How to Audit Your CAM Charges

For commercial tenants — whether you operate a retail store, a medical office, a franchise location, or a professional services firm — CAM charges represent a significant and often unpredictable expense. Studies consistently show that a meaningful percentage of CAM reconciliation statements contain errors, and those errors almost always result in tenants paying more than they should.

Whether you're spending $5,000 or $50,000 per year on CAM, a systematic review of your charges can uncover billing mistakes that directly affect your bottom line. Here's how to approach it.

Step 1: Know Your Lease

Before you can audit your CAM charges, you need to understand what your lease says about them. Pull out your lease and look for sections that cover:

• Definitions of operating expenses — What costs does the lease allow the landlord to pass through? Broad definitions give landlords more latitude. Narrow, specific definitions protect tenants.
• Exclusions — What costs are explicitly excluded from CAM? Common exclusions include capital expenditures, leasing commissions, and costs covered by insurance proceeds.
• CAM caps — Does your lease limit annual CAM increases? If so, is the cap cumulative or non-cumulative?
• Audit rights — Almost every commercial lease grants tenants the right to inspect the landlord's books. Look for the specific process, deadlines, and any limitations.
• Base year or expense stop — Some leases only charge tenants for CAM increases above a base year amount.

Pay particular attention to vague language. Phrases like "including but not limited to" in the operating expense definition give landlords broad discretion to include costs you may not have anticipated.

Step 2: Gather Your Documents

You'll need:

• Your signed lease (including all amendments)
• The most recent annual CAM reconciliation statement
• Prior years' reconciliation statements for comparison
• Monthly CAM payment records

Having your lease and reconciliation statement side by side is critical. The whole point of a CAM audit is comparing what the landlord charged against what the lease allows.

Step 3: Verify Your Proportionate Share

Check that the pro rata share percentage on your statement matches what your lease specifies. This step is critical because a proportionate share error affects every single expense category on your statement. Common errors include:

• Using the wrong square footage for your space
• Using the wrong total building square footage
• Not adjusting for vacant space when the lease requires gross-up provisions
• Applying different share percentages to different expense categories without lease basis

Even a small error — say, 4.2% instead of 4.0% — compounds across every expense category and every year of the lease.

Step 4: Review Each Expense Category

Go line by line through the reconciliation statement and ask these questions for each expense:

1. Is this expense category permitted under the lease?
2. Does the amount seem reasonable compared to prior years?
3. Are there any year-over-year spikes that aren't explained?
4. Could this be a capital expenditure that shouldn't be passed through?
5. Are management fees being calculated at the correct percentage?

Red Flags to Watch For

• A single expense category jumping 20% or more in one year
• New line items that didn't appear in previous years
• Roof repairs, parking lot resurfacing, or HVAC replacements charged as operating expenses instead of capital items
• Administrative fees charged on top of management fees
• Insurance premiums increasing faster than market rates
• Management fees applied to expenses the lease excludes from the fee calculation

Step 5: Check for Excluded Costs

Compare the reconciliation statement against the exclusions listed in your lease. Be aware that reconciliation statements don't always use the same terminology as the lease — a cost your lease excludes under one name might appear on the statement under a different label. Common costs that leases typically exclude but that sometimes appear on statements:

• Costs to prepare space for a new tenant (buildout, TI work)
• Marketing or advertising for the property
• Leasing commissions and broker fees
• Depreciation or debt service payments
• Costs covered by insurance proceeds or warranties
• Legal fees for disputes with other tenants

Step 6: Verify CAM Cap Compliance

If your lease includes a CAM cap, verify that the year-over-year increase doesn't exceed the cap. This requires knowing:

• Which expenses the cap applies to (controllable expenses only, or all CAM?)
• Whether the cap is cumulative (compounds from a base year) or non-cumulative (applies year to year)
• Whether taxes and insurance are included in or excluded from the cap

CAM cap calculations are one of the most commonly misapplied provisions in commercial leases. For a deeper look at how caps work, see our guide to CAM caps.

Step 7: Exercise Your Formal Audit Rights

If you find issues, your lease likely gives you the right to formally inspect the landlord's books. Most leases require you to notify the landlord in writing within a specific timeframe (often 60-120 days after receiving the reconciliation).

For larger discrepancies, consider hiring a professional CAM auditor. Many work on a contingency basis — they only get paid if they find savings.

How LeaseGuard Helps

Before committing to a formal audit, it's valuable to do a preliminary review to determine whether a deeper look is warranted. LeaseGuard lets you upload your lease and CAM reconciliation statement, then automatically cross-references the two documents to flag potential issues — from excluded cost pass-throughs to pro rata share errors to CAM cap violations. This kind of initial screening can help you decide whether to exercise your formal audit rights and gives you specific items to investigate further.

Key Takeaways

• Start every audit by reading your lease's CAM provisions carefully
• Verify your proportionate share before reviewing individual expenses
• Compare each expense category against prior years and against lease permissions
• Check that excluded costs haven't been included
• Don't overlook CAM cap compliance — it's commonly misapplied
• Exercise your audit rights when the numbers don't add up