A CAM audit is a formal review of a landlord's CAM reconciliation statement to verify that charges are accurate, properly calculated, and consistent with the lease. The audit compares the statement line items against the lease's expense definition, pro-rata share formula, gross-up provision, and any caps.

How long does a CAM audit take?

With CAMAudit, a full forensic audit runs in under 15 minutes. Traditional CPA-led audits take 4 to 8 weeks and require scheduling, document collection, and manual review. The speed advantage of CAMAudit comes from automating the extraction and detection steps.

What documents do I need for a CAM audit?

You need your commercial lease (including all addenda and exhibits) and your CAM reconciliation statement from your landlord. The reconciliation is usually sent annually, within 90 to 120 days after the close of the lease year. If you haven't received it yet, request it in writing.

What does a CAM audit actually check?

CAMAudit checks 14 categories: management fee overcharge, pro-rata share error, gross-up violation, CAM cap violation, base year error, controllable expense cap overcharge, estimated payment true-up error, gross lease charges, excluded service charges, insurance overcharge, tax overallocation, utility overcharge, common area misclassification, and landlord overhead pass-through.

Do I need an attorney to dispute CAM charges?

Not necessarily. CAMAudit generates a dispute letter draft grounded in your specific findings and lease language. Many tenants resolve CAM disputes by sending this letter directly to their landlord or property manager. For large disputes or adversarial landlords, involving an attorney is advisable.

Average CAM Costs Per Square Foot by Property Type (2026 Benchmarks)

CAM charges range from $0.15/SF for bulk warehouse space to $24/SF for on-campus medical office buildings. The 2026 national averages: industrial $0.50-$2.10/SF, retail $4.50-$10.80/SF, office $7-$14.50/SF, medical $15-$20/SF. If your reconciliation exceeds the top of the range for your property type, investigate the line items. If it falls within range, that alone does not rule out overcharges, because lease-specific errors like management fee cap violations and pro-rata denominator manipulation produce bills that look normal in aggregate while containing $2-$3/SF in excess charges.

This guide aggregates benchmark data from BOMA, ICSC, CBRE, and JLL publications to provide 2026 reference ranges for each major commercial property category. These numbers should function as a calibration tool, not a ceiling. Your actual costs will depend on building age, location, lease vintage, and operating standards. But if your reconciliation comes in significantly above the range for your property type, that's a flag worth investigating. More on that below.

CAM Cost Benchmark: A per-square-foot reference range for common area maintenance charges by commercial property type, compiled from industry databases such as BOMA's Office Experience Exchange Report and ICSC's shopping center research. Benchmarks identify anomalies in total CAM spend but do not detect lease-specific overcharges, which require a forensic audit of individual line items against the lease's pass-through provisions.

2026 CAM Benchmarks by Property Type

Here's what the data shows: IREM's Journal of Property Management reports that 30% of CAM statements contain errors. That rate is distributed across the benchmark range, which means a below-benchmark bill can still contain overcharges just as easily as an above-benchmark one.

Property Type	CAM Range ($/SF/year)	National Avg (est.)	Primary Source
Bulk distribution / logistics	$0.15 – $0.75	$0.50	CBRE Industrial Report (2024)
Light industrial / flex	$1.50 – $3.00	$2.10	CBRE Industrial Report (2024)
Multi-tenant industrial park	$1.00 – $2.50	$1.80	JLL Industrial Outlook (2024)
Community/neighborhood retail	$3.00 – $6.00	$4.50	ICSC Research (2024)
Strip mall / power center	$4.00 – $8.00	$5.80	BOMA Experience Exchange (2023)
Restaurant / food service	$8.00 – $15.00	$9.40	ICSC Research (2024)
Fitness / gym	$6.00 – $12.00	$8.50	BOMA OER / market observation (2023–2024)
Class B suburban office	$5.00 – $9.00	$7.00	BOMA OER (2023)
Class A suburban office	$7.00 – $11.00	$9.00	BOMA OER (2023)
Class A CBD / urban office	$12.00 – $18.00	$14.50	BOMA OER (2023)
Regional mall (in-line)	$8.00 – $14.00	$10.80	JLL Retail Research (2024)
Medical office (off-campus)	$12.00 – $18.00	$15.00	CBRE Healthcare RE (2024)
Medical office (on-campus)	$17.00 – $24.00	$20.00	CBRE Healthcare RE (2024)

These ranges represent reported operating expenses from industry surveys. Your specific lease may have additional non-recurring items, capital assessment amortization, reserve contributions, one-time environmental compliance costs, that push costs above the range in any given year.

What Drives CAM Higher in Some Property Types?

Medical Office: The Infrastructure Premium

Medical office buildings carry CAM 2–3x higher than comparable office buildings for several legitimate reasons: HEPA or MERV-13+ HVAC filtration, backup power infrastructure, medical gas system maintenance, and enhanced janitorial standards. When on-campus hospital MOBs reach $20+/SF, a significant portion reflects genuine infrastructure cost sharing with the host hospital.

The overcharge risk in MOBs is different from other property types: costs specific to one tenant's specialty (biohazard handling, specialized HVAC for imaging equipment) sometimes enter the shared pool. See Medical Office CAM Charges for the detailed breakdown.

Regional Mall: High Pool, Anchor Exclusion Distortion

Regional mall in-line tenants pay $8–$14/SF because the total CAM pool is large, extensive common areas, parking structures, security, and event programming. But anchor tenants covering 40–60% of gross leasable area often contribute nothing to the pool, inflating each in-line tenant's effective share.

A mall where the anchor exclusion inflates each tenant's denominator by 50% effectively doubles the per-SF CAM impact for in-line tenants compared to what the benchmark range suggests. The $10/SF national average for in-line retail can represent the tenant's actual cost after anchor exclusion; the "real" cost if anchors paid their share might be $6–$7/SF.

Restaurant: Location Premium Plus Operational Cost

Restaurant tenants in strip centers pay higher CAM than other retail tenants in the same property because restaurant operations are typically associated with higher outdoor maintenance costs: grease trap cleaning, dumpster enclosure maintenance, enhanced pest control, and parking lot wear from food delivery traffic. Some landlords attempt to allocate these restaurant-specific costs to the shared pool rather than to individual restaurant tenants, which is the overcharge pattern documented in restaurant-specific CAM disputes.

Industrial: Scale Masks the Exposure

Industrial CAM rates are the lowest in commercial real estate, but the large footprints of distribution and logistics tenants mean absolute dollar exposure is significant. A 50,000 SF tenant paying $1.50/SF owes $75,000 annually. A 3% pro-rata error (common when landlords substitute GLOA for GLA in vacancy calculations) costs $2,250/year. Over a 6-year lookback, that's $13,500. For a detailed breakdown of what drives costs at industrial properties and where overcharges concentrate, see the industrial and warehouse CAM costs guide.

How to Use These Benchmarks

The benchmarks identify anomalies, not overcharges. If your reconciliation comes in at $18/SF for a Class B suburban office building (national average: $7/SF), you should investigate, but the benchmark alone doesn't tell you which specific line items are wrong.

Step 1: Compare your total CAM per SF against the range for your property type and market.

Step 2: If above the range, break the reconciliation into categories: maintenance, utilities, management, insurance, taxes, and reserves. Identify which category is above-market.

Step 3: Pull three years of reconciliations to assess whether costs are growing above the rate of inflation or above any applicable CAM cap.

Step 4: Cross-reference each above-market category against your lease's exclusion list and pass-through definitions.

Step 5: If you identify a specific discrepancy, run a formal audit.

Run a free audit on your CAM charges, the automated analysis compares your specific lease provisions against every line item in your reconciliation.

What the Benchmarks Can't Tell You

Industry averages mask significant within-category variation. A Class A office tower in Chicago with $16/SF CAM may be billing legitimately; a Class B building in Phoenix with $13/SF may be overcharging. Location, building age, lease vintage, and operating standards all affect legitimate costs.

More importantly, benchmarks don't catch lease-specific overcharges. The most common overcharges, pro-rata share errors, management fee cap violations, base year gross-up failures, all produce bills that look normal in aggregate. A $9/SF retail CAM bill can contain $2/SF in overcharges that the benchmark comparison doesn't reveal.

IREM's Journal of Property Management reports that 30% of CAM statements contain errors. That error rate is distributed across the benchmark range, there's no evidence that above-benchmark properties have higher error rates than below-benchmark ones. The errors are lease-specific, not benchmark-detectable.

