A lease audit verifies that lease charges, accounting treatment, and space allocations match the lease agreement and applicable accounting standards. Property owners, tenants, and finance teams typically run one before a renewal, during a sale, or after suspecting an overcharge. The first move is simple: compile a master lease inventory and pull the most recent reconciliation statement before anything else.
TL;DR:
- Compare every lease field against executed documents, rent rolls, accounting records, and building plans; flag area mismatches and equipment arrangements that may contain embedded leases.
- Request line item CAM details, vendor invoices, exclusions, and gross up calculations; reconcile each billed charge and check pro rata shares against rentable area.
- Under ASC Topic 842, document classification, component separation, commencement dates, discount rate rationale, and modification judgments supporting right of use assets and lease liabilities.
- Check audit notice and challenge deadlines, often 30 to 180 days after reconciliation; without formal rights, request a reconciliation review and negotiate payment protections.
Table of Contents
- The six audit assertions and how to check them in lease records
- Build and validate the master lease inventory
- Verify rent, escalations, CAM and reconciliations
- ASC 842 practical implications for classification and disclosures
- Audit rights, access, and internal controls that shorten the audit
- A practical process map and timeline for running a lease audit
- Standards and tools that reduce audit time
- What we prioritize in office and medical lease audits
- How we can help with your lease audit
- FAQ
- Sources
The six audit assertions and how to check them in lease records
Every lease audit tests the same six assertions auditors apply to any financial record. Mapping each one to a document or test keeps the review organized and defensible.
- Completeness: cross-check the master lease list against the rent roll to confirm no lease or charge is missing.
- Existence and occurrence: match invoices and journal entries to vendor statements to confirm the charge actually happened.
- Valuation and allocation: recalculate rent, CAM, CPI escalations, and gross-up figures against the lease formula.
- Cutoff: confirm each charge lands in the correct accounting period, especially around lease commencement or amendment dates.
- Rights and obligations: verify the named parties, renewal options, and termination rights match the executed lease.
- Presentation and disclosure: check that lease classification and required disclosures align with ASC Topic 842, which governs how lease identification, component allocation, and remeasurement get recorded.
Build and validate the master lease inventory
A reliable audit starts with a complete, validated inventory. Work through these steps in order.
- Capture lease ID, party names, space identifiers, rentable area, commencement and expiration dates, rent schedule, renewal options, and every amendment.
- Cross-check each field against the lease file, the rent roll, the accounting system, and current building plans.
- Flag any embedded leases, meaning equipment or service arrangements inside a broader contract that function like a lease.
- Separate nonlease components, such as maintenance or management services, from the lease payment itself.
- Note any mismatch between the lease’s stated square footage and what the building’s measured area shows, since this is a frequent source of billing disputes.
A detailed lease abstract organizes these fields in one place and makes the cross-check faster for anyone reviewing multiple properties.
Verify rent, escalations, CAM and reconciliations
Once the inventory is validated, the next step is confirming the dollar amounts actually billed match what the lease requires.
- Compare base rent and escalation clauses, fixed or CPI-tied, against both lease language and the most recent invoices.
- Request the full CAM or operating expense reconciliation, including vendor invoices, the expense pool breakdown, stated exclusions, and gross-up workings.
- Reconcile total billed CAM against the supporting invoices line by line.
- Confirm the pro rata share math uses the correct rentable area and tenant percentage.
- Watch for excluded items that sometimes slip into billed expenses, such as capital expenditures or owner overhead.
Reviewing pro rata share calculations separately often surfaces allocation errors that a quick CAM scan misses.
Pro Tip: Request the landlord’s expense pool detail by line item, not just the reconciliation summary; summaries hide the exclusions that cause the most disputes.
ASC 842 practical implications for classification and disclosures
Lease accounting under ASC Topic 842 introduces specific checkpoints that auditors test closely, and preparing documentation ahead of time speeds the process considerably.
- Determine whether the contract contains a lease at all, then separate lease components from nonlease services.
- Apply the classification test for finance versus operating treatment, which hinges on lease term, renewal options, and the present value of payments.
- Prepare evidence of the lease commencement date, the rationale behind the discount rate used, any initial direct costs, and documentation for modifications.
- Confirm the accounting treatment reflects the right-of-use asset and lease liability consistent with the classification outcome.
Auditors increasingly focus on how management documented the judgment calls behind lease term and option assumptions, since thorough documentation of modifications and estimates reduces the chance of an adjustment later.
