Why this matters: According to CRE legal surveys, 68% of commercial tenants report discovering unexpected lease obligations after signing — averaging $47,000 in unbudgeted costs per lease. Most of these were discoverable in the original document.
What Is Commercial Lease Due Diligence?
Commercial lease due diligence is the systematic process of reviewing every clause, obligation, right, and restriction in a commercial lease before committing to it — whether you're a tenant signing directly, a buyer acquiring a property with existing leases, or an investor evaluating a portfolio.
The goal is simple: no surprises after you're locked in. A thorough review identifies hidden costs, unfavorable terms, assignment restrictions, demolition rights, and dozens of other provisions that can materially impact value.
How to Use This Checklist
Items are organized into six categories and rated by priority:
High = cost or legal exposure,
Med = operational or strategic impact,
Low = informational / administrative.
For buyers and investors, every High-priority item is a potential valuation adjustment. For tenants, every High item is a potential out-of-pocket cost you haven't budgeted.
📋 Section 1: Parties, Property & Lease Term (5 Items)
1
Landlord legal entity High
Verify the landlord entity matches the property title. Mismatches can create enforcement gaps or void the lease in certain jurisdictions.
2
Tenant entity and guarantor High
Who is actually liable? Check whether the lease is signed by the operating company, parent company, or an SPV — and who is on the hook if it defaults.
3
Premises description and rentable square footage High
Verify the legal description, suite number, and exact RSF. Errors here affect rent calculations, CAM proration, and pro-rata share throughout the lease.
4
Commencement date and rent commencement date Med
These are often different. Tenants may occupy earlier for buildout while rent begins later. Know both — especially relevant for acquisitions.
5
Lease expiration and any pending renewals High
For buyers: when does in-place cash flow expire? Has the tenant exercised any renewal options? A lease expiring in 6 months is a very different acquisition than one with 7 years remaining.
💰 Section 2: Financial Terms & Rent Structure (8 Items)
6
Base rent and rent schedule High
List out every year's rent — don't just check the current amount. Stepped increases, free rent periods, and abatement periods all affect cash flow projections.
7
Rent escalation mechanism High
Is it fixed-step (3%/yr), CPI-based, or market-reset? CPI clauses with no cap can increase rent dramatically in high-inflation years. Fixed-step escalations are more predictable for buyers.
8
CAM charges — structure and caps High
Is it NNN, modified gross, or full-service gross? If NNN: is there a CAM cap? Uncapped CAM charges can increase 8–15% per year without constraint.
9
CAM exclusions Med
What's excluded from CAM? Capital expenditures, management fees over a certain %, leasing commissions, and above-grade-floor costs should all be listed as exclusions in a well-negotiated lease.
10
Security deposit amount and conditions for return Med
How large is the deposit? Are there provisions to reduce it over time (a "burn-down" schedule)? When and under what conditions can the landlord draw on it?
11
Operating expense stops and base years High
In gross leases, the base year sets what the landlord absorbs. A 2019 base year with artificially low occupancy will expose tenants to massive catch-up expenses as the building fills.
12
Percentage rent clauses (retail) Med
Retail leases often include percentage rent above a "natural breakpoint." Understand what sales threshold triggers it and what the percentage rate is.
13
Tax and insurance obligations High
In NNN leases, the tenant pays their pro-rata share of property taxes and insurance. Verify what's included, how proration is calculated, and whether tax appeals are permitted.
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🔑 Section 3: Options, Rights & Flexibility (7 Items)
14
Renewal options — terms, notice windows, rent reset High
How many options, how long each, and at what rent? If rent resets to "fair market value," who determines FMV and is there a floor? Missed notice windows = forfeited options.
15
Expansion options and rights of first refusal Med
Does the tenant have the right to lease adjacent space? ROFR terms — timing, price basis, exercise window — need to be documented. These can materially affect a buyer's leasing strategy.
16
Termination rights — tenant and landlord High
Can either party terminate early? Under what conditions? Tenant kick-out clauses (triggered by sales performance) are common in retail. Landlord termination rights can accelerate vacancy.
17
Demolition and redevelopment clause High
Can the landlord terminate the lease to redevelop? What notice is required? What (if any) relocation allowance is provided? This clause can wipe out a tenant's entire business investment.
18
Assignment and subletting rights Med
Can the tenant assign or sublease without landlord consent? Is consent subject to a "reasonableness" standard? Restrictive assignment clauses trap tenants in leases they can't exit.
19
Co-tenancy clause (retail) Med
Does the lease permit rent reduction or termination if an anchor tenant leaves? Co-tenancy clauses can torpedo a property's cash flow if a major anchor vacates.
20
Exclusivity clause Med
Does the tenant have exclusive rights to their business category? For buyers: you may be contractually prohibited from leasing to competitors of existing tenants.
