CAM Leakage: The Hidden Threat to NOI and Asset Valuation

One of the most overlooked financial drags on a property's performance is tenant expense leakage. This leakage occurs when operating expenses that directly benefit tenants—like parking lot maintenance, landscaping, or security—go unreimbursed under the lease. And while it may seem minor at first glance, the long-term impact on Net Operating Income (NOI) and asset valuation is profound.

CAM leakage is not usually due to an explicit exclusion in lease language. Rather, it's the result of caps on “controllable” Common Area Maintenance (CAM) expenses. These provisions are typically negotiated under the guise of tenant expense predictability—but in reality, they create chronic losses for landlords.

How Leakage Is Embedded in Leases

The industry-standard approach to structuring CAM reimbursements involves categorizing expenses into “controllable” and “uncontrollable” buckets. Uncontrollable expenses—property taxes, insurance premiums, and snow removal—are generally excluded from caps because landlords have no influence over them. Controllable expenses, however—such as general maintenance, landscaping, and exterior lighting—are often subject to fixed annual caps, commonly around 3%–5% growth per year.

Here’s the issue: while labeled "controllable," many of these expenses are only theoretically within the landlord’s control. In practice, many are reactive and demand-driven. If a sidewalk heaves due to frost, or a drainage line backs up, repairs must happen immediately to avoid tenant liability or safety risks. These are not discretionary expenses.

Worse still, inflation and supply chain volatility—especially in service industries like paving, irrigation, and even trash removal—can cause unexpected cost surges. For example, after the COVID-19 pandemic and ensuing labor shortages, many vendors began instituting 10–15% annual cost increases. When a landlord is contractually limited to 5% CAM recovery, the delta must be absorbed as leakage—and over time, that adds up to significant NOI erosion.

The Compounding Effect of No “Catch-Up” Clause

The most damaging form of leakage occurs when leases include growth caps without a cumulative or “banking” provision. This clause, if included, allows landlords to apply unused cap growth from a previous year to offset future year overages. Without it, any year in which CAM expenses grow beyond the cap results in leakage—even if previous years had expense growth well below the cap.

Consider this common scenario:

• A lease includes a 5% CAM cap.

• In Year 1, CAM increases by 1%—the landlord can recover the 1%.

• In Year 2, CAM increases by 7%—the landlord can only recover 5%, absorbing 2% as leakage.

  
  

Now, although the cumulative two-year increase is 8%—well under the 10% allowable if each year had hit the 5% cap—the landlord cannot use the 4% underage from Year 1 to make up for the 2% overage in Year 2.  Additionally, even if CAM expenses increase by only 2% in Year 3, the landlord cannot apply the unused 3% of cap capacity from that year to recover amounts lost in Year 2.  Each year’s cap is applied independently, and therefore the 2% shortfall becomes a permanent loss.    

This issue is magnified because commercial leases are long-term agreements, often with tenant renewal options that extend the lease without resetting the CAM structure. A significant expense increase in a single year can therefore reduce recoveries for many years. In some cases, the landlord may not fully restore proper expense recovery until the tenant vacates and a new lease is negotiated. What appears to be a one-year CAM cap issue can ultimately create a long-term reduction in property cash flow.

Why Tenants Demand CAM Caps—and Why Landlords Must Push Back

To be clear, tenants often have valid reasons for requesting CAM caps:

• Expense Predictability: Particularly for national retailers and franchisees with rigid budgeting cycles.

• Alignment of Incentives: Caps theoretically force landlords to be disciplined about cost control.

  
  

But here’s the problem: while these reasons are sound in theory, they don’t reflect the reality of operating a dynamic, physical asset. CAM expenses are not flat or linear—they spike due to weather, labor market constraints, supply and demand of materials, or even unexpected vandalism. Even “routine” maintenance like re-striping or LED conversions can swing budgets unexpectedly.

The ultimate irony is that tenants benefit from the very repairs and maintenance that caps often underfund. They want clean, safe, well-maintained centers—but balk at paying their fair share. If a tenant insists on cost predictability but refuses to include a catch-up mechanism, it’s fair to say they’re not negotiating in good faith.

How to Protect Yourself

1. Avoid Caps When Possible: Particularly for newer tenants or smaller operators, seek to remove growth caps altogether. When tenants understand the nature of CAM costs—and how they are shared—some will accept a more equitable structure.

   
   

2. Demand Cumulative Catch-Up Clauses: If you must agree to a cap, ensure it includes a mechanism to “bank” unused expense growth in one year and recoup it in later years when actual increases climb above the cap. This clause must be airtight and well-defined.

   
   

3. Avoid Fixed CAM Estimates in Ground-Up Projects: Anchor tenants often demand set CAM numbers long before operations begin. At that stage, operating costs are still unknown—and a bad estimate becomes permanent leakage from Day One. Insist on flexibility or post-opening true-ups.

   
   

4. Audit and Model CAM Language in Acquisitions: When acquiring a shopping center, don’t just look at the reimbursement rate—look at the cap structures and whether catch-up provisions exist. Leakage compounds silently over years and may not be visible in a quick lease abstract.

   
   

Final Word

CAM leakage is frustrating precisely because it's so preventable. Yet, in the rush to lease up, many landlords concede language that quietly erodes NOI year after year. Once a lease is signed without a catch-up provision, leakage isn’t just likely—it’s guaranteed.