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.

Case Study: $62,000 in Pro-Rata Errors Across 8 Franchise Locations

A QSR franchise operator running 8 locations across four states uploaded every lease and reconciliation statement to CAMAudit in a single afternoon. The scan flagged pro-rata share denominator errors at 5 of the 8 locations. Combined overcharge: $62,100. The errors weren't random — they followed a pattern tied to how one property management company calculated occupied area.

The Scenario

The operator ran quick-service restaurants ranging from 2,000 to 2,800 square feet, spread across strip centers and power centers in Texas, Florida, Georgia, and Tennessee. Each location had its own lease, its own landlord entity, and in several cases, its own property management company — though two of the five flagged locations shared the same management firm.

Annual CAM charges across the portfolio averaged $28,000 per location, putting total annual CAM spend in the neighborhood of $224,000.

Nothing looked obviously wrong at any individual location. The errors only became visible when all eight leases were analyzed against the same detection rules simultaneously.

What Triggered the Audit

The operator's CFO had a recurring suspicion that the portfolio was being overbilled but couldn't pinpoint where. Each location's reconciliation looked reasonable in isolation. The CFO ran all eight through CAMAudit to get a cross-portfolio view.

What CAMAudit Found

Rule 4 (Pro-Rata Share Error) flagged denominator inconsistencies at 5 of the 8 locations. The specific error: landlords were calculating the tenant's pro-rata share using only the occupied area of the building as the denominator, rather than the total leasable area.

This matters because the denominator controls what percentage of total CAM costs the tenant pays. A smaller denominator — occupied area instead of total leasable area — inflates the percentage.

Example: a tenant occupying 2,400 sq ft in an 80,000 sq ft building has a 3.0% pro-rata share if the denominator is total leasable area. If 20% of the building is vacant and the denominator shrinks to 64,000 sq ft, the same tenant's share becomes 3.75% — a 25% increase in their CAM obligation, driven entirely by landlord-side vacancy.

Every affected lease specified that pro-rata share should be calculated on total leasable area. The landlords' reconciliation statements used occupied area. The leases and the billings disagreed, and no tenant had caught it.

"Franchise operators are particularly exposed to this error because they're often dealing with multiple landlords and multiple property management companies simultaneously. No single location looks dramatic enough to trigger a formal dispute. But when our detection engine runs the same 14 rules across the full portfolio, the pattern surfaces immediately. Five of eight locations with the same denominator error is not a coincidence — it's a systematic billing practice." — Angel Campa, Founder of CAMAudit

40% of CAM reconciliations contain material errors (Tango Analytics/PredictAP, 2023)

The Math

The denominator error averaged 8.3% across the five affected locations (range: 5% to 14%). Applied to an average annual CAM of $28,000:

Average annual overcharge per affected location: $28,000 × 8.3% = $2,324/year
Lookback range: 2–4 years depending on each lease's audit rights window
Total overcharge across 5 locations over lookback periods: $62,100

Location-level breakdown:

Location A (TX): 14% denominator error, 4-year lookback → $15,680
Location B (FL): 9% denominator error, 3-year lookback → $7,560
Location C (GA): 8% denominator error, 4-year lookback → $8,960
Location D (TN): 6% denominator error, 2-year lookback → $3,360
Location E (TX): 5% denominator error, 4-year lookback → $5,600

The two Texas locations shared a property management company. Their denominator methodology was identical — confirming this was a systematic billing practice, not a clerical error.

The Resolution

CAMAudit generated a standardized analysis for each affected location, showing the lease-specified denominator, the denominator actually used, and the resulting overcharge by year. The operator's team used the dispute letter template from CAMAudit as the base for each location's correspondence, customizing the specific numbers.

Four of the five landlords settled within 60 days:

Three issued credits against future rent
One processed a direct refund check

The fifth landlord — the property management company handling both Texas locations — disputed the calculation methodology and required the operator to formally invoke the audit rights clause and request supporting documentation. After reviewing the actual reconciliation worksheets (which confirmed the occupied-area denominator), that landlord settled for the combined Texas amount ($15,680 + $5,600 = $21,280) six weeks later.

Total recovered: $62,100 across all five locations.

The three locations with no errors received a clean confirmation — useful for the CFO's peace of mind and for establishing a baseline for future reconciliations.

Key Takeaway

Pro-rata share errors are the most common denominator error in multi-tenant commercial properties, and they're systematically underdetected because they require comparing the lease definition to the reconciliation calculation — something most tenants never do.

For franchise operators and multi-location tenants, the leverage multiplier works in your favor: auditing all locations at once surfaces patterns that no individual location review would catch, and the combined overcharge creates more meaningful settlement leverage than a single $2,300 dispute.

Watch for this error if:

Your building has had significant vacancy in any reconciliation year
Your pro-rata share percentage has drifted upward without a corresponding explanation
Multiple locations share the same property management company

State SOL windows vary: Texas is 4 years, Florida is 5 years, Georgia and Tennessee are 6 years. The applicable lookback at each location was bounded by the shorter of the state SOL and the lease's audit rights window.

For a detailed walkthrough of how to identify and calculate pro-rata denominator errors, see how to calculate a multi-year CAM overcharge.

FAQ

What is the correct denominator for pro-rata share calculations?

Most commercial leases specify that pro-rata share is calculated by dividing the tenant's leased square footage by the total leasable area (GLA) of the building or shopping center. Some leases explicitly include or exclude anchor tenant space, parking structures, or outparcels. The key is what your specific lease says — that definition overrides whatever methodology the property management company uses in their reconciliation software.

Why would a landlord use occupied area instead of total leasable area?

Some landlords argue that using total leasable area is unfair to tenants — after all, if a third of the building is vacant, the occupied tenants are bearing 100% of the costs, and the landlord is effectively subsidizing the vacancy gap. That argument has some logic. But it's irrelevant if your lease specifies total leasable area. The lease controls. If your landlord wants to use occupied area, they need a lease clause that says so.

Can I dispute pro-rata errors across multiple lease years at once?

Yes. A single dispute letter can cover multiple reconciliation periods within your lookback window. Your lease's audit rights clause typically specifies how many years you can look back (commonly 12–24 months from each reconciliation statement date). State contract law SOLs provide a ceiling but your lease window is usually the binding constraint. Document each year's overcharge separately in your dispute to make the calculation transparent and defensible.

Case Study: $62,000 in Pro-Rata Errors Across 8 Franchise Locations