CAM vs NNN Charges: What’s the Difference — and Why It Matters

What CAM (Common Area Maintenance) Charges Are

CAM charges cover shared property expenses like landscaping, snow removal, lighting, parking lots, and general upkeep of common areas. These fees are typically billed monthly and reconciled annually.

While CAM sounds straightforward, disputes often arise over what gets included, how increases are calculated, and whether capital improvements or management fees are improperly passed through.

These issues often surface during annual CAM reconciliation reviews, where tenants compare estimated versus actual expenses and identify lease violations.

Real Tenant CAM Examples We See Often

Many tenants only realize something is wrong when CAM charges jump unexpectedly. One retail tenant saw CAM increase more than 18% year over year, despite no noticeable change in services or maintenance. Another discovered they were paying an administrative fee equal to nearly 15% of total CAM — something their lease limited but was never enforced.

These situations are common because CAM reconciliations are often dense, delayed, and difficult to verify. By the time tenants review them, they feel pressured to pay first and question later.

What NNN (Triple Net) Charges Include

NNN charges typically include three major expense categories:

• Property taxes
• Property insurance
• CAM charges

In a true NNN lease, tenants are responsible for their proportionate share of all three. However, many leases labeled “NNN” still contain carve-outs, caps, or exclusions that landlords may ignore.

Common NNN Surprises Tenants Report

Tenants are often surprised by how broadly NNN expenses are applied. Property tax reassessments can cause sudden spikes, insurance premiums may increase due to unrelated claims, and some landlords pass through costs that primarily benefit ownership rather than tenants.

The confusion is amplified when CAM is already embedded inside NNN, making it difficult to tell whether an increase is driven by taxes, insurance, or maintenance — or whether costs are being counted twice.

CAM vs NNN: The Key Differences

When CAM or NNN Charges Cross the Line

Not every increase is improper — but problems arise when charges violate the lease terms. This includes passing through capital improvements that should be amortized, exceeding CAM caps, charging for landlord overhead, or allocating expenses unrelated to the property.

If charges feel unclear, inconsistent, or significantly higher than prior years, that’s often a signal to review the lease language closely and verify whether the expenses are allowed.

For a structured framework on how to review these categories step-by-step, use our Tenant-First CAM Audit Checklist, which outlines the most common classification, allocation, and reconciliation risks.