Every year between January and April, commercial tenants receive a CAM reconciliation statement from their landlord. The statement shows what the landlord claims it cost to operate the building last year, the tenant's share of that cost, and whether the tenant overpaid or underpaid through their monthly estimates.
Most tenants receive this statement, compare it to their payment history, and write the check. The process takes about fifteen minutes.
That is a problem. The statement itself can take months to prepare and may contain calculation errors, excluded expenses that were included anyway, or a denominator that quietly changed. I built CAMAudit because I wanted a repeatable, systematic way to check these statements — and after testing reconciliation samples from published audit cases through CAMAudit, the same ten problem areas kept coming up.
This checklist covers all ten. Work through it before you pay.
40% of CAM reconciliations contain material errors (Tango Analytics / PredictAP, 2023)
The Checklist
1. Verify Your Pro-Rata Share Percentage Matches the Lease
Your lease specifies your pro-rata share as either a fixed percentage or a formula. Most commonly it is your rentable square footage divided by the total rentable square footage of the building (or your floor, or the defined common area, depending on how your lease is structured).
Pull that clause. Calculate the percentage yourself using the square footages your lease states. Compare it to the percentage the landlord used on the reconciliation.
Even a fraction of a percentage point matters. On a $500,000 annual expense pool, a 0.5% error in your pro-rata share means $2,500 added to your bill. Over a five-year lease, that compounds.
2. Check the Expense Denominator
This is related to pro-rata share but distinct. The denominator question is: which square footage did the landlord use to divide the total expense pool?
Common errors here include using "occupied" square footage instead of "total leasable" square footage, or excluding certain portions of the building (sometimes an anchor tenant's space) from the denominator in ways your lease does not authorize.
Your lease should specify the denominator. If it says "total rentable area of the building," verify the landlord used the full building square footage — not just the occupied portion or just the in-line tenant space.
If the denominator is smaller than it should be, your share is larger than it should be.
3. Compare the Management Fee Rate to Your Lease Cap
Most leases cap the management fee at a specific percentage — typically 3% to 5% of gross revenues or allowable expenses. Some landlords apply a higher rate than the cap. Others apply the correct rate but to an expense base that includes items the lease does not permit.
Find your management fee cap. Calculate what that percentage of the eligible base should produce. Compare to the management fee line on the reconciliation.
If your lease says 4% of "allowable operating expenses," the fee should equal 4% of the sum of all other allowed lines. If the landlord has applied 4% to a number that includes expenses the lease excludes — capital expenditure items, reserves, excluded service categories — the fee calculation is inflated.
4. Identify Any CapEx-Sounding Line Items
Capital expenditure items — roof replacements, HVAC system overhauls, parking lot repaving, elevator modernizations — are almost universally excluded from CAM in well-drafted leases. Routine maintenance is passable; structural improvements and major capital projects generally are not.
Scan the statement for large one-time items, especially in roofing, structural, mechanical, or paving categories. Then ask yourself: is this a repair or a replacement? Replacing the roof membrane is capital. Repairing a section of it may be maintenance.
The distinction matters enormously. A $400,000 roof replacement passed through as "roof maintenance" adds real money to your true-up bill. If the work was capital in nature, your audit rights give you the right to see the invoices and make that determination.
5. Check Your CAM Cap Math
If your lease includes a CAM cap, this step is critical. CAM caps limit how much your CAM contribution can increase year over year, typically expressed as a fixed percentage (often 5-7%) or tied to CPI.
The math here has several variables: is it a cumulative cap or a simple annual cap? What was the base year amount the cap applies to? Does the cap apply to all controllable expenses or to all CAM expenses including taxes and insurance?
Run the cap calculation yourself. Your CAM cap clause should specify exactly which expenses are subject to the cap and what the base amount was. If the landlord's number exceeds what the cap permits, you have a clear, math-based overcharge.
This is one of CAMAudit's direct calculation checks — the system runs the cap formula from your lease and compares it to the billed amount.
