Definition
CAM stands for Common Area Maintenance. It refers to the operating costs required to maintain and run a property’s shared/common areas—such as parking lots, landscaping, exterior lighting, sidewalks, security, and similar items. In many commercial leases (especially NNN and modified gross leases), CAM is recovered from tenants as part of their operating expense reimbursements.
What CAM Typically Includes
CAM definitions vary by lease, but common items include:
- Landscaping: mowing, irrigation maintenance, seasonal plantings.
- Parking lot: sweeping, striping, pothole repairs, sealing, lighting.
- Snow/ice: plowing, de-icing, hauling (where applicable).
- Common-area utilities: exterior lighting electricity, water for landscaping, etc.
- Cleaning: sidewalks, common corridors/restrooms (property type dependent).
- Security: patrols, cameras, monitoring (if provided).
- Property management (sometimes): may be included or separately itemized, depending on lease language.
What CAM Usually Excludes
Exclusions are just as important as inclusions. Many leases exclude:
- Capital expenditures: major replacements (roof, structural) unless amortized and allowed.
- Tenant improvements & leasing costs: TI, commissions, tenant-specific buildouts.
- Owner financing costs: debt service, interest, principal payments.
- Depreciation: accounting depreciation is typically excluded.
- Marketing for leasing: sometimes excluded or capped.
- Costs caused by one tenant: may be charged directly to that tenant instead of CAM.
How CAM Charges Are Calculated
CAM is typically allocated to tenants based on their pro rata share of the rentable area. A tenant’s pro rata share is usually:
- Pro Rata Share = Tenant RSF ÷ Total RSF of the property (or leased RSF, depending on lease)
- Tenant CAM Payment = Pro Rata Share × Total CAM Expenses (for the period)
Estimates, Billings, and Reconciliations
CAM is commonly billed as monthly estimates based on a budget. At year-end, the landlord provides a reconciliation comparing estimated billings to actual expenses:
- If actual CAM is higher: the tenant pays a true-up.
- If actual CAM is lower: the tenant receives a credit (or refund, depending on lease).
Why CAM Matters
For owners, CAM impacts expense recovery, tenant satisfaction, and the quality of the rent roll. For tenants, CAM affects total occupancy cost, and unexpected CAM spikes can strain renewals or cause disputes.
Investor Uses
- Underwriting NNN income: separate base rent from reimbursements and model collections risk.
- Expense control: verify which costs are recoverable vs. owner responsibility.
- Lease review: identify caps, exclusions, and audit rights that affect recoverability.
- Stability assessment: high CAM volatility can signal deferred maintenance or poor vendor control.
Example
A retail center has 50,000 RSF. Tenant A leases 5,000 RSF (10% pro rata share). Annual CAM expenses total $200,000.
- Tenant Pro Rata Share = 5,000 ÷ 50,000 = 10%
- Tenant Annual CAM = 10% × $200,000 = $20,000
- Tenant Monthly CAM ≈ $20,000 ÷ 12 = $1,667/month
Common Pitfalls
- Ambiguous lease language: “CAM†can be defined broadly or narrowly—read the definition section carefully.
- Gross-up clauses: some leases “gross up†expenses to stabilized occupancy; misunderstanding can skew underwriting.
- CAM caps: tenants may have annual limits on controllable CAM increases (with carve-outs).
- Capital vs. expense fights: landlords may amortize capital items into CAM; tenants often contest what’s allowed.
- Audit rights: tenants may have the right to audit CAM; poor documentation creates disputes and write-downs.