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 weight the CAM component carries in 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. The benchmark table above also helps illustrate why industrial tenants should pay close attention when their CAM rate approaches $2.00/SF or above, as that is the range where billing errors become more common.

So what does this mean for tenants whose reconciliation totals fall within the benchmark range? It means the benchmark alone is not enough. A forensic review of individual line items remains necessary even when the total looks normal, because lease-specific overcharges like management fee cap violations and pro-rata denominator errors produce bills that appear market-rate in aggregate.

"Benchmarks tell you whether to look closer. They do not tell you what is wrong. A Class A office tenant at $9/SF CAM looks normal in the data. But that $9/SF can hide a $2/SF management fee cap violation that repeats silently every year. The benchmark passes; the audit catches it." — Angel Campa, Founder of CAMAudit

CAM Cost Benchmarks: Common Questions

How are CAM benchmarks calculated?

Industry benchmarks like BOMA's OER and ICSC's research data compile self-reported operating expense data from property owners and managers. They represent averages of actual billing data across hundreds or thousands of properties. They don't reflect what tenants should pay under their specific leases, only what tenants are actually paying on average.

My CAM is below the benchmark range. Does that mean I'm not being overcharged?

Not necessarily. Below-benchmark CAM can still contain overcharges if the total amount is lower than it should be but specific line items are incorrectly calculated. A management fee above your lease cap is an overcharge even if total CAM is low. A pro-rata denominator error is an overcharge even if the resulting bill is below average.

How much do CAM benchmarks vary by geographic market?

Substantially. Major CBD markets (New York, San Francisco, Chicago, Boston) run $2–$4/SF above national averages for the same property class. Sun Belt suburban markets often run $1–$2/SF below. The BOMA OER breaks data down by market and class, which is the most accurate comparison for a specific property.

Should I include utilities in my CAM comparison?

If your lease includes utilities in CAM (some do, some don't), include them in the comparison. If your lease bills utilities separately from CAM, compare only the non-utility CAM portion against benchmarks that exclude utilities. Mixing utility and non-utility data can make a below-market building look above-market or vice versa.

Related Resources

Sources

CAMAudit is a document analysis and automation tool. The analysis described on this page does not constitute legal advice. Consult a licensed attorney before sending any legal correspondence to your landlord.

Frequently Asked Questions

What is a typical CAM cost per square foot for retail space?

Community and neighborhood retail typically runs $3 to $6 per square foot annually. Strip malls and power centers run $4 to $8 per square foot. Restaurant and food service tenants pay $8 to $15 per square foot due to higher outdoor maintenance, pest control, and parking lot wear. Regional mall in-line tenants pay $8 to $14 per square foot because of large shared common areas and anchor exclusion effects.

What are typical CAM charges for office space?

Class B suburban office runs $5 to $9 per square foot annually. Class A suburban office runs $7 to $11 per square foot. Class A CBD urban office in major markets like New York, Chicago, or San Francisco runs $12 to $18 per square foot. Medical office buildings carry the highest CAM rates, $12 to $24 per square foot, due to HEPA filtration, backup power, and enhanced janitorial standards.

Why are CAM charges so much higher for medical office buildings?

Medical office buildings carry CAM 2 to 3 times higher than comparable office buildings due to HEPA or MERV-13+ HVAC filtration requirements, backup power infrastructure, medical gas system maintenance, and enhanced janitorial standards. On-campus hospital MOBs reaching $20 per square foot or more reflect genuine infrastructure cost sharing with the host hospital.

My CAM is within the benchmark range but I think I'm being overcharged. Is that possible?

Yes. Benchmarks identify anomalies, not individual lease violations. The most common overcharges, pro-rata share errors, management fee cap violations, base year gross-up failures, all produce bills that look normal in aggregate. A $9 per square foot retail CAM bill can contain $2 per square foot in overcharges that the benchmark comparison alone does not reveal.

What are typical CAM costs for industrial and warehouse space?

Bulk distribution and logistics space runs $0.15 to $0.75 per square foot annually. Light industrial and flex runs $1.50 to $3.00 per square foot. Multi-tenant industrial parks run $1.00 to $2.50 per square foot. Although rates are low, the large footprints typical in industrial leases mean absolute dollar exposure is significant, a 50,000 SF tenant at $1.50 per square foot owes $75,000 annually.