What Are Common Area Maintenance (CAM) Charges?
In commercial real estate, tenants often focus on the quoted rental rate first. That makes sense. But the quoted rent alone rarely tells the full story.
One of the most important additional costs to understand is CAM, or common area maintenance. Depending on the property and lease structure, CAM can materially affect a tenant's total occupancy cost. It can also become a source of confusion later if it is not clearly defined during negotiations.
What is a CAM Charge in Commercial Real Estate?
Common Area Maintenance (CAM) charges—sometimes referred to as additional rent or expense recoveries—are fees that commercial property owners and landlords pass through to their tenants. Unlike base rent, which is a fixed charge for the physical space a tenant occupies, CAM charges are variable.
These fees are designed to cover the operating expenses incurred for operating, maintaining, and servicing the shared portions of a commercial property that benefit multiple tenants, ensuring that all occupants share the cost of keeping the property safe, clean, and functional.
What is Included in CAM?
"CAM" can mean slightly different things depending on the market and the specific lease agreement. Generally, landlords prefer to define CAM charges broadly to pass through most of their operating expenses, while tenants try to negotiate a narrower definition to keep occupancy costs low.
Typical CAM inclusions cover:
Maintenance and Repairs: Costs for routine upkeep such as parking lot maintenance (resurfacing, striping, lighting), sidewalk repairs, and maintenance of elevators, hallways, and lobbies.
Groundskeeping and Landscaping: Lawn care, tree trimming, and snow removal.
Janitorial Services: Cleaning of common-area restrooms, common areas, and shared facilities.
Utilities: Electricity, water, and gas used in common areas or shared building systems.
Security: Costs for security personnel or systems that protect the property.
Administrative & Property Management Fees: A percentage of operating costs or gross rents as outlined in the management agreement.
Other Operating Expenses: Depending on the lease structure, CAM may also encompass property taxes and insurance premiums.
The exact list will vary by property type, market practice, and lease wording. That is why tenants should review CAM definitions carefully rather than relying on assumptions. Two buildings in the same market may have very different CAM structures. Also, the way CAM is defined or used in practice could simply be labeled "Operating Expenses" or be a catch-all to include insurance, taxes, and other pass-through items.
In the Twin Cities market, it is used differently all the time (which is confusing to tenants if they do not have the proper guidance). In short: define, define, define.
How Are CAM Charges Calculated?
In most multi-tenant buildings, CAM is allocated based on each tenant's pro rata share of the building or project. In plain terms, that usually means the tenant pays a percentage of shared expenses based on the amount of rentable area they occupy.
The formula generally looks like this:
Tenant's Pro-Rata Share = Tenant's Rentable Square Footage/Total Rentable Square Footage of the Property
For example, if you lease a 2,000-square-foot retail space in a 10,000-square-foot building, you are responsible for 20% of the building's eligible common area maintenance costs.
That sounds simple, but the details matter. Some costs may apply only to certain tenants, certain phases of a project, or certain shared systems. The lease also controls how the denominator is calculated and which expenses are actually recoverable.
Why Tenants Should Review Their Statements
Two spaces can show similar base rents and still have meaningfully different total occupancy costs. A property with heavier operating needs, more amenities, older systems, or broader pass-through language may carry significantly higher CAM charges than another option that looks similar at first glance (again, this hints back to the important concept of the total cost of occupancy).
That is why tenants should understand exactly how CAM is defined before signing the lease.
Why Lease Language Matters So Much
CAM is not a standardized line item across the market. It is lease-specific.
Some leases define CAM narrowly. Others define it broadly and allow more operating expenses to be passed through. Some leases separate controllable and uncontrollable expenses. In some instances, tenants can place caps on certain categories. You may have audit rights (the ability to annually review CAM costs), while other leases may be limited in the ability to review or challenge costs.
That is where careful review matters. A few lines of lease language can materially change what a tenant pays over the life of the deal.
What a CAM Reconciliation Means in Practice
In many leases, tenants pay estimated CAM charges each month during the year. Once the year closes, the landlord compares those estimates to the actual expenses incurred. That process is the CAM reconciliation, sometimes called a true-up. To understand this in more detail and its full implications, read our full article about CAM reconciliations.
The Practical Takeaway About CAM
CAM is not just background lease terminology. It is a real cost, and in some properties, a significant one.
For tenants, understanding CAM leads to better comparisons, more accurate budgeting, and fewer surprises after lease execution. For landlords, clear CAM language can reduce disputes and create a more transparent relationship with occupants.
The most important takeaway is simple: quoted rent alone is not enough to understand your full occupancy costs, and getting a clear definition on how CAM is handled in each building you are considering is incredibly important. Modern CRE places great importance on this step as part of its tenant rep advisory. We’re happy to answer any questions or expertly advise you on your current or next lease.