A commercial lease is a financial instrument. Every clause has a dollar impact — some immediately, some years down the road. A thorough commercial lease review surfaces those impacts before you sign, before you close a deal, or before you abstract a portfolio.
Here is what to check, why each area matters, and how the review process works with AI assistance.
Why Commercial Lease Review Matters
Most CRE professionals know that lease terms drive portfolio performance. But the specific provisions that create risk are often buried in pages 40–80 of a document that reads like a legal contract — because it is one.
Without systematic review, teams miss:
- CAM exposure. An NNN lease with no cap on controllable expenses can increase operating cost obligations significantly over a 5–10 year term.
- Renewal notice windows. A 180-day written notice requirement missed by two weeks can mean losing renewal leverage and negotiating from a holdover position.
- Personal guarantee scope. A guarantee on a 10-year lease that survives assignment can follow a principal for the full term.
- Audit rights. Without a contractual right to audit landlord CAM statements, tenants lose the ability to recover overcharges that are common in NNN portfolios.
The goal of lease review is to surface these issues — whether you are the tenant evaluating before signing, the landlord reviewing portfolio risk, or the investor performing due diligence on an acquisition.
The 9 Areas Every Commercial Lease Review Must Cover
1. Rent Structure and Escalation
What to check:
- Base rent per square foot (annual and monthly)
- Free rent period and conditions
- Escalation type: fixed percentage, CPI-linked, or market reset
- Escalation schedule: annual, biennial, or at option periods
- Percentage rent provisions (for retail leases): breakpoint and rate
- Security deposit amount and return conditions
Why it matters: A 3% annual escalation over a 10-year lease compounds significantly. A CPI-linked escalation with no cap has unlimited upside risk in inflationary periods. Security deposit conditions determine whether you actually get money back.
2. Operating Expense Structure (NNN vs. Gross)
What to check:
- Lease type: triple net (NNN), gross, or modified gross
- Pro rata share calculation method
- What is included in CAM and operating expenses
- What is excluded (capital expenditures, management fee above X%, landlord income taxes)
- CAM cap: controllable-only or all expenses; cap percentage; cumulative or non-cumulative
- Base year or expense stop
- Gross-up provision: percentage and occupancy threshold
- Management fee cap (typically 3–5% of operating expenses)
- Reconciliation frequency and deadlines
Why it matters: The difference between a capped and uncapped NNN structure can be substantial over a 10-year term. Gross-up provisions affect your share of expenses in partially-occupied buildings. Missing a reconciliation deadline can forfeit your right to dispute charges.
3. Critical Dates
What to check:
- Lease commencement date and conditions
- Rent commencement date (may differ from commencement)
- Lease expiration date
- Renewal option exercise deadline (often 180–365 days before expiration)
- Early termination option trigger dates
- Tenant improvement completion deadline and consequences
- Insurance certificate renewal dates
- Audit rights exercise deadline (typically 60–180 days after statement receipt)
Why it matters: Missing a renewal notice deadline can eliminate your option to renew. Missing an audit rights deadline can forfeit your right to dispute CAM overcharges. These dates are buried in the document but have immediate financial consequences.
4. Renewal and Termination Options
What to check:
- Number and length of renewal options
- Renewal rent: fixed, fair market value, or CPI-adjusted
- Whether renewal rent has a floor (not less than in-place rent)
- Renewal notice requirements: written notice, specific method (certified mail)
- Early termination: conditions, effective date, fee structure
- Termination fee calculation: typically 6 months rent plus unamortized TI and leasing commissions
- Whether termination rights are mutual or one-sided
Why it matters: A fair market value renewal with no floor means rent could reset downward — good for tenants, less predictable for landlords. A termination fee that includes unamortized landlord costs needs to be modeled against the value of the option.
5. Assignment and Subletting Rights
What to check:
- Assignment allowed? Conditions (landlord consent, reasonableness standard)
- Subletting allowed? Conditions
- Permitted transferees: which related entities can be assigned to without consent
- Recapture rights: can the landlord reclaim the space if you try to sublease?
