CAM costs by property type: retail, office, industrial, and medical benchmarks

A medical office tenant paying $18/SF in CAM carries more than 100 times the annual CAM burden of an industrial tenant at $0.15/SF. The spread across property types is that wide — and it determines how much a billing error costs you.

CAM charges aren't uniform. They reflect the actual operating complexity of the building: how many shared systems there are, how often they need maintenance, and how much labor it takes to keep common areas functional. A retail strip mall with a parking lot, landscaping, and shared HVAC has different costs than a warehouse with a shared perimeter light. A medical building with biohazard waste disposal and hospital-grade air filtration has different costs than both.

The benchmarks below come from 2024–2026 data compiled by HelloData.ai, LeaseRef, and specialized healthcare real estate advisors, cross-referenced with BOMA International's expense recovery guidelines. They're the reference point auditors use to flag whether a specific CAM bill is plausible — or worth questioning.

Annual CAM cost benchmarks by property type

The retail range is wide because it covers everything from neighborhood strip malls (lower end) to lifestyle centers and regional malls (upper end). High-end retail assets tend toward $8–$12/SF due to daily exterior cleaning, frequent resurfacing, intensive landscaping, and security staffing. Standard retail sits in the $3–$6 range.

Office buildings carry more CAM than retail on average because shared interior systems dominate: daily janitorial for common lobbies and restrooms, continuous elevator maintenance, shared HVAC electricity costs, and dedicated on-site property staff. A Class A building in a major market will hit $15/SF or above.

Industrial is the lowest category. Warehouses and distribution centers use almost no shared amenities. CAM is typically basic: seasonal landscaping, shared driveway maintenance, exterior lighting. Industrial tenants paying above $3/SF in CAM warrant a close look at what's being charged.

Medical office is in a category of its own. Regulatory compliance, biohazard waste disposal, enhanced HVAC air filtration, and hospital-grade cleaning protocols push costs well above standard office. A medical tenant at $18/SF in CAM is paying more than 100 times the CAM rate of a typical industrial tenant — and any billing error at that rate scale compounds fast.

Overcharge exposure at 17.5% recovery rate

When commercial tenants engage professional auditors, they recover an average of 15–20% of total billed CAM charges (industry aggregate, major audit providers). Using a conservative 17.5% median against the benchmarks above:

The 3-year lookback column shows why property type matters so much for recovery math. A Class A office tenant at 10,000 SF has $78,750 in potential 3-year recoveries — more than enough to justify a formal audit at any price point. An industrial tenant at the same square footage has $10,500 available over 3 years.

Most leases and state statutes permit a 24- to 36-month lookback period for disputed charges. That's the window before errors become too old to claim.

What drives costs higher at the top end of each range

Retail

Parking lot resurfacing is the big variable. Major resurfacing projects run $30,000–$150,000 at the building level. Whether those costs are capital expenditures (should be amortized over the parking lot's useful life) or operating expenses (fully chargeable in the year incurred) is one of the most frequently litigated questions in retail CAM audits. Landscaping costs also vary widely by property geography and aesthetic standards — a strip mall in Phoenix has different water and maintenance costs than one in Seattle.

Office

The elevator maintenance contract alone can run $50,000–$120,000 annually for a multi-story building, split across tenants. HVAC shared systems are another major line item, particularly in older buildings with less efficient equipment. Janitorial contracts for common areas — lobbies, hallways, restrooms — add $3–$5/SF in high-traffic Class A buildings.

Industrial

Industrial CAM is usually the most straightforward, which makes errors easier to spot. When an industrial tenant sees $2.50/SF in CAM and the benchmark is $0.50–$1.50/SF for comparable properties, the excess usually traces to a specific line item: shared office space costs being allocated to the warehouse tenant, or landscaping for a front-of-building area the tenant doesn't use.

Medical office

Medical buildings often have a landlord-managed hazardous waste disposal program that runs $20,000–$60,000 annually. HVAC filtration systems with HEPA or MERV-16 requirements cost substantially more to maintain than standard office systems. Tenants in medical buildings should pay close attention to whether these costs are being allocated appropriately per the lease — and whether the building is actually running a compliant program or just billing for one.

