What Are CAM Charges? The Landlord's Complete Guide
CAM charges are how commercial landlords recover the cost of operating shared building areas from tenants. Understanding what's recoverable — and what isn't — is the foundation of accurate reconciliation.
By Angel Campa, Founder, CapVeri · Updated April 2026
Quick Answer: What Are CAM Charges?
CAM (Common Area Maintenance) charges are the landlord's pass-through of operating expenses for shared building areas to tenants under NNN and modified gross leases. Tenants pay a pro-rata share — their leased square footage divided by the building's total rentable area — of the recoverable expense pool. Landlords collect estimated payments monthly throughout the year and reconcile against actual costs annually.
What CAM Charges Cover
CAM charges originate from expenses that benefit all tenants in a building or complex — not the private space any single tenant occupies. The specific list of recoverable expenses is defined by the lease, but most NNN and modified gross leases include a similar core set of operating costs.
In a 100,000 SF office building running $12/SF in annual operating expenses, the total CAM pool would be approximately $1.2 million per year. A tenant occupying 10,000 SF with a 10% pro-rata share would receive a CAM bill of roughly $120,000/year — collected as $10,000/month in estimated payments, then trued up after year end.
| Expense Category | Typical Line Items | Recoverable? |
|---|---|---|
| Janitorial & Cleaning | Common area cleaning, window washing, pressure washing | Typically Recoverable |
| Landscaping & Grounds | Lawn maintenance, irrigation, seasonal plantings, snow removal | Typically Recoverable |
| Parking & Exterior | Lot striping, asphalt patching, lighting, drainage | Typically Recoverable |
| Property Insurance | General liability, property, umbrella policies | Typically Recoverable |
| Real Estate Taxes | Annual property tax assessments, special assessments | Typically Recoverable (often a separate pass-through) |
| Property Management Fee | Management company fee, usually 3–6% of gross revenues | Typically Recoverable (subject to lease cap) |
| Common Area Utilities | Shared HVAC, lobby/corridor lighting, elevator power | Typically Recoverable |
| Security | Guard service, access control systems, CCTV monitoring | Typically Recoverable |
| Elevator & Mechanical | Preventive maintenance contracts, minor repairs | Typically Recoverable |
| Capital Improvements | Roof replacement, HVAC unit replacement, parking lot resurfacing | Often Excluded (or amortized over useful life) |
| Mortgage Interest & Debt | Financing costs, ground lease payments, debt service | Often Excluded |
| Leasing Costs | Broker commissions, tenant improvement allowances, free rent | Often Excluded |
| Income & Franchise Taxes | Corporate taxes on landlord income | Often Excluded |
| Tenant-Specific Costs | Buildout work, dedicated HVAC for a single tenant | Often Excluded |
Always verify the specific exclusion list in each lease. The table above reflects market norms — individual leases frequently negotiate broader or narrower exclusion lists.
The Estimate–Reconciliation Cycle
CAM charges flow through a two-phase annual cycle: monthly estimates collected in advance, followed by an annual reconciliation that trues up actual versus estimated costs. Landlords who understand this cycle avoid the most common billing disputes.
Budget and set the estimate (January, lease year start)
Using prior-year actuals and vendor contract renewals, the landlord calculates projected recoverable expenses for the upcoming year. Each tenant receives an updated monthly CAM estimate, usually issued alongside the lease year renewal or 60 days before the new year begins.
Collect monthly estimates throughout the year
Tenants pay their estimated CAM amount with each month's base rent payment. These are advance payments — not the final bill. Collecting $8,500/month from a tenant whose annual true-up will be $102,000 is routine; the estimate is intentionally set close to the expected actual.
Close the books and classify GL entries (January–February)
After December 31, the property's accountant runs the full GL report, reviews each line item against the lease's recoverable expense definition, and backs out any non-recoverable costs. This step is where most billing errors originate — misclassifying a capital replacement as a maintenance expense, for example.
Apply gross-up, caps, and base year adjustments
If the lease contains gross-up provisions, variable expenses are normalized to the lease's occupancy threshold. CAM caps are applied to limit the tenant's year-over-year obligation increase. For base-year leases, only expenses above the base year amount are charged.
Send reconciliation statements (February–April)
The landlord issues a CAM reconciliation statement to each tenant showing the full calculation: actual recoverable expenses, pro-rata share percentage, adjustments, total obligation, estimated payments already collected, and the net true-up amount owed or credit due.
Collect true-ups and set next year's estimate
Tenants pay any amount owed (or receive credits) within the lease's cure period — typically 30 days. The reconciled actual expenses then form the basis for the next year's estimate, with a reasonable escalation factor.
What Can Go Wrong
Misclassifying Capital Replacements as Operating Maintenance
Replacing a chiller or resurfacing an entire parking lot is a capital improvement under most leases — not a recoverable operating expense. If these costs flow through the GL as "repairs and maintenance" and get included in the CAM pool, tenants are overbilled for costs they contractually don't owe. This is one of the most common findings in tenant CAM audits, and it creates credits — with interest — when caught.
Using the Wrong Denominator for Pro-Rata Calculations
Different leases in the same building may define the denominator differently — one tenant's lease uses total rentable area (say, 120,000 SF), while another's uses total leasable area (95,000 SF after common area deductions). Applying a single building-wide denominator to all tenants without checking each lease overcharges tenants with smaller denominator definitions and undercharges others.
Ignoring Lease-Specific Exclusions When Pooling Expenses
A tenant may have negotiated an exclusion for management fees above 3%, while the landlord is billing at 5%. Or a tenant's lease excludes insurance for earthquake coverage in a California building. When those line items are included in the building-wide CAM pool without being excluded per that tenant's lease, the tenant receives an overbilling statement that any competent audit firm will immediately flag.
Frequently Asked Questions
What are CAM charges in a commercial lease?
CAM charges are the landlord's pass-through of operating expenses for shared building areas to tenants under NNN and modified gross leases. Tenants pay a pro-rata share — their leased SF divided by the building's total rentable area — of recoverable operating costs including cleaning, landscaping, insurance, property taxes, and management fees.
What is typically included in CAM charges?
Recoverable CAM expenses typically include janitorial and cleaning, landscaping, parking lot maintenance, exterior lighting, security services, property insurance premiums, real estate taxes, common area utilities, snow removal, property management fees (subject to a lease cap), elevator maintenance, and routine repairs. Capital improvements are usually excluded unless the lease permits amortization.
What is excluded from CAM charges?
Common exclusions include capital improvements and replacements, ground lease payments, financing and mortgage interest, leasing commissions, tenant improvement allowances, income and franchise taxes, depreciation, management fees above the contractual cap, and any costs attributable to a specific tenant. The exact list depends on each lease's exclusion clause — always verify per tenant.
How often are CAM charges reconciled?
Most commercial leases require annual CAM reconciliation, issued within 60–120 days after the fiscal year closes. For calendar-year properties, Q1 (January–April) is peak reconciliation season. Landlords who miss the deadline specified in the lease may lose the right to collect underpayments for that year — a provision many tenants actively monitor.
Related Resources
How to Calculate CAM Charges
Formula, gross-up, caps, and worked examples with real numbers.
CAM Reconciliation Explained
The 6-step reconciliation cycle from GL export to true-up billing.
CAM Reconciliation Process Guide
Timeline, checklists, and documentation requirements.
CAM Gross-Up Calculator
Model gross-up across multiple occupancy thresholds.
Find CAM Billing Errors Before Tenants Do
CapVeri audits your CAM reconciliations automatically — catching misclassified capital items, wrong denominators, and missed lease exclusions from your Yardi or MRI export. No integration required.
Get Started Free