Commercial Lease Audit Checklist

A lease audit is one of the most effective ways for commercial tenants to verify that they are being billed correctly under their lease agreement. Whether you operate a retail store, medical practice, franchise location, or office space, conducting a periodic audit of your CAM charges and operating expense pass-throughs can uncover billing errors that quietly accumulate over time.

This checklist provides a structured framework for reviewing your lease charges. You don't need a background in commercial real estate to follow it — each item is explained in plain language so that any business operator can use it.

Before You Start: Gather Your Documents

Before you begin the audit, collect the following documents. Having everything in one place will make the process significantly faster:

• Your executed lease agreement — including all amendments, addenda, and side letters.
• CAM reconciliation statements — for the current year and at least the prior two years. See our guide on CAM reconciliation for background on what these statements contain.
• Monthly rent and CAM invoices — to compare estimated charges against actual reconciliation amounts.
• Prior audit reports — if you have conducted audits in previous years.

Step 1: Verify Your Lease Terms

Start by confirming the fundamental terms of your lease that affect how charges are calculated:

• Lease type: Is your lease a triple net (NNN), modified gross, or full-service gross lease? This determines which expenses you are responsible for.
• Premises square footage: Confirm the rentable square footage stated in your lease matches what is used in the reconciliation calculations.
• Proportionate share: Verify the percentage used for your share of common area expenses. This is typically your square footage divided by total leasable area.
• Base year or expense stop: If applicable, confirm the base year amounts being used in your calculations.
• Lease commencement and expiration dates: Ensure charges are only billed for periods your lease is active.

Step 2: Review the CAM Reconciliation Statement

The annual CAM reconciliation statement is the core document you are auditing. Review it with the following questions in mind:

• Are all expense categories consistent with what your lease allows to be passed through?
• Are there any new line items that did not appear in prior years? If so, are they permitted under your lease?
• Do any individual expense categories show large year-over-year increases? Spikes may indicate common overcharges such as capital expenses being classified as operating costs.
• Is the management fee calculated at the correct percentage as specified in your lease?
• Does the statement reflect the correct proportionate share for your space?

Step 3: Check for Excluded Expenses

Most commercial leases include a list of expenses that the landlord cannot pass through to tenants. Review your lease's exclusion list and confirm that none of these costs appear on your reconciliation:

• Capital expenditures (unless your lease specifically permits them or requires amortization)
• Leasing commissions or tenant improvement costs
• Costs reimbursed by insurance proceeds or warranties
• Marketing, advertising, or promotional expenses
• Legal fees for lease disputes or tenant negotiations
• Mortgage payments, debt service, or ground rent
• Costs attributable to the landlord's own space or vacant space
• Depreciation or amortization of the building itself

Step 4: Validate the Proportionate Share Calculation

Your proportionate share is the single most impactful number on your reconciliation because it affects every expense line item. Verify:

• Your square footage matches the lease — not an estimate, not a rounded number.
• The total building or project area used in the denominator is correct and hasn't changed without lease authorization.
• Gross-up provisions are applied correctly if the building has vacancy. Variable expenses should be adjusted to reflect what they would be at full occupancy so that existing tenants are not subsidizing empty space.

Step 5: Review CAM Cap Compliance

If your lease includes a CAM cap, verify that it is being applied correctly:

• Is the correct base year amount being used?
• Is the cap applied as cumulative or non-cumulative, as your lease specifies?
• Are controllable and uncontrollable expenses separated correctly?
• Does the year-over-year increase stay within the cap percentage?

Step 6: Compare Estimates to Actuals

Compare the monthly CAM estimates you paid during the year against the actual reconciliation amount. Look for:

• Large true-up charges that suggest estimates were significantly too low
• Patterns of consistently high estimates that result in credits owed back to you — are those credits actually being applied?
• Whether the landlord is adjusting estimates each year to reflect prior actuals

Step 7: Exercise Your Audit Rights

Most commercial leases include audit rights that allow tenants to inspect the landlord's books and records. If your review reveals discrepancies:

1. Send a written request to the landlord or property manager, referencing the specific lease provision that grants audit rights.
2. Request supporting documentation — invoices, contracts, and vendor agreements for any charges you want to verify.
3. Note the deadline. Many leases require audit requests within 90 to 180 days of receiving the reconciliation. Missing this window may waive your rights for that year.

For a detailed walkthrough of the audit process, see our step-by-step CAM audit guide.

How LeaseGuard Helps

LeaseGuard automates the most time-consuming parts of this checklist. By uploading your lease agreement and CAM reconciliation statement, the platform cross-references the two documents to flag potential issues across excluded expenses, proportionate share calculations, CAM cap compliance, capital expense classification, and management fee accuracy — all in about 60 seconds. This gives you a prioritized list of items to investigate rather than having to review every line manually.

Key Takeaways

• Gather your lease, amendments, and at least two years of reconciliation statements before starting
• Verify your proportionate share first — errors there affect every expense category
• Cross-reference reconciliation line items against your lease's exclusion list
• Check CAM cap compliance if your lease includes annual increase limits
• Exercise your audit rights within the deadline specified in your lease