Audit rights, access, and internal controls that shorten the audit
Most commercial leases include an audit clause, and knowing its terms before starting saves time on both sides.
- Review the clause for notice period, scope, who conducts the audit, the sample window, and the timing limit, often 30 to 180 days after the reconciliation statement is issued.
- Maintain change logs, vendor contracts, approval records, and reconciliation workflows so they are ready to hand over.
- Negotiate in advance what happens if errors are found: cost-sharing thresholds, reimbursement with interest, and the window for raising a challenge.
Even when a lease lacks a formal audit-rights clause, a reconciliation-focused review still works as a lower-cost first step, and tenants can negotiate escrow or pay-under-protest arrangements if a significant overcharge turns up. Termination clauses and other contractual rights deserve the same scrutiny; our guide to exiting a commercial lease covers how those obligations interact with audit findings.
A practical process map and timeline for running a lease audit
A lease audit moves faster when the workflow is sequenced and each stage has a clear output.
- Build the lease inventory and confirm it against the rent roll.
- Request records: executed leases and amendments, CAM schedules, vendor invoices and contracts, insurance policies, rent rolls, accounting entries, and prior reconciliations.
- Reconcile total billed amounts against the supporting documentation.
- Run sample testing on a subset of invoices and journal entries to confirm the pattern holds.
- Document findings in a written summary with supporting calculations.
- Negotiate resolution with the landlord or property manager, citing the specific lease clauses in question.
An estoppel certificate often surfaces discrepancies in stated rent or expiration dates before the formal audit even begins; our estoppel certificate guide explains what to verify there. Keep every request and response in a dated file to preserve a clear audit trail.
Standards and tools that reduce audit time
Consistent measurement and the right systems cut down on repeat disputes.
- BOMA’s floor measurement standards define how rentable area is calculated, and using the correct standard for the property type prevents recurring disagreements over CAM allocation.
- Lease management and accounting platforms with built-in abstraction, scheduled reconciliations, and audit trails cut down on manual entry errors.
- A third-party measurement firm or lease abstraction specialist is worth bringing in when the square footage dispute affects a meaningful share of the rent roll.
What we prioritize in office and medical lease audits
For office and medical tenants, we check pro rata share calculations, gross-up clauses, service contracts, and equipment leases first, since these generate the most recurring overcharges in our experience. We typically request the lease abstract, rent roll, and CAM schedules before anything else, which usually surfaces quick wins within the first review cycle. Medical suites in particular carry equipment leases that get misclassified as service agreements, a detail worth checking early.
— Jim
How we can help with your lease audit
We handle lease review and CAM reconciliation analysis, lease abstraction, and tenant or landlord representation for office and medical properties across the Charlotte MSA. Clients receive a findings report with recommended adjustments and support through the negotiation with the landlord or property manager.
If you need financing context once your audit findings are in hand, commercial mortgage rate guidance from our partner at Formosity Funding can help frame refinancing decisions. Reach out through our services page to request a consultation on your next lease review.
FAQ
What are the 5 stages of the audit process?
A typical lease audit moves through inventory, records request, reconciliation, sample testing, and documented findings with negotiation. Each stage produces a specific output that feeds the next, from a validated lease list to a written resolution with the landlord.
What not to say during an audit?
Avoid making firm claims about amounts owed before the reconciliation and sample testing are complete, since early statements can box in a negotiating position. Stick to requesting documentation and asking clarifying questions until the numbers are fully verified.
What is the 90% rule in leasing?
There is no single recognized “90% rule” in commercial leasing; the phrase is used inconsistently across markets and lease types. If you have encountered this term in a specific lease, check its definition section rather than assuming a standard meaning.
What are the 7 steps in the audit process?
Beyond the five core stages, a thorough process often adds a documentation-gathering step before the request and a follow-up monitoring step after resolution. Together these form a complete cycle from inventory through resolved findings and ongoing tracking.
How long does a typical commercial lease audit take?
Most lease audit clauses set a review window of 30 to 180 days after the reconciliation statement is issued, though the actual review can be faster with organized records. Complex portfolios with multiple embedded leases or recent amendments tend to run closer to the longer end of that window.
Sources
- BOMA Floor Measurement Standards | BOMA International
- Leases (Topic 842)
- What is a Lease Audit? | Auditing Your Commercial Lease
- Lease accounting requires new auditor judgments – Journal of Accountancy