🏗️ Section 4: Use, Maintenance & Tenant Improvements (5 Items)
21
Permitted use clause — breadth and restrictions High
How narrowly is use defined? "General office use" is broad. "Insurance agency" is not. A narrow permitted use clause prevents tenants from pivoting their business without landlord consent.
22
Maintenance and repair obligations — who owns what Med
In NNN leases, HVAC maintenance is often the tenant's responsibility. Understand who is responsible for roof, structure, plumbing, electrical, and HVAC — and whether there are any landlord carve-outs.
23
Tenant improvement allowance — amount, timing, conditions High
How much TI is offered? When is it disbursed (upfront vs. reimbursement)? Are there conditions for forfeiture? TI disputes are among the most common CRE litigation sources.
24
Restoration obligations at lease end Med
Is the tenant required to restore the space to original condition? Removing specialized buildout can cost $50,000–$500,000+ in industrial or medical contexts.
25
Signage rights and restrictions Low
What building signage is the tenant entitled to? Are there restrictions on placement, size, or illumination? Missing signage rights can limit a tenant's brand visibility significantly.
⚖️ Section 5: Default, Insurance & Legal Provisions (7 Items)
26
Default notice and cure periods High
How many days does the tenant have to cure a monetary default? A non-monetary default? Short cure periods create aggressive landlord remedies. 5-day monetary / 30-day non-monetary is standard; anything shorter is a red flag.
27
Personal guarantee — scope and burn-down High
Is a personal guarantee required? For how long? Does it burn down as the lease performs? An unlimited full-term guarantee is a material risk to the guarantor's personal assets.
28
Insurance requirements — amounts and additional insured Med
What coverage types and limits are required? Are there specific carrier rating requirements? Is the landlord named as additional insured? Noncompliance can trigger default.
29
SNDA — subordination, non-disturbance, and attornment High
Without an SNDA, the lease may be wiped out in a foreclosure. A non-disturbance clause protects the tenant if the lender takes the property.
30
Force majeure and pandemic provisions Med
Post-2020, force majeure clauses have been heavily negotiated. Does the clause cover government-mandated closures? Is rent abatement available, or only a payment deferral?
31
Holdover provisions and penalties High
If the tenant stays past lease expiration, what do they pay? 125% of base rent? 200%? Holdover rates can be punishing — verify before assuming month-to-month is a safe fallback.
32
Dispute resolution — arbitration vs. litigation Low
Does the lease require binding arbitration? In which jurisdiction? Which party pays fees? Favorable dispute resolution clauses can save enormously if things go wrong.
🏢 Section 6: Acquisition-Specific Items (3 Items)
33
Estoppel certificates from all tenants High
Before closing, require executed estoppel certificates confirming the lease is in effect, rent amounts, and no outstanding landlord defaults. Estoppels are your primary defense against post-closing claims.
34
Lease amendments, addenda, and side letters High
Buyers often review only the original lease, missing critical amendments. Always request a complete lease file including all recorded and unrecorded modifications, letters, and memoranda.
35
Rent roll reconciliation — verify actual vs. stated High
Reconcile the rent roll against actual lease documents. Look for discrepancies in rent amounts, lease expirations, tenant names, and occupied square footage. Fraudulent rent rolls are a real risk in off-market deals.
⚠️ Don't skip the amendments. In 40% of acquisition disputes, the issue originated in a lease amendment that wasn't included in the buyer's initial review. Always request the full lease file — not just the original agreement.
Summary Table: 35-Item Due Diligence Checklist
| # |
Item |
Category |
Priority |
| 1–5 | Parties, premises, term dates | Lease Basics | High |
| 6–13 | Base rent, escalations, CAM, deposits, taxes | Financial | High |
| 14–20 | Renewals, expansion, termination, assignment | Options & Rights | High/Med |
| 21–25 | Permitted use, maintenance, TI, restoration | Use & Buildout | Med/High |
| 26–32 | Default, personal guarantee, insurance, SNDA | Legal | High/Med |
| 33–35 | Estoppels, amendments, rent roll reconciliation | Acquisition | High |
How LeaseAI Speeds Up Due Diligence
Manually checking all 35 items across a 10-lease portfolio takes 20–40 hours of attorney or analyst time. LeaseAI extracts the critical data — rent schedule, escalation type, renewal options, CAM structure, permitted use, holdover provisions, and more — from any PDF in 30 seconds per lease.
That doesn't replace a full legal review. But it means you can rapidly screen deals, identify red flags before committing to expensive due diligence, and have a structured abstract ready for your legal team on day one.
Run due diligence in 30 seconds per lease
Upload any commercial lease and get a structured 16-point abstract — rent, escalations, CAM, renewal options, and more. Free to try, $29 for the full report.
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