CAM charges (common area maintenance charges) are costs billed to tenants under a triple net lease to cover the upkeep of shared property areas — landscaping, parking lot repair, exterior lighting, security, snow removal, and property management fees. In a single-tenant building, CAM effectively covers the tenant's own property upkeep; in multi-tenant industrial parks, it's prorated by square footage across all tenants.
What's typically included in CAM
CAM charges cover the shared infrastructure and services that keep an industrial property functional and presentable — things a tenant benefits from but doesn't manage directly. This typically includes parking lot and driveway maintenance, landscaping, exterior lighting and signage, common area utilities, trash removal, and a property management fee (often 3–5% of total CAM as an administrative charge).
What's excluded matters just as much as what's included. Capital expenditures — a new roof, major structural repairs — are typically handled separately, either absorbed by the landlord or amortized into CAM over many years depending on the lease language.
CAM reconciliation: how it works
Most leases bill CAM as an estimated monthly amount based on projected annual costs. At year-end, the landlord reconciles actual expenses against what was collected — tenants either owe a true-up payment for a shortfall or receive credit for an overpayment. Reviewing this reconciliation statement each year, and retaining audit rights to challenge it, protects tenants from being overcharged for costs outside their negotiated scope.
What to watch for before committing
Audit rights
Negotiate the right to review the landlord's actual CAM expense records annually, with a defined window to dispute discrepancies.
Annual increase caps
Ask for a cap (commonly 3–5%) on how much controllable CAM costs can rise year over year.
Capital expenditure exclusions
Confirm major capital repairs — roof replacement, parking lot resurfacing — are excluded or amortized rather than billed in full in a single year.
Management fee calculation
Confirm whether the property management fee is a flat percentage of CAM or of total rent — the latter is a much larger number.
Gross-up provisions
In partially vacant multi-tenant buildings, confirm how the landlord calculates your CAM share so vacancy doesn't inflate your cost.
Line-item transparency
Request an itemized CAM budget before signing, not just a lump-sum estimate, so you can evaluate whether the charges are reasonable for the market.
When you need to know this
- Budgeting true occupancy cost — estimating full annual cost beyond quoted base rent
- Multi-tenant industrial parks — understanding how shared costs are prorated across tenants
- Lease renewal negotiations — reviewing CAM history to negotiate caps or exclusions going forward
- Comparing competing buildings — normalizing all-in cost across properties with different CAM structures
Frequently asked questions
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