What Are CAM Charges in Commercial Real Estate?
CAM charges are operating expense recoveries that commercial landlords bill to tenants under NNN and modified gross leases — reconciled annually against actual building expenses.
Definition
CAM charges (Common Area Maintenance) are operating expense recoveries billed by commercial landlords to tenants under NNN and modified gross leases. They represent the tenant's proportionate share of costs to operate and maintain shared building areas and systems, reconciled annually against actual expenses.
By Angel Campa, Founder, CapVeri · Last updated: March 2026
Avg $6.50/SF
BOMA survey of 4,400+ properties nationwide
15–30%
of CAM bills contain errors (IREM research)
12-month
audit window in most commercial leases
What Expenses Are Included in CAM Charges?
The lease defines what is recoverable. These are the most common inclusions and exclusions across NNN commercial leases.
Typically Recoverable
- Janitorial and cleaning
- Parking lot maintenance and snow removal
- Landscaping and grounds maintenance
- Building exterior maintenance
- Common area electricity and lighting
- HVAC for common areas
- Elevator maintenance
- Security and pest control
- Property insurance premiums
- Property management fees (capped)
- Property taxes (in some leases)
Typically NOT Recoverable
- ✕Capital expenditures (roof/HVAC replacement)
- ✕Debt service and mortgage payments
- ✕Leasing commissions and tenant improvements
- ✕Above-market management fees
- ✕Depreciation
- ✕Interior improvements for other tenants
How Are CAM Charges Calculated?
CAM reconciliation follows six steps from identifying recoverable expenses to issuing the annual statement.
Identify total recoverable expenses for the year
Pull all operating expenses from the GL and exclude non-recoverable items per the lease: CapEx, debt service, leasing commissions, depreciation, and any above-market management fees.
Calculate tenant's pro-rata share (tenant RSF ÷ total leasable RSF)
The denominator is defined in the lease — typically total leasable RSF, though some leases use total building RSF. Using the wrong denominator is one of the most common billing errors.
Apply gross-up adjustment (if occupancy < threshold, normalize to 90–95%)
Gross-up applies only to variable expenses (janitorial, utilities) — not to fixed costs like taxes and insurance. Verify the occupancy threshold and the gross-up formula in the lease before calculating.
Apply CAM cap (if lease has cap provision on controllable expenses)
Caps limit year-over-year increases in controllable expenses. Cumulative caps carry unused cap room forward. Non-cumulative caps reset each year. Verify the cap structure, base year, and which expenses are capped.
Subtract tenant's paid monthly estimates (CAM advances)
Monthly CAM estimates collected throughout the year are subtracted from the annual actual obligation. Estimates are set based on prior-year actuals or the landlord's budget.
Issue reconciliation statement (overpayment → credit, underpayment → true-up)
If actual CAM exceeds estimates, the tenant owes a true-up. If estimates exceeded actuals, the landlord issues a credit or refund per the lease's reconciliation terms.
Example Calculation
A 5,000 SF tenant in a 50,000 SF building has a 10% pro-rata share. If the building's recoverable CAM expenses total $400,000 after gross-up, the tenant's annual CAM obligation is $40,000 ($8.00/SF).
CAM Charge Benchmarks by Property Type
Use these ranges to identify outliers in your portfolio or to evaluate a reconciliation statement before paying.
| Property Type | Typical CAM Range | Key Cost Drivers |
|---|---|---|
| Office | $6–$10/SF/yr | HVAC, security, common area cleaning |
| Retail / Shopping Center | $4–$8/SF/yr | Parking lot, landscaping, common area |
| Industrial / Warehouse | $1–$3/SF/yr | Minimal common areas, exterior only |
| Medical Office | $8–$14/SF/yr | HVAC, compliance, specialized cleaning |
| Mixed-Use | $5–$9/SF/yr | Varies by use mix |
Sources: BOMA Experience Exchange Report, IREM Income/Expense Analysis. Figures reflect U.S. national averages.
