Every spring, retail and office tenants in the United States open a piece of mail from their landlord that resets the next twelve months of rent. It's called a CAM reconciliation statement, and most tenants — even sophisticated ones — sign off on it without auditing. They shouldn't.
What CAM is, in plain terms
CAM stands for “Common Area Maintenance.” In a Triple Net (NNN) or modified gross lease, the landlord estimates the building's shared operating expenses each year and bills each tenant their pro-rata share monthly. At year end, the landlord reconciles the estimate against actual spend and either bills you for the shortfall or credits you for the overage.
The reconciliation isn't the bill itself — it's the mechanism that adjusts the bill. And the difference between estimated and actual is regularly five figures on a 5,000-sqft retail unit.
What gets included in CAM
- Property taxes (often a separate “Tax” line, but conceptually similar)
- Insurance premiums for the property
- Common-area utilities — parking lot lighting, lobby HVAC, etc.
- Repair and maintenance — landscaping, snow removal, paving, roof patches
- Management fees (usually capped as a % of CAM)
- Trash, security, fire-protection contracts
What shouldn't be there
The reconciliation is where landlords sometimes pad. Watch for:
- Capital improvements. A new roof or repaved lot is a capital expense, not maintenance — unless your lease explicitly amortizes it over its useful life.
- Marketing for vacant space. Leasing commissions and tenant-improvement allowances belong on the landlord's books, not yours.
- Ground-lease rent. If the landlord doesn't own the dirt, the ground-lease rent is theirs to pay, not pass through.
- Owner's overhead. Salaries above the on-site property manager, executive bonuses, audit fees for the parent company — none of these should appear.
- Costs reimbursed by insurance. If insurance paid for the casualty repair, it can't also be CAM.
- Any line item without a back-up invoice on request.
The audit window — your most-missed deadline
Almost every commercial lease gives the tenant a window to audit the reconciliation, typically 12 to 24 months from the date the statement is delivered. Miss the window and the reconciliation is deemed accepted, even if it includes things it shouldn't.
Five red flags in a reconciliation
- CAM jumps more than 8% year-over-year with no explanation in the cover letter
- Management fee exceeds the cap stated in your lease
- A new line item appears that wasn't in last year's reconciliation
- Your pro-rata share changes — usually it shouldn't
- The landlord refuses to provide back-up invoices when asked
How to audit (the short version)
Request back-up. Most leases give you an explicit right to it. Pull the lease language for what's allowed in CAM and walk through each line item. For multi-tenant properties, you can often share an audit cost across tenants — landlords budget for this and it's within everyone's rights.
For high-value disputes, bring in a CAM auditor. They typically charge 30-50% of any recovery, contingent. The math usually works.
What LeaseBrief does
We extract the CAM cap, audit window, exclusions, gross-up provisions, and base-year mechanics into structured fields with citations. The audit-window expiration appears on your critical dates timeline — you get a reminder before it expires, not after.
See the full list in our guide to 21 critical dates or read our full abstraction methodology.