6. Look for Excluded Expense Categories
Your lease almost certainly excludes certain expense categories from CAM entirely. Common exclusions include:
- Costs to attract or retain tenants (leasing commissions, tenant improvement allowances)
- Expenses covered by insurance proceeds
- The landlord's income taxes, franchise taxes, or corporate overhead
- Debt service on the building's mortgage
- Costs to correct pre-existing code violations
- Expenses attributable solely to vacant space
Read your exclusions list carefully. Then look at the CAM statement for any line item that could plausibly fall into an excluded category. "Marketing" expenses, "leasing costs," "administrative fees," and "professional fees" are common places where excluded items get buried.
7. Compare to Last Year's Statement
Pull your prior year reconciliation statement and compare line by line. Look for:
- Any new line items that did not appear last year — what are they?
- Any line items that increased by more than 10-15% without an obvious explanation
- Any line items that disappeared — did a legitimate expense stop, or did it get reclassified somewhere else?
Year-over-year comparison is not about finding errors directly — it is about identifying anomalies worth investigating. A 40% increase in "building engineering" costs in a year with no reported capital work is a question worth asking.
8. Verify Your Estimated Payments Were Properly Credited
This one seems obvious, but it gets missed. The reconciliation should show your total estimated payments (monthly CAM charges you paid throughout the year) and subtract them from the total calculated obligation.
Confirm that figure matches your actual payment records. If you paid $4,200 per month for twelve months, your estimated payments should be credited as $50,400. If the statement credits a different number, that discrepancy is yours to claim.
Also check for any lump-sum adjustment payments you made during the year — midyear true-ups, correction payments, or anything that was outside the normal monthly billing cycle.
9. Check the Reconciliation Delivery Date Against Your Audit Window
This is the clock-management step. Your lease specifies a deadline by which the landlord must deliver the annual reconciliation — often 90 to 180 days after year-end. Many leases also specify a window during which you can dispute the statement or invoke your audit rights — typically 12 to 24 months after delivery.
Write down the date on the statement. Count forward to your dispute deadline. If you received the statement but never noted the deadline, you may have less time remaining than you think.
Some leases also include a provision that if the landlord fails to deliver the reconciliation by the deadline, the landlord waives the right to collect a true-up for that year. If your landlord delivered late, check whether that provision applies.
The statute of limitations and the lease's own audit window work together to create a hard deadline. Do not let it pass without at least reviewing the statement.
10. Note Any Large Unexplained Increases
After working through items 1-9, step back and look at the total. Did the overall CAM amount increase significantly compared to prior years? What drove the increase?
If total CAM is up 20% and you cannot attribute that increase to specific, documented causes — a major repair, a known utility rate increase, a property tax reassessment — that is a flag. Get the backup documentation for the largest line items before you pay.
What to Do If You Find Something Wrong
If you work through this checklist and identify a discrepancy, do not simply withhold payment. That creates its own legal exposure.
Instead:
Request documentation. Under your audit rights, you are entitled to see the underlying invoices and records supporting each line item. Submit a written request specifying which line items you want documented.
Calculate the specific dollar impact. Vague complaints go nowhere. A specific, quantified error — "the management fee was calculated at 5.2% rather than the 4% cap specified in Section 8.3(b) of the lease, resulting in a $3,100 overcharge" — gets attention.
Send a written dispute. Preserve your rights in writing before any applicable deadline expires. Your dispute does not need to be aggressive; it needs to be documented and specific.
Use a dispute letter with lease references. The dispute letter draft CAMAudit generates cites the specific lease provisions involved and the calculation showing the error. That is more useful than a general complaint letter.
"Most tenants treat CAM reconciliation as a final bill rather than a statement to be verified. The difference between those two approaches is often thousands of dollars per year. Working through a systematic checklist before paying takes less than an hour and protects you from errors that compound over the life of the lease." — Angel Campa, Founder of CAMAudit
Upload Your Statement Instead
If going through this checklist manually sounds like a lot, that is the point of CAMAudit. You upload your lease and your CAM reconciliation statement. Our system runs all fourteen detection rules — including the pro-rata share verification, the CAM cap calculation, the management fee check, and the base year analysis — and returns a report showing what was flagged and why.
The audit runs in under fifteen minutes. It costs $79 for a single reconciliation. If it finds an overcharge of $3,000, the ROI is obvious. If it finds nothing, you have documentation that the statement checked out — which is also worth something.
CAM reconciliation season comes every year. This checklist takes less time than the phone call you will make to your attorney after you discover an error three years too late.
Run through it before you pay.