- Profit sharing: does the landlord participate in sublease rent above your base rent?
Why it matters: For growing businesses, assignment rights determine whether you can transfer the lease in an acquisition or merger without landlord approval. Recapture rights can eliminate the value of sublease rights in practice.
6. Personal Guarantee
What to check:
- Does a personal guarantee exist?
- Is it limited (capped at X months rent) or unlimited?
- Does it survive assignment?
- Are there burn-off provisions (guarantee reduces after Year X if no defaults)?
- Who is the guarantor?
Why it matters: A personal guarantee on a 10-year NNN lease represents a substantial contingent liability. The scope of the guarantee — limited vs. unlimited, survives assignment vs. releases on assignment — determines actual exposure.
7. Use Restrictions and Exclusivity
What to check:
- Permitted use clause: narrow (specifically named business) or broad (retail/office use)
- Prohibited uses: what you cannot do regardless of your permitted use
- Co-tenancy clause: does your rent reduce or termination right trigger if anchor tenants leave?
- Exclusivity: does the landlord restrict competing tenants in the building?
- Radius restriction: are you prohibited from operating a competing business nearby?
Why it matters: A narrow permitted use clause restricts your ability to change business focus within the space. Co-tenancy provisions are valuable for retail tenants; losing an anchor can reduce your sales and trigger a rent reduction or termination right.
8. Landlord Access and Relocation Rights
What to check:
- Landlord right to enter: notice requirements and permitted purposes
- Relocation clause: can the landlord move you to comparable space?
- Relocation conditions: what constitutes "comparable," how much notice, who pays moving costs
- Construction access rights during lease term
Why it matters: A relocation clause without adequate conditions gives a landlord significant flexibility to move you — a material risk for tenants with physical buildout investments. Construction access rights without reasonable notice and damage controls create operational disruption risk.
9. Red Flag Provisions
The following provisions represent elevated financial risk and should be flagged explicitly in any lease review:
| Provision | Risk |
|---|---|
| Uncapped CAM charges (controllable and uncontrollable) | Unlimited operating expense exposure |
| No tenant audit rights | Cannot verify landlord's CAM statements |
| Personal guarantee — unlimited | Full personal liability on all lease obligations |
| Fair market renewal with no floor | Rent reset uncertainty |
| Landlord-only termination right | Operational instability risk |
| Relocation clause with broad landlord discretion | Business disruption risk |
| Assignment requires landlord consent without reasonableness standard | Restricts future transactions |
| Management fee above 5% with no cap | Above-market administrative cost exposure |
AI-Assisted Commercial Lease Review
Manual commercial lease review takes 2–6 hours per lease depending on complexity. For a portfolio of 50 leases in a due diligence process, that is 100–300 hours of professional time.
AI tools accelerate the process in two ways:
Extraction: AI extracts all 9 categories above as structured fields in under 3 minutes. No reading 80 pages to find the CAM cap on page 47. Every field is labeled and available for review.
Automated flagging: Purpose-built tools like Lextract check every extraction against 20 red flag rules. Uncapped CAM, missing audit rights, unlimited personal guarantees — each is flagged with the specific lease language that triggered it. You review the flag, not the full document.
What AI does not replace: Attorney judgment on the negotiability of provisions, market context for whether terms are standard or unusual, and transaction-specific strategy. AI extraction and flagging are the first pass; professional review of flagged provisions is the second.
Workflow with AI:
- Upload lease PDF — under 3 minutes to full 126-field extraction
- Review red flags (typically 3–8 per standard commercial lease) — 10–15 minutes
- Verify high-stakes fields: rent, critical dates, options — 10–15 minutes
- Export structured data to property management system or due diligence report
Total workflow: 25–35 minutes per lease vs. 2–6 hours manual.
For a comparison of AI lease review tools, see: Best AI Lease Abstraction Tools 2026.