metering, meaning you pay a share of the building's total utility consumption regardless of your actual use. This systematically overcharges efficient tenants to subsidize inefficient ones.
What to look for: The lease's definition of "operating expenses" or "CAM charges" sets the outer boundary of what the landlord can bill. Broad definitions create significant exposure. Narrow definitions with explicit carve-outs protect you.
Tenant-favorable language: "Operating expenses" defined as ordinary, necessary expenses incurred in the day-to-day operation and maintenance of the common areas of the building. Additional carve-outs: expenses for which landlord has received insurance proceeds, depreciation, debt service, income taxes, and items elsewhere specifically excluded.
Landlord-friendly language to watch for: "All costs incurred in connection with the ownership, operation, maintenance, repair, and replacement of the property." This is extremely broad. "Replacement" alone can sweep in what should be capital expenditures.
What to look for: Capital expenditures are improvements that extend the useful life of a building component or add value. They are generally not recoverable as operating expenses under standard accounting and lease principles. What matters is how your lease defines and limits them.
Tenant-favorable language: Capital expenditures excluded from CAM entirely. If any CapEx can be passed through (for example, energy-efficiency improvements that reduce operating costs), require amortization over the improvement's useful life (typically 5 to 15 years per IRS depreciation schedules) with interest at a specified rate. Require landlord to provide documentation of the useful life determination.
Landlord-friendly language to watch for: "Capital expenditures that reduce operating costs may be passed through in full in the year incurred." This allows a landlord to pass through the entire cost of a roof replacement in a single year rather than amortizing it. Also watch for undefined "improvements" that are not clearly distinguished from ordinary repairs and maintenance.
“The single biggest predictor of CAM overcharges I see in reconciliations run through CAMAudit is a poorly defined operating expense clause combined with no management fee cap. Those two provisions together create open-ended exposure. Negotiate both before you sign.”
After reviewing all 15 items, run through these three final questions:
If any answer is no, go back to the negotiating table. These provisions are standard in tenant-favorable leases. Landlords who refuse all three are taking a posture that history shows produces overcharges.
For a deeper review of the audit process once you are in a lease, see our commercial lease audit guide. For negotiation tactics specific to NNN leases, see our NNN lease negotiation tips. The 10 CAM lease clauses with the biggest financial impact, with landlord-favorable and tenant-favorable language shown side by side, are covered in the CAM lease language guide. Once the lease is signed, use the CAM reconciliation review checklist to verify each annual statement against your lease terms. If you find overcharges, the CAM dispute letter template gives you the structure to assert your claim in writing.