2026-05-26

common area maintenance — what it means in a contract

What it means

Common area maintenance (CAM) refers to the costs associated with operating and maintaining the shared portions of a commercial property — lobbies, parking lots, hallways, landscaping, elevators, and similar spaces that all tenants use. In most commercial leases, particularly in retail and office settings, landlords pass these costs through to tenants rather than absorbing them entirely. Tenants pay a proportionate share based on how much of the building they occupy, calculated as a percentage of total rentable space.

CAM charges are typically billed on top of base rent and can include expenses like cleaning, snow removal, security, exterior lighting, property management fees, and repairs to shared systems. Leases vary significantly in what they include or exclude, and the specific definition of CAM is one of the most negotiated elements in commercial leasing.

Why it matters

CAM charges can meaningfully increase the total cost of a commercial lease — sometimes adding 20–50% on top of base rent. Because landlords often estimate CAM costs at the start of the year and reconcile at year-end, tenants may face unexpected "true-up" payments if actual expenses exceed estimates. Understanding and negotiating CAM provisions protects tenants from surprise costs and ensures landlords can only pass through legitimate expenses.

Key negotiation points include caps on annual CAM increases, exclusions for capital improvements or management fees, audit rights (the right to inspect the landlord's records), and limits on what qualifies as a recoverable expense.

Example

A tenant leases 2,000 square feet in a 20,000 square foot retail strip mall — meaning they occupy 10% of the building. If annual CAM costs total $80,000, the tenant's share is $8,000 per year, or roughly $667 per month on top of base rent. If the landlord's actual costs at year-end come in at $90,000, the tenant would owe an additional $1,000 in a reconciliation payment.

Common confusions

CAM vs. NNN (triple net): In a triple-net lease, tenants pay property taxes, insurance, and maintenance separately. CAM is specifically the maintenance/operating cost component — it may appear inside an NNN lease as one of the three charges, or it may exist independently in a gross-modified lease structure.

CAM vs. operating expenses: These terms are sometimes used interchangeably, but operating expenses can be broader, encompassing taxes and insurance in addition to maintenance costs. Always check the lease definition rather than assuming they mean the same thing.

Estimates vs. actuals: CAM is billed on estimates throughout the year, but what you actually owe is determined by the reconciliation. Tenants who don't review annual reconciliation statements often miss errors or improperly categorized expenses.

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