Common CAM Billing Errors Landlords Make
Non-recoverable expenses in the pool
CapEx items, depreciation, and debt service included in the CAM pool inflate tenant charges. These are among the most common and highest-dollar errors found in reconciliation audits.
Gross-up applied incorrectly
Using the wrong occupancy threshold or applying gross-up to non-variable expenses (taxes, insurance) overstates the normalized expense pool. At $500K of variable expenses, a single threshold error can drive a $14,000+ overbilling.
CAM cap not enforced
Controllable expense cap exceeded without tracking the cumulative cap bank. When landlords fail to apply the cap, tenants pay more than the lease allows — a clear audit dispute trigger.
Wrong pro-rata share denominator
Using total building RSF instead of total leasable RSF (or vice versa) can shift thousands of dollars between tenants annually. The denominator definition is set by the lease, not convention.
Tenant Rights to Audit CAM Charges
Most commercial leases include an audit right that allows tenants to challenge CAM reconciliation statements. Understanding this right — and exercising it within the required window — is the most effective way to recover overbillings.
12-month audit window
Most leases require tenants to request an audit within 12 months of receiving the annual reconciliation statement. Missing this deadline typically waives the right.
Written request required
The audit request must usually be submitted in writing and specify which year(s) are being challenged. Review the lease for the exact notice requirements.
Landlord must provide documentation
Upon a valid audit request, the landlord must produce GL detail, invoices, and supporting documentation for the reconciled expenses. Refusal is grounds for dispute.
Dispute resolution process
If the audit reveals overbillings, most leases specify a cure period and dispute resolution mechanism — typically mediation before litigation. Document every finding with GL line references.
Frequently Asked Questions About CAM Charges
What are CAM charges in a commercial lease?
CAM charges (Common Area Maintenance charges) are a tenant's proportionate share of operating expenses for the common areas and building systems of a commercial property. Under NNN and modified gross leases, landlords recover these costs annually through a reconciliation process. Typical CAM expenses include janitorial services, landscaping, parking lot maintenance, HVAC repairs, property insurance, and property taxes.
What is a reasonable CAM charge per square foot?
Typical CAM charges range from $3–$12 per square foot annually, depending on property type. Office buildings average $6–$10/SF; retail/shopping centers average $4–$8/SF; industrial/warehouse properties average $1–$3/SF. These figures vary significantly by market, building age, and what expenses the lease defines as recoverable.
Can tenants dispute CAM charges?
Yes. Most commercial leases grant tenants an audit right — typically a 12-month window after receiving the annual reconciliation statement — to review the landlord's books and challenge errors. Common grounds for dispute include non-recoverable expenses included in the pool, incorrect pro-rata share calculations, gross-up applied incorrectly, or CAM caps not enforced.
How often are CAM reconciliations done?
CAM reconciliations are typically performed annually, within 90–180 days after the end of the calendar year. During the year, tenants pay monthly CAM estimates (also called CAM advances). The annual reconciliation statement compares actual expenses to estimates and results in either a true-up payment from the tenant or a credit from the landlord.
What is gross-up in CAM charges?
Gross-up is an adjustment that normalizes variable operating expenses to what they would cost at a specified occupancy level — typically 90%–95%. When a building has vacant space, costs like janitorial and utilities are lower. Gross-up ensures tenants pay their fair share of the 'fully occupied' cost, preventing tenants in occupied buildings from subsidizing vacancies.
What expenses are typically excluded from CAM?
Non-recoverable CAM exclusions typically include: capital expenditures (roof replacement, major HVAC systems), debt service and mortgage payments, leasing commissions and tenant improvement allowances, above-market management fees (capped at 3%–5% of revenues in most leases), depreciation, and expenses for other tenants' specific spaces.
Find Errors in Your CAM Reconciliation
CapVeri audits CAM statements from Yardi, MRI, and AppFolio exports — no integration required. First audit is always free.