Commercial Lease Audit Checklist: Match Leases, Amendments and the Rent Roll
Audit commercial leases against amendments and the rent roll. Use a worked discrepancy register to check rent, dates, concessions and unresolved terms.
Commercial Lease Audit Checklist: Match Leases, Amendments and the Rent Roll
Audit a commercial lease by assembling the executed lease and related documents, extracting effective terms, and comparing them with the rent roll and billing period. Track each difference with a clause reference, financial effect, responsible reviewer and resolution. Keep missing documents and uncertain interpretations visible before using the results in underwriting.
Begin with the document stack
A tidy rent roll can conceal an old rent step, an unrecorded concession or a changed commencement date. The first question is whether the reviewer has the full stack: base lease, amendments, commencement agreements, assignments and any other documents relevant to the term being checked.
Record file names, parties, premises, execution status, effective dates and the provisions each document changes. A document dated later may address only parking or signage. Do not let an assistant replace every original term with whatever it finds in the most recent file.
Our commercial lease abstraction guide covers building the initial record. This checklist adds the acquisition comparison: does the rent roll and proposed model reflect the documented terms for the period being analyzed?
Work through the audit checklist
| Area | Compare | Leave open when |
|---|---|---|
| Tenant and premises | Legal tenant, suite, rentable area and any assignment | Names or areas conflict, or a referenced exhibit is missing |
| Dates | Commencement, rent commencement, expiry and effective amendment dates | A date depends on a missing commencement agreement or condition |
| Base rent | Schedule, unit basis, annual/monthly conversion and step dates | The roll uses an unexplained amount or a future step too early |
| Concessions | Applicable months, amounts, conditions and billing treatment | Eligibility or the period is not supported |
| Recoveries | Expense categories, base year, stops, caps, exclusions and responsibility | The model assumes reimbursements without the relevant language or expense basis |
| Options and notices | Exercise windows, conditions and evidence of exercise | The model assumes renewal or termination without support |
| Security and guarantees | Deposits, letters of credit and referenced guarantees | The document is missing, expired or not reconciled to the stated balance |
This is an acquisition review aid, not a legal opinion on enforceability. Have the responsible legal reviewer resolve ambiguous language and document priority. An AI-generated clause summary is a lead back to the document, not a substitute for reading it.
Worked example: a rent step and a free-rent month
The practice packet is fictional and intentionally simplified. It contains short synthetic lease excerpts rather than legal templates. The example uses September 2026 as the review month.
Suite A contains 1,000 rentable square feet. Its fictional amendment changes annual base rent to $25.20 per square foot from September 1. Monthly base rent is therefore 1,000 × $25.20 ÷ 12 = $2,100. The rent roll still shows $1,800. The difference is $300 for the month, or $3,600 on an annualized run-rate basis if the revised rent applies for the full year being modeled.
Suite B contains 1,500 square feet at $18 per square foot annually. Its $2,250 monthly rent matches the roll. Suite C contains 2,000 square feet at $15 annually, giving $2,500 in monthly contractual base rent. Its fictional amendment waives September base rent without changing the ongoing schedule.
| Suite | Rent-roll base rent | Reviewed contract base rent | September concession | September base-rent billing |
|---|---|---|---|---|
| A | $1,800 | $2,100 | $0 | $2,100 |
| B | $2,250 | $2,250 | $0 | $2,250 |
| C | $2,500 | $2,500 | $2,500 | $0 |
| Total | $6,550 | $6,850 | $2,500 | $4,350 |
Suite C's $2,500 contractual rent is not inherently wrong because September billing is zero. The fields answer different questions. The reviewed schedule shows $6,850 monthly contractual base rent and $4,350 September base-rent billing before any separately documented charges. The packet contains no collections evidence.
Download the commercial lease audit practice pack for the fictional excerpts, input rent roll, completed discrepancy register and blank checklist.
Turn every discrepancy into a review task
“Rent mismatch” is too vague to hand off. For Suite A, the register should identify the old roll value, the amendment clause, effective date, recalculation, proposed correction, reviewer and status. Save the original rent roll before editing the working model.
For Suite C, record the concession in its own schedule. Identify the month, any relevant condition and the billing field affected. Ask for evidence of actual collections separately. Do not invent a payment history from the rent schedule.
Use a distinct open item for missing recovery evidence. The exercise deliberately omits Suite B's expense reconciliation. That prevents the reviewer from approving its reimbursement income merely because base rent ties out.
Use AI for the comparison, then inspect the sources
Give the assistant the document inventory, the review month and the definitions of each rent-roll column. Ask it to return the exact file and clause for every proposed correction. Require a list of missing referenced documents and terms it cannot resolve.
A useful test instruction is: “Compare this rent roll with the supplied lease excerpts for September 2026. Separate contractual base rent, concessions, billed charges and collections. Calculate monthly rent from the stated area and annual rate where needed. Do not infer collections or recovery amounts. Identify every unsupported model input.”
Review both exceptions and material rows that received no warning. Then change the review month to October. In this exercise Suite C's September-only waiver should no longer reduce that month's base-rent billing. Ask the assistant to show why the result changed.
Carry the audit into underwriting
The accepted output is a revised schedule plus an unresolved-items register. It should identify the model version and explain how adjustments flow into revenue, cash flow and the memo. A corrected rent roll is insufficient if the executive summary still repeats the old figure.
The OCC's Commercial Real Estate Lending handbook discusses leases, property income and underwriting review in a bank-supervision context. Use it as background, while keeping the assumptions and professional reviews specific to the transaction.
The commercial underwriting Claude playbook gives an acquisition team a broader review structure. For a public walkthrough of the downstream document handoff, see the investment committee memo case study. To scope this around your own approved model and review process, book a conversation.
Frequently asked questions
How is a lease audit different from a lease abstract?
An abstract summarizes a lease and its related documents. An acquisition lease audit compares those documented terms with the rent roll, billing and underwriting assumptions, records discrepancies, and assigns unresolved items for review.
Does the latest amendment always replace the original lease?
An amendment may change specific provisions while leaving others in effect. Review its scope, execution status and effective date with the full document set. Ambiguous precedence or enforceability belongs with the appropriate legal reviewer.
Should free rent reduce the base-rent field?
Keep contractual base rent and any concession schedule separately identifiable. The amount billed in a concession month may differ from the base-rent schedule. Apply the treatment required by the model and accounting basis without deducting the same concession twice.
Can AI approve the final lease audit?
AI can prepare a clause-level comparison and flag missing or conflicting documents. A designated reviewer must validate material terms and calculations. Legal interpretations, tenant disputes and acquisition decisions remain with the responsible professionals.
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