CAM Charges: A Guide to Common Area Maintenance

What Are CAM Charges?

CAM charges are additional fees commercial tenants pay, on top of base rent, to cover the cost of maintaining and managing shared spaces within a property. They’re divided among tenants based on their proportionate share of the total leasable area, and they’re intended to keep the cost of common-area upkeep, cleaning, landscaping, security, and repairs, shared fairly across everyone who benefits from those spaces.

What’s Included in CAM Charges?

CAM charges typically fall into five categories:

What’s actually included varies by property type. Retail properties, for instance, typically include delivery areas and loading docks in CAM; industrial properties usually don’t, since those areas are exclusive to individual tenants rather than shared.

How Are CAM Charges Calculated?

Most CAM charges use one of three methods, and the lease should specify which one applies:

• Pro rata share: the most common method. A tenant’s CAM charge is their percentage of the building’s total leasable square footage, applied to the total annual CAM expense.
• Fixed percentage: the landlord assigns each tenant a set percentage that stays constant for the lease term, regardless of actual occupancy shifts elsewhere in the building.
• Gross-up provision: adjusts CAM charges upward when the building isn’t fully occupied, so a handful of tenants aren’t stuck covering costs that assume full occupancy.

The pro rata formula:

Pro Rata Share (%) = Tenant’s Rentable Square Footage ÷ Gross Leasable Area

Tenant’s Annual CAM = Pro Rata Share (%) × Total Annual CAM Expense

Monthly CAM Payment = Annual CAM ÷ 12

Worked example: A retail center’s total annual CAM expense is $250,000. A tenant leases 1,500 square feet in a 10,000-square-foot building.

Pro Rata Share = 1,500 ÷ 10,000 = 15%

Annual CAM = 15% × $250,000 = $37,500

Monthly CAM = $37,500 ÷ 12 = $3,125

CAM Charges by Lease Type

Who pays for CAM, and how much, depends entirely on the lease structure:

NNN leases are the most common structure for office, retail, and industrial space; gross leases are more typical for multifamily and some smaller office arrangements.

For how each of these lease structures works beyond CAM, see our triple net lease guide and the broader commercial rent structure guide.

Controllable vs. Uncontrollable CAM Expenses

CAM expenses generally split into two categories, and this distinction matters most when a lease includes a cap on CAM increases:

• Controllable expenses: costs the landlord has direct influence over, like administrative costs and staff payroll. These are usually the ones subject to a negotiated cap.
• Uncontrollable expenses: costs outside the landlord’s control, like snow removal after a major storm or emergency repairs following a fire. These are often excluded from caps, since neither party can predict or manage them.

Knowing which bucket a given cost falls into is often the first thing worth checking when a CAM increase looks larger than expected.

CAM Fee Price Caps and Floors

Many leases include a cap, sometimes called a price ceiling, that limits how much CAM charges can increase in a single year, commonly a fixed percentage like 3-5% annually. Caps typically apply to controllable expenses only; uncontrollable costs often pass through in full regardless of the cap.

Some leases also include a floor: a minimum guaranteed increase each year, even if actual CAM expenses stay flat or decline. A floor protects the landlord from having to absorb a shortfall in a year where costs happen to come in low, while a cap protects the tenant from an unpredictable spike. Reviewing both before signing is one of the more overlooked parts of negotiating the CAM section of a lease.

Is Capital Expenditure Included in CAM?

Generally, no, capital expenditures are excluded from CAM. Discretionary property improvements, like building a new amenity space, are typically treated as the landlord’s cost of ownership, not a shared maintenance expense. The exception is non-discretionary capital spending that benefits all tenants directly, like replacing a failed HVAC system that serves the whole building. Whether a specific capital cost qualifies as CAM depends on the lease language, so this is worth checking closely rather than assuming either way.

CAM Reconciliations and Recoveries

Landlords typically estimate CAM expenses at the start of each year as part of the building’s annual budget, then bill tenants monthly based on that estimate. At year-end, the landlord reconciles the estimate against actual expenses incurred, a process often called a CAM recovery, CAM reconciliation, or billback.

If actual expenses came in higher than estimated, tenants owe the difference. If they came in lower, tenants typically receive a credit or refund. This reconciliation is where most CAM disputes originate, since it’s the point where estimated numbers meet actual invoices, and it’s worth reviewing carefully every time it happens, not just when something looks obviously wrong. Our CAM reconciliation template gives you a standard format for running that year-end check across every property.

How to Handle a CAM Charge Dispute

If a CAM charge looks inaccurate or inconsistent with the lease, the standard path is:

• Review the lease agreement to confirm what’s actually included in CAM and how it’s supposed to be calculated.
• Request supporting documentation from the landlord or property manager, itemized invoices, not just a summary total.
• Raise it directly with the property management team before escalating further.
• Bring in a CPA or real estate attorney if the disagreement persists after direct discussion.
• Consider mediation or arbitration as a lower-cost alternative to litigation if direct resolution fails.

Most CAM disputes get resolved at step 2 or 3, once actual documentation is on the table instead of a lump-sum number.

Are CAM Charges Included in ASC 842 Lease Accounting?

This is a question real estate teams rarely ask but finance teams have to answer for every lease: is CAM a lease component or a non-lease component under ASC 842?

CAM is generally treated as a non-lease component, since it represents a service (maintenance of shared space) rather than the right to use an identified asset, which is what defines a lease component. That distinction matters because lease and non-lease components are, by default, accounted for separately, with only the lease component driving the right-of-use asset and lease liability calculation.

ASC 842 does include a practical expedient allowing lessees to elect, by asset class, not to separate lease and non-lease components, combining them into a single lease component instead. That election simplifies the accounting but also means CAM charges get folded into the ROU asset and lease liability calculation rather than expensed separately as incurred. Whether to elect that expedient is a policy decision finance should make deliberately, not by default, since it changes how CAM shows up on the balance sheet, not just how it’s tracked operationally.

For the full mechanics of lease vs. non-lease components and this practical expedient, see our ASC 842 guide.

What to Look for in the CAM Section of a Lease

Before signing, the CAM section of a lease should clearly answer:

• What’s included, and just as importantly, what’s explicitly excluded
• Which calculation method applies: pro rata, fixed percentage, or gross-up
• Whether there’s a cap, a floor, or both, and which expenses they apply to
• How often reconciliation happens and what documentation you’re entitled to see
• What the dispute resolution process looks like if a charge is contested

Why CAM Management Is a Real Estate and Finance Problem

CAM sits right at the seam of the two-team compliance gap. Real estate negotiates the CAM terms, the cap, the calculation method, what’s included, but finance is the one reconciling estimated versus actual charges every year and deciding how CAM gets treated in the ASC 842 lease vs. non-lease component election. When those two functions aren’t working from the same lease data, CAM reconciliations turn into a manual reconstruction project instead of a routine check.

Occupier keeps CAM terms, caps, and reconciliation history in the same system real estate and finance both use, so a CAM increase that looks off gets caught against the actual lease language, not an estimate pulled from memory.

See how Occupier tracks CAM terms alongside your lease accounting →

CAM Charges FAQs

What does CAM stand for? Common Area Maintenance. CAM charges are fees tenants pay to cover the cost of maintaining shared spaces in a commercial property.

Are CAM charges considered rent? Not typically in the traditional sense; they’re usually billed as a separate line item from base rent, though the lease agreement determines exactly how they’re categorized and whether they factor into rent escalation calculations.

Are CAM charges included in a 1099? This depends on how the payment is structured and reported; landlords and tenants should confirm treatment with a tax professional, since it can vary based on whether CAM is billed separately or bundled into a single rent figure.

How do you calculate CAM charges? Divide the tenant’s rentable square footage by the building’s gross leasable area to get the pro rata share, then multiply that percentage by the total annual CAM expense.

What’s the difference between CAM charges and operating expenses? CAM is typically one category within a broader set of operating expenses, which can also include property taxes and insurance billed separately, depending on the lease.

Can a landlord increase CAM charges without limit? Only if the lease doesn’t include a cap. Many leases limit annual CAM increases to a fixed percentage, though caps often apply only to controllable expenses, not uncontrollable ones like storm damage or emergency repairs.

What is a CAM recovery? The year-end process of reconciling estimated CAM charges billed throughout the year against actual expenses incurred, resulting in either an additional charge or a credit to the tenant.