A lease audit reviews your landlord's billing against your lease terms. Learn what it covers, how far back you can look, what it costs, and how to start.
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Find My OverchargesSee a sample report firstTL;DR: A lease audit is a systematic review of your landlord's CAM billing against your specific lease terms. It covers operating expenses, tax allocations, insurance, and management fees. Most tenants should audit annually when the reconciliation statement arrives, and look back 3 to 10 years depending on state law. Cost ranges from free (self-review) to $199 (AI-powered) to 33% contingency (traditional firm).
A lease audit is a systematic review of a commercial landlord's billing practices against the specific terms of the lease agreement. It examines whether operating expense charges, CAM reconciliations, tax allocations, insurance pass-throughs, and management fees were calculated correctly and in compliance with the lease. The goal is to identify and recover overcharges that a tenant paid, or is being asked to pay, that exceed what the lease permits.
Lease audits are distinct from financial statement audits. A financial statement audit verifies accounting records for investors or lenders. A lease audit verifies billing accuracy for the tenant.
A comprehensive lease audit covers five billing categories:
The audit verifies that:
The audit recalculates the tenant's percentage from the denominator definition in the lease. It checks for:
The audit verifies that:
The audit checks that:
In London Trocadero (2015) LLP v. Picturehouse Cinemas Limited [2025] EWHC 1247 (Ch), the court held that a landlord was not entitled to recover insurance rent representing commission rebated to itself. The court ordered repayment of the amounts unlawfully charged. (Source)
For modified gross and full-service leases with expense stops or base years, the audit verifies that:
The five situations that most commonly warrant a lease audit:
1. Annual CAM reconciliation statement arrives. The most common trigger. When the landlord delivers the year-end reconciliation showing a balance due, you have a limited window to dispute errors. Most leases require disputes within 30 to 180 days. The moment the statement arrives is the right time to initiate a review.
2. Your CAM bill increased more than 10% year over year. Property operating costs do increase over time, but a jump above 10% in a single year often signals a specific event: capital expenditure misclassification, management fee restructuring, or a change in how expenses are allocated. These warrant investigation before payment.
3. A major tenant vacated the building. When an anchor tenant or large occupant leaves, remaining tenants often absorb a higher pro-rata share of common area costs. The critical question is whether the denominator changed proportionally. If the anchor's square footage was excluded from the denominator but the costs serving their space remained in the pool, remaining tenants overpay.
4. You are approaching lease renewal. Overcharges identified before renewal can be used as negotiating leverage for better CAM terms in the next lease: broader exclusion lists, annual cap provisions, better management fee caps, and stronger audit rights language.
5. You have never audited before. If your business has occupied commercial space for 3 or more years on a NNN or modified gross lease and has never audited, probability strongly favors that some overcharges have accumulated. Most overcharges are systematic (wrong denominator, consistent gross-up misapplication) and repeat year after year until identified and corrected.
| Overcharge category | What triggers it | Typical dollar range |
|---|---|---|
| Management fee overcharge | Fee calculated on wrong base, fee-on-fee, undisclosed admin fees | $3,000 to $30,000/year |
| Pro-rata share error | Wrong denominator, outdated building SF, anchor exclusion error | $5,000 to $50,000/year |
| Capital expense misclassification | Improvement depreciated as single-year operating expense | $10,000 to $200,000/year |
| Gross-up misapplication | Gross-up applied to property taxes, insurance, fixed contracts | $2,000 to $25,000/year |
| CAM cap violation | Compounded math where lease requires cumulative | $3,000 to $40,000/year |
| Insurance overcharge | Commissions included in premium, wrong coverage types billed | $1,000 to $15,000/year |
| Tax overallocation | Taxes from non-property entities, reassessment errors | $2,000 to $30,000/year |
A lease audit requires:
The audit scope covers:
Review each expense category against the lease provision that governs it. Recalculate management fees, pro-rata shares, gross-up adjustments, and cap compliance from the lease formulas. For a complete breakdown of all 10 steps with document request templates and calculation examples, see the full lease audit procedures guide.
Under most leases' audit rights clauses, tenants can request:
Organize findings by category. For each finding, document the amount the landlord charged, the amount the lease permits, and the specific lease provision supporting the tenant's position.
A dispute letter draft citing specific lease provisions, the calculation methodology, and the dollar discrepancy is the opening position in the dispute process. Most overcharge disputes resolve at this stage through negotiation rather than litigation.