Using benchmarks to spot billing problems

The benchmarks serve two purposes in a CAM audit.

First, they flag outliers. If a retail tenant in a strip mall is being billed $13/SF in CAM when the benchmark for high-end retail tops out at $12/SF, that warrants a line-item review. The excess may be legitimate (unusual building systems, high-cost market), but it could also reflect capital expenditures improperly expensed, management fees above the lease cap, or phantom charges.

Second, they inform the base year. In modified gross leases with expense stops, the base year should reflect actual normalized costs. If a landlord sets a base year during a period of unusually low operating costs, every subsequent year shows an apparent increase that isn't real. Comparing the base year to property-type benchmarks reveals whether the base was set artificially low.

The National Lease Advisors found that misallocated expenses can inflate a standard in-line tenant's CAM charges by up to 18%. At a $10/SF starting point, that's $1.80/SF in recoverable overcharges per year — $18,000 annually for a 10,000 SF tenant.

CAM as a percentage of total occupancy cost

BOMA International data shows CAM represents 15–35% of a commercial tenant's total occupancy cost, depending on property type and market. That range affects how much leverage the CAM component has over total rent burden.

For a retail tenant paying $20/SF base rent and $8/SF CAM, CAM is 29% of total occupancy cost. A 17.5% overcharge in CAM translates to a 5% overcharge on total occupancy — real money on a multi-year lease.

For an industrial tenant paying $6/SF base rent and $1/SF CAM, CAM is 14% of total cost. The absolute dollar impact of a 17.5% overcharge is lower, but it's still $1,750/year on 10,000 SF.

Frequently Asked Questions

What are typical CAM charges per square foot for retail properties?

Retail CAM ranges from $3 to $10/SF annually, with high-end lifestyle centers and regional malls running $8–$12/SF. The spread reflects the intensity of shared amenities: parking lot maintenance, landscaping, exterior cleaning, and security. Strip malls in lower-cost markets tend toward $3–$5/SF. Major market retail with intensive common areas trends toward $7–$12/SF.

Why is medical office CAM so much higher than regular office?

Medical buildings operate under regulatory requirements that don't apply to standard commercial properties. Biohazard waste disposal, HEPA or MERV-16 air filtration systems, hospital-grade cleaning protocols, and enhanced security requirements all add operating costs that pass through to tenants. CAM in medical buildings routinely runs $15–$20+/SF versus $8–$15/SF for standard office — a difference of $50,000–$70,000 annually for a 10,000 SF tenant.

How do I know if my CAM charges are too high for my property type?

Compare your current CAM rate (total CAM billed divided by your leased square footage) against the benchmark range for your property type. If you're significantly above the upper end of the range, request an itemized expense ledger from your landlord. The excess may be legitimate (unique building systems, high-cost market), but it's worth verifying that capital expenditures are properly amortized, management fees are within lease caps, and no excluded expenses are showing up in the pool.

Do CAM charges change significantly year over year?

They can. Controllable expenses (management fees, janitorial, landscaping) typically increase 3–5% annually in stable markets. Uncontrollable expenses (property taxes, insurance) can jump sharply after assessments or insurance market changes. The 2024–2026 insurance market hardening pushed many property insurance premiums 30–50% above 2017 BOMA benchmark figures, which has driven real CAM increases in several markets. Many leases cap annual increases in controllable expenses at 3–5%; those caps don't apply to taxes and insurance.

What's the minimum CAM bill that makes a formal audit worthwhile?

The math depends on your recovery rate and audit cost. At a 17.5% recovery rate on a $30,000 annual CAM bill, you'd expect $5,250 in annual recoveries — $15,750 over a 3-year lookback. Traditional audit firms charge $2,500–$15,000 plus 33% contingency, so the break-even on a traditional audit requires roughly $100,000+ in annual CAM. AI-powered audits (CamAudit: $199) make the math work for any annual CAM bill above $1,140.

See the NNN Lease Tenant Guide for the full context on how CAM charges are structured. For data on overall overcharge rates across property types, see CAM Overcharge Statistics. Ready to check your reconciliation? Run a free CAM scan.