Many Chicago commercial tenants focus on base rent and overlook the most volatile component of their occupancy cost: CAM charges and NNN structures.
For healthcare and service businesses, misunderstanding CAM structures can materially affect profitability, lease flexibility, and long-term expansion strategy.
This guide breaks down:
- What CAM actually includes
- How NNN leases function in Illinois
- How landlords calculate and reconcile expenses
- Where tenants overpay
- How to negotiate protections in your LOI
What Is CAM in a Commercial Lease?
CAM stands for Common Area Maintenance.
It refers to shared operating expenses required to maintain a commercial property.
However, in modern Chicago commercial leases, CAM is often part of a broader Triple Net (NNN) structure.
Core Components Typically Included in CAM:
- Snow removal (critical in Chicago)
- Landscaping
- Parking lot maintenance
- Security
- Elevator maintenance
- HVAC maintenance (common systems)
- Property management fees
- Insurance (sometimes separate)
- Real estate taxes (often separate category but bundled in NNN)
What Is a Triple Net (NNN) Lease?
A Triple Net lease requires the tenant to pay:
- Base Rent
- Property Taxes
- Insurance
- CAM / Operating Expenses
In Chicago suburban retail and office markets, NNN structures are common, particularly in:
- Schaumburg retail corridors
- Naperville strip centers
- Northbrook medical office
- Downers Grove mixed-use developments
Gross vs Modified Gross vs NNN: Chicago Context
Below is a structural comparison relevant to Illinois commercial leases:
Real Chicago Cost Example (2025 Suburban Medical Office)
Assume:
- 3,000 SF medical office in Naperville
- Base rent: $32 PSF
- NNN: $14 PSF
Annual Cost Breakdown:
That $42,000 in NNN expenses is where tenants often lose control.
What Is Included in Chicago CAM Charges?
Not all CAM structures are equal.
Typical breakdown in suburban Chicago:
- Real Estate Taxes: $5–$9 PSF
- Insurance: $1–$2 PSF
- Maintenance & Utilities: $3–$6 PSF
- Management Fee: 3%–5% of gross rent
- Capital Reserve (sometimes embedded)
The Hidden Risks Tenants Overlook
1. No CAM Cap
Many leases do not include a cap on annual CAM increases.
In volatile tax environments (Cook County reassessments), increases can exceed 10–15% annually.
2. Capital Expenditures Disguised as CAM
Some landlords attempt to pass through:
- Roof replacement
- Structural repairs
- Parking lot resurfacing
These should often be excluded or amortized.
3. Management Fees Markup
Management fees may include overhead allocation not directly tied to property operations.
CAM Reconciliation: Where Disputes Happen
Each year, landlords reconcile estimated CAM vs actual expenses.
If actual expenses exceed estimates, tenants receive a bill.
If lower, tenants receive a credit.
Tenants often fail to:
- Audit reconciliations
- Request documentation
- Challenge improper expense allocation
In Illinois, commercial tenants typically have limited statutory protections. Lease language governs everything.
Negotiation Strategies for Chicago Tenants
1. Negotiate a CAM Cap
Common structure:
- 4%–5% annual cap on controllable expenses
- Exclude taxes and insurance from cap
2. Define “Controllable Expenses”
Exclude:
- Capital improvements
- Structural repairs
- Landlord debt service
- Leasing commissions
3. Demand Audit Rights
Include:
- 60–90 day audit window
- Right to third-party review
- Reimbursement if variance > 5%
2024–2026 Chicago Market Trend Impact
Due to elevated office vacancy (22–25% downtown):
Landlords are:
- Offering higher TI allowances
- Providing free rent
- More flexible on CAM caps
However:
Retail and industrial landlords remain less flexible.
CAM Ranges by Chicago Submarket (2026)
Why Healthcare and Service Tenants Are Most Exposed
Healthcare tenants often:
- Have heavy build-out costs
- Sign 7–10 year leases
- Have limited mobility
Small increases in CAM compound over time.
Example:
$3 PSF unexpected increase
3,000 SF practice
= $9,000 annually
= $90,000 over 10 years
Key Takeaways
- Base rent is only part of occupancy cost
- NNN structures shift risk to tenants
- CAM caps are critical
- Audit rights matter
- Chicago tax volatility affects projections
- Submarket selection impacts long-term expense profile
Final Thought
In Chicago’s 2026 commercial real estate market, negotiation leverage exists—but only for tenants who understand the full cost structure.
CAM and NNN clauses are not administrative details.
They are financial risk mechanisms.
Before signing an LOI, ensure operating expense language is addressed—not just rent.