“I built CAMAudit because the manual process described above takes weeks and most tenants never start it. After running hundreds of reconciliations through the tool, the most common finding is not a complex exotic error. It's a management fee calculated on the wrong base, or a pro-rata denominator that quietly shifted when an anchor left. Both are simple to prove once you have the lease and the reconciliation in the same place.”
| Service type | Cost structure | Turnaround | Best for |
|---|---|---|---|
| Tenant self-review (spreadsheet) | Free | 2 to 4 hours | Tenants comfortable with lease analysis |
| AI-powered audit (CAMAudit) | $199 flat fee | Under 5 minutes | 1 to 25 locations, recovery under $50K |
| Traditional contingency firm | $250 + 33% of recovery | 2 to 4 weeks | 25+ locations, large recovery |
| CPA forensic audit | $300 to $500/hr (KPMG/Deloitte rates) | 4 to 8 weeks | Enterprise, potential litigation |
| BPO lease admin service | Monthly retainer | Ongoing | Portfolio-level systematic review |
The traditional contingency model creates an access problem: on a $15,000 recovery, a 33% firm keeps $4,950. A $199 flat-fee platform keeps $199. The remaining $14,801 stays with the tenant.
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Find My OverchargesMost commercial leases include an "audit rights" or "tenant audit" provision. This clause gives you the right to:
Key negotiated variables in audit rights clauses:
If your lease does not include an explicit audit rights provision, the implied right to verify charges may still exist under state contract law, but enforcing it is harder. Most sophisticated tenants negotiate a 12-month audit window and a 3-year lookback as standard provisions.
The lookback period for a lease audit is governed by two separate limits that work together. Both apply simultaneously, and the shorter of the two controls.
Limit 1: Your lease's audit rights provision. Most audit rights clauses specify how many prior years a tenant can request records for. Common windows are one to three years. A lease with a three-year lookback means the landlord is only obligated to produce records for the current year plus the two prior years, regardless of the state SOL.
Limit 2: The state statute of limitations for written contract claims. Even if your lease's audit rights clause is silent on lookback, state law caps your ability to sue for recovery. Overcharges outside the SOL window are not recoverable through litigation.
| SOL period | States | Implied audit years |
|---|---|---|
| 3 years | AK, CO, DE, DC, MD, MS, NH, SC | 3 prior years |
| 4 years | CA (CCP § 337), TX (§ 16.004) | 4 prior years |
| 5 years | AR, FL (§ 95.11), ID, KS, NE, OK, VA | 5 prior years |
| 6 years | AL, AZ, CT, HI, ME, MA, MI, MN, NV, NM, ND, NY (CPLR § 213), OR, SD, TN, UT, VT, WA, WI | 6 prior years |
| 8 years | MT | 8 prior years |
| 10 years | IL (735 ILCS 5/13-206), IN, IA, KY, LA, MO, RI, WV, WY | 10 prior years |
The discovery rule. Several states toll the SOL clock until the tenant discovers the overcharge rather than when it first occurred. Massachusetts, New Mexico, Alaska, and others apply the discovery rule to contract claims. A tenant who has never audited may argue the clock started with the first audit, not the first year of billing. This is a fact-specific legal question. Consult an attorney if your lookback window is material to your recovery potential.
Practical implication: A tenant in Illinois on a 10-year-old lease with consistent annual overcharges should audit all 10 prior years simultaneously. Each credit on the CAMAudit platform covers one lease year. The number of credits to purchase equals the number of years within your state's SOL window.
The terms are often used interchangeably, but there is a technical distinction.
CAM audit typically refers specifically to reviewing the common area maintenance reconciliation: the annual statement of operating expenses and the tenant's pro-rata share.
Lease audit is broader and encompasses all financial obligations under the lease, including CAM, real estate taxes, insurance, base rent escalations, operating expense stops, and any other cost pass-throughs defined in the lease.
For NNN leases, a lease audit and a CAM audit cover most of the same ground because CAM, taxes, and insurance are the three major variable costs. For modified gross leases, the base year and expense stop calculations are additional audit targets not always covered in a pure "CAM audit."
For more on the CAM-specific process, see what is a CAM audit and the CAM audit methodology guide.
Starting your audit:
Understanding specific charges:
Dispute: