The short answer is: it depends on your CAM spend, lease complexity, and how long it has been since anyone reviewed the math. For most commercial tenants paying more than $10,000 per year in CAM, the case for an audit is straightforward. The question is not whether to audit but which type of audit makes sense for your situation.
40%of commercial CAM reconciliations contain material billing errors that tenants could dispute with documentation
Some situations make an audit essentially mandatory. If any of these apply to you, do not skip this.
At this level, the cost of a professional audit, whether software or a firm, is trivially small relative to what errors could cost you compounded over a multi-year lease. Even a 5 percent overcharge on $10,000 in annual CAM is $500 per year. Over a 10-year lease, that is $5,000. At $50,000 in annual CAM, a 5 percent error costs $25,000 over that same period.
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Run the audit before you decide whether this applies to your lease.
Your lease has complex provisions. A lease with a CAM cap, controllable expense subcap, management fee cap, base year adjustment, gross-up clause, and an explicit exclusion list has many moving parts. Each one is a potential error point. A simple lease with flat-fee CAM is much harder to overbill.
Your CAM charges increased more than 8 percent year-over-year. An 8 percent jump in CAM deserves scrutiny even when the lease has no cap. When it exceeds your cap provision, it is almost certainly a violation. Request the backup documentation and run the numbers.
You have never audited before. If you have been in a space for 3 or more years and never reviewed a reconciliation, the probability that errors have accumulated is significant. A prior-year lookback audit covers up to 3 to 4 years at once. The cumulative recovery potential is often larger than any single-year audit would suggest.
You are approaching lease expiration or renewal. The final year of a lease is the last opportunity to recover compounding overpayments before the period is outside the lookback window. Landlords also know that tenants leaving a space are unlikely to audit. That creates a predictable pattern of looser reconciliation accuracy in terminal years.
You just took over lease administration. If your company acquired another company, inherited a portfolio, or promoted someone new into the role, prior years likely have not been audited. Start with a multi-year lookback before the opportunity closes.
When You Might Not Need One
Not every commercial tenant is a strong candidate for a CAM audit. Skip it if:
You have a gross lease. Gross leases require the landlord to pay operating expenses from the base rent. You do not receive a CAM reconciliation because you do not owe variable CAM charges. If your lease says "all-inclusive" or specifically states the landlord is responsible for operating expenses, a CAM audit is not applicable.
Very little time remains on your lease. If you have 6 months or fewer left and no renewal planned, the window for recovering prior-year overpayments may be closing faster than an audit could complete. Run a quick review of the most recent reconciliation, but a multi-year engagement may not be worth the time investment.
Your lease has a flat fixed CAM amount with no reconciliation. Some leases include a fixed monthly CAM amount that never changes and requires no annual reconciliation. These are generally safer from an overcharge standpoint, though you should still verify the fixed amount was calculated correctly at lease inception.
Your CAM is very low in absolute terms. If your annual CAM is under $3,000 and the lease is straightforward, the time cost of running an audit may exceed the likely recovery amount. Use judgment here, but do not dismiss the exercise entirely. Systemic errors can hide in small numbers.
The DIY Question
Can you audit CAM charges yourself? Technically yes, but practically it depends on what you bring to the table.
Self-auditing requires you to understand at least the following: how pro-rata share is calculated under your lease, what the gross-up clause requires, whether your lease caps controllable expenses separately from total CAM, which expense categories are explicitly excluded, how management fees are capped and on what base, and how to read a commercial operating expense ledger.
Most small business owners do not have this background. Their time is worth more applied elsewhere, and the risk of missing a valid claim is real. Lease administrators at larger companies who manage multiple locations often do have this expertise, but they are also managing many other priorities simultaneously.
The other issue with self-auditing is documentation. Knowing something looks wrong is not the same as being able to prove it with a written dispute letter draft that cites specific lease provisions and quantifies the overcharge precisely. A poorly documented dispute is much easier for a landlord to dismiss.
Decision Framework
Use this table to match your situation to the right approach.
Annual CAM
Lease Complexity
Locations
Years Since Last Audit
Recommended Approach
Under $5,000
Low
1
1-2 years
Self-review or skip
$5,000 to $15,000
Low to moderate
1-3
1-3 years
Software audit ($199)
$15,000 to $50,000
Moderate
1-5
1-3 years
Software audit or CPA
$15,000 to $50,000
High (multiple provisions)
1-5
3+ years
Software audit + professional review
Over $50,000
Any
1+
Any
Professional firm or contingency auditor
Any amount
Any
6+
Any
In-house lease admin + software
Any amount
High
Any
Never audited
Software + lookback audit
"High complexity" means any combination of: CAM cap, controllable expense subcap, base year provision, gross-up clause, anchor exclusion language, specific management fee cap with defined base, and more than five explicit exclusion categories.
The Cost-Benefit Math
Traditional CAM audit firms charge $2,000 to $5,000 upfront plus a 25 to 33 percent contingency on recoveries. That pricing model makes economic sense only when the likely recovery is large enough to cover both the upfront fee and the contingency. For a $5,000 upfront fee to make sense, you need to reasonably expect recovery of at least $15,000 to $25,000 in overcharges.
CAMAudit costs $199 for a single audit or $499 for three. No contingency. No percentage of recovery.
The ROI calculation is simple. If 40 percent of reconciliations contain billing errors and your annual CAM is $20,000, there is a meaningful probability you are overpaying. The expected value of running an audit at $199 is positive across almost any reasonable set of assumptions. Even if your reconciliation comes back clean, you have documentation proving it, which has value at lease renewal.
Types of Auditors: What Each One Does
CAM audit software (CAMAudit). Automated review of your lease and reconciliation statement against 13 detection rules. Runs in under 5 minutes. Flags potential overcharges with specific lease citations. Generates a dispute letter draft. Cost: $199 per audit. Best for tenants who want fast, accurate flagging and can handle the follow-up themselves or with their attorney.
Contingency audit firm. Professional firm that reviews your reconciliation in exchange for a percentage of recoveries, typically 25 to 33 percent. Usually requires a minimum likely recovery threshold before they will take the engagement. Best for large CAM budgets where the absolute dollar recovery justifies the contingency fee.
CPA with commercial lease experience. A CPA who understands operating expense accounting can audit your reconciliation and provide a professional opinion letter useful for formal dispute proceedings. Charges hourly, typically $150 to $350 per hour. Best when you anticipate litigation or need professional documentation.
In-house lease administrator. A dedicated lease administrator on staff who reviews reconciliations as part of their role. Best for portfolios of 6 or more locations where the salary cost is amortized across many audits per year. Often uses software tools to scale the review.
Real estate attorney review. Not a substitute for an audit but a follow-on step after an audit finds overcharges. An attorney interprets the lease, assesses the strength of the dispute, and may draft or review the dispute letter draft. Necessary if the landlord disputes your findings.
“Most tenants I talk to think a CAM audit is something only large corporations do with armies of lease administrators. That is exactly backward. Large companies with dedicated lease admin teams audit every year as a matter of course. Small tenants are the ones most likely to have been overbilled for years without knowing it.”
Angel Campa, Founder of CAMAudit, 2026
How to Start
If you have decided an audit makes sense, here is the practical starting point:
Pull your most recent CAM reconciliation statement.
Pull your executed lease, including all amendments and addenda.
Identify your dispute window (check the audit rights or dispute clause).
Upload both to CAMAudit or begin a manual review against your lease provisions.
If errors are found, issue a written dispute letter draft before your window closes.
The full process, start to finish, typically takes less than a week for a single location. Multi-location portfolios take longer, but the per-location marginal effort drops significantly once you have a baseline process.
