CAM charges, explained for small tenants

Updated October 27, 2026 · General information, not legal advice.

Common area maintenance charges, or CAM, are often the least understood part of a small business lease. They can change every year, they arrive as estimates, and they are settled with a reconciliation months later. This guide covers what CAM usually includes, what is often excluded, and how to read your annual statement.

How to use this guide: read it with your own lease or proposal open beside you. Lease labels and "standard" terms vary from property to property and from landlord to landlord, so treat everything here as a list of things to look for and questions to ask, not as a description of what your document says. When a section of your lease is unclear, ask the landlord or its representative to explain it in writing, and keep notes of what was agreed.

What CAM is

CAM is your share of the cost of running the shared parts of a property. In a shopping center or multi-tenant building, that usually means parking lots, walkways, landscaping, exterior lighting, shared restrooms or corridors, trash areas, and security. Many leases also put property management fees and sometimes property taxes and insurance into the same bucket, often labeled "operating expenses." In a triple net lease, CAM is one of the three nets.

How CAM is billed

Most landlords estimate a year of CAM costs, divide it by your pro rata share, and bill you monthly with your rent. After the year ends, they compare actual costs to the estimate and send a reconciliation. You either owe more, or you should get a credit.

Your pro rata share is usually your square footage divided by the property's total square footage. Look at how the lease defines both numbers. Some leases use "gross leasable area," some use only occupied space, and some exclude large anchor tenants from the denominator, which can increase smaller tenants' shares.

What is commonly included

Parking lot maintenance, sweeping, striping, and repairs
Landscaping and irrigation
Common area utilities and lighting
Snow removal, where relevant
Security and common area janitorial
Trash removal for shared enclosures
Repairs to common areas
Property management or administrative fees

What tenants commonly ask to exclude

The exclusions list is where much of the negotiation happens. Tenants often ask that these be excluded from CAM, or at least limited:

Capital improvements and replacements (or require them to be amortized over their useful life)
Costs to fix construction defects
Costs to prepare space for other tenants, and leasing commissions
The landlord's financing costs, such as loan interest and principal
Legal fees for disputes with other tenants
Costs covered by insurance, warranties, or other tenants
Penalties or fines caused by the landlord
Salaries of executives above the property manager level

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Not every landlord will accept every exclusion, but the list is a useful starting point for a conversation.

Caps on CAM increases

Some leases cap how much "controllable" CAM can increase from year to year. Controllable usually means costs the landlord manages, such as landscaping or janitorial. Uncontrollable costs like taxes, insurance, and utilities are often excluded from the cap. Check whether the cap is cumulative (unused increases carry forward) or non-cumulative, and which costs count as controllable.

Reading your annual reconciliation

When the reconciliation arrives, take a few steps:

Compare it to the prior year. Look for any category that jumped.
Check that your pro rata share and square footage are correct.
Look for one-time or capital items that your lease may exclude.
Check the management fee calculation against the lease.
Confirm your monthly estimate payments are credited correctly.
Note the deadline to dispute. Some leases give a limited window, so calendar it.

Audit rights

Many leases give tenants the right to review the landlord's books for CAM. The lease may limit who can perform the review, how often, and who pays for it. Some leases shift the cost to the landlord if the overcharge is over a set threshold. Even without a formal audit, asking politely for backup on a specific line item is common and often resolves questions.

Before you sign: CAM questions to ask

What were actual CAM costs for the last two to three years?
What is included, and what is excluded?
How is my pro rata share calculated?
Is there a cap on controllable increases?
How are capital costs treated?
When will I receive the reconciliation, and how long do I have to dispute it?
Do I have audit rights?

Frequently asked questions

Why did I get a bill after the year ended?

That is the reconciliation. Your monthly payments were based on an estimate. If actual costs were higher, the lease usually lets the landlord bill the difference.

Can I negotiate CAM in a small lease?

Often, yes, at least on exclusions, caps, and audit rights. Raising it early, in the letter of intent, usually helps.

Are CAM and NNN the same thing?

CAM is usually one part of NNN charges. NNN typically also includes property taxes